Patient 1 – A 26-year-old woman presents to her primary care physician for an annual exam. She currently does not have any acute concerns and says her health has been generally well. Medical history is significant for asthma, which is managed with an albuterol inhaler. Her last pap smear was unremarkable. She is currently sexually active with one male and consistently uses condoms. She occasionally smokes marijuana and drinks wine once per week. Her mother recently passed away from advanced ovarian cancer. Her sister is 37-years-old and was recently diagnosed with breast cancer and ovarian cancer. Physical examination is remarkable for a mildly anxious woman.
Patient 2 – A 27-year-old woman presents to her primary care physician for an annual exam. She says that she would like to be screened for breast cancer since two of her close friends were recently diagnosed. She noticed she has a small and mobile mass on her left breast, which increases in size and becomes tender around her time of menses. Family history is remarkable for hypertension in the father. The physical exam is significant for a small, well-defined, and mobile mass on her left breast that is not tender to palpation.
Which of the following is the best next step in management for patient 1 and 2?
Q52
A 25-year-old nulligravid female presents to clinic complaining of abnormal vaginal discharge and vaginal pruritis. The patient's past medical history is unremarkable and she does not take any medications. She is sexually active with 3 male partners and does not use condoms. Pelvic examination is notable for a thick, odorless, white discharge. There is marked erythema and edema of the vulva. Vaginal pH is normal. Microscopic viewing of the discharge shows pseudohyphae and white blood cells. Which of the following is the most appropriate treatment plan?
Q53
A 36-year-old primigravida presents to her obstetrician for antenatal care. She is at 24 weeks of gestation and does not have any current complaint except for occasional leg cramps. She does not smoke or drink alcohol. Family history is irrelevant. Her temperature is 36.9°C (98.42°F), blood pressure is 100/60 mm Hg, and pulse of 95/minute. Her body mass index is 21 kg/m² (46 pounds/m²). Physical examination reveals a palpable uterus above the umbilicus with no other abnormalities. Which of the following screening tests is suitable for this patient?
Q54
A 37-year-old primigravid woman comes to the physician at 13 weeks' gestation for a prenatal visit. She feels well. Her only medication is folic acid. Vital signs are within normal limits. Pelvic examination shows a uterus consistent in size with a 13-week gestation. Ultrasonography shows a nuchal translucency above the 99th percentile. Maternal serum pregnancy-associated plasma protein A is decreased and human chorionic gonadotropin concentrations are elevated to 2 times the median level. Which of the following is most likely to confirm the diagnosis?
Q55
A 29-year-old woman, gravida 2, para 1, at 17 weeks' gestation comes to the physician for a routine prenatal examination. A prenatal ultrasound at 10 weeks' gestation showed no abnormalities. Serum studies at 16 weeks' gestation showed an abnormally elevated α-fetoprotein level and normal beta human chorionic gonadotropin and estriol levels. After genetic counseling, the patient decides to continue with the pregnancy without any diagnostic testing. The remainder of her pregnancy is uncomplicated and she delivers a boy at 38 weeks' gestation. Analysis of the infant's leukocytes shows a 46, XY karyotype. Which of the following is the most likely cause for the abnormal second-trimester test results?
Q56
A 28-year-old woman presents with a malodorous vaginal discharge and itchiness that have lasted for 15 days. She reports that the smell of the discharge is worse after intercourse and is accompanied by a whitish-gray fluid. She has no significant past medical or gynecological history. She is in a stable monogamous relationship and has never been pregnant. She is diagnosed with bacterial vaginosis and prescribed an antimicrobial agent. Which of the following diagnostic features is consistent with this patient’s condition?
Q57
A 31-year-old female presents to her gynecologist for a routine Pap smear. Her last Pap smear was three years ago and was normal. On the current Pap smear, she is found to have atypical squamous cells of unknown significance (ASCUS). Reflex HPV testing is positive. What is the best next step?
Q58
A 23-year-old woman comes to the physician because of vaginal discharge for 3 days. She has been sexually active with three male partners over the past year and uses condoms inconsistently. Her only medication is an oral contraceptive. Physical exam shows thin grayish-white vaginal discharge. There is no erythema of the vaginal mucosa. The pH of the discharge is 5.9. Adding potassium hydroxide (KOH) to a mount containing vaginal discharge produces a fishy odor. Further evaluation of this patient's vaginal discharge is most likely to show which of the following findings?
Q59
A 27-year-old woman visits her family physician complaining of the recent onset of an unpleasant fish-like vaginal odor that has started to affect her sexual life. She was recently treated for traveler’s diarrhea after a trip to Thailand. External genitalia appear normal on pelvic examination, speculoscopy shows a gray, thin, homogenous, and malodorous vaginal discharge. Cervical mobilization is painless and no adnexal masses are identified. A sample of the vaginal discharge is taken for saline wet mount examination. Which of the following characteristics is most likely to be present in the microscopic evaluation of the sample?
Q60
A 28-year-old G1P0 woman at 16 weeks estimated gestational age presents for prenatal care. Routine prenatal screening tests are performed and reveal a positive HIV antibody test. The patient is extremely concerned about the possible transmission of HIV to her baby and wants to have the baby tested as soon as possible after delivery. Which of the following would be the most appropriate diagnostic test to address this patient’s concern?
Screening tests US Medical PG Practice Questions and MCQs
Question 51: Patient 1 – A 26-year-old woman presents to her primary care physician for an annual exam. She currently does not have any acute concerns and says her health has been generally well. Medical history is significant for asthma, which is managed with an albuterol inhaler. Her last pap smear was unremarkable. She is currently sexually active with one male and consistently uses condoms. She occasionally smokes marijuana and drinks wine once per week. Her mother recently passed away from advanced ovarian cancer. Her sister is 37-years-old and was recently diagnosed with breast cancer and ovarian cancer. Physical examination is remarkable for a mildly anxious woman.
Patient 2 – A 27-year-old woman presents to her primary care physician for an annual exam. She says that she would like to be screened for breast cancer since two of her close friends were recently diagnosed. She noticed she has a small and mobile mass on her left breast, which increases in size and becomes tender around her time of menses. Family history is remarkable for hypertension in the father. The physical exam is significant for a small, well-defined, and mobile mass on her left breast that is not tender to palpation.
Which of the following is the best next step in management for patient 1 and 2?
A. Patient 1 – Breast ultrasound. Patient 2 – Return in 3 months for a clinical breast exam
B. Patient 1 – Reassurance. Patient 2 – Breast ultrasound
D. Patient 1 – BRCA testing. Patient 2 – Breast ultrasound (Correct Answer)
E. Patient 1 – Breast and ovarian ultrasound. Patient 2 – Mammography
Explanation: ***Patient 1 – BRCA testing. Patient 2 – Breast ultrasound***
- Patient 1 has a strong family history of early-onset **breast and ovarian cancer** (**mother and sister**), suggesting a high probability of an inherited genetic mutation, such as **BRCA1/2**, which warrants genetic testing.
- Patient 2 presents with a **small, mobile, well-defined breast mass** that is likely benign, and a **breast ultrasound** is the appropriate initial imaging for further characterization in a young woman.
*Patient 1 – Breast ultrasound. Patient 2 – Return in 3 months for a clinical breast exam*
- Patient 1's primary concern is genetic predisposition due to family history, an **ultrasound** is not the initial or primary screening method for future cancer risk.
- Patient 2 has a palpable mass; waiting 3 months for a **clinical breast exam** without initial imaging (ultrasound) is not appropriate for evaluating a new breast lump.
*Patient 1 – Reassurance. Patient 2 – Breast ultrasound*
- Patient 1's family history of **early-onset breast and ovarian cancer** is a significant risk factor; therefore, simple **reassurance** without further investigation is inappropriate.
- While a **breast ultrasound** is appropriate for Patient 2, the recommendation for Patient 1 is incorrect.
*Patient 1 – CA-125 testing. Patient 2 – BRCA testing*
- **CA-125** is a tumor marker primarily used for monitoring ovarian cancer treatment or recurrence, not for initial screening in asymptomatic individuals, especially in a young woman with no active symptoms.
- **BRCA testing** is indicated for Patient 1 due to family history, but not for Patient 2 who has a likely benign breast mass and no significant family history.
*Patient 1 – Breast and ovarian ultrasound. Patient 2 – Mammography*
- Regular **breast and ovarian ultrasounds** are not recommended as primary screening tools for genetic risk in asymptomatic high-risk individuals like Patient 1.
- **Mammography** is less sensitive in young women (under 30) due to higher breast tissue density, making **ultrasound** the preferred initial imaging for Patient 2.
Question 52: A 25-year-old nulligravid female presents to clinic complaining of abnormal vaginal discharge and vaginal pruritis. The patient's past medical history is unremarkable and she does not take any medications. She is sexually active with 3 male partners and does not use condoms. Pelvic examination is notable for a thick, odorless, white discharge. There is marked erythema and edema of the vulva. Vaginal pH is normal. Microscopic viewing of the discharge shows pseudohyphae and white blood cells. Which of the following is the most appropriate treatment plan?
A. Oral fluconazole for the patient (Correct Answer)
B. Topical metronidazole
C. Oral clindamycin for the patient
D. Oral fluconazole for the patient and her partner
E. Oral clindamycin for the patient and her partner
Explanation: ***Oral fluconazole for the patient***
- The symptoms of **thick, odorless, white discharge**, **marked vulvar erythema and edema**, **normal vaginal pH**, and most importantly, the presence of **pseudohyphae** on microscopic examination are all characteristic findings of **vulvovaginal candidiasis**.
- **Oral fluconazole** is a first-line treatment for uncomplicated vulvovaginal candidiasis, effectively targeting the fungal overgrowth.
*Topical metronidazole*
- **Metronidazole** is an antibiotic primarily used to treat **bacterial vaginosis** and **trichomoniasis**.
- Microscopic examination showing **pseudohyphae** rules out bacterial vaginosis and trichomoniasis, making metronidazole an ineffective treatment for candidiasis.
*Oral clindamycin for the patient*
- **Clindamycin** is an antibiotic effective against certain bacterial infections, including **bacterial vaginosis**.
- It is not effective against **fungal infections** like candidiasis.
*Oral fluconazole for the patient and her partner*
- While **oral fluconazole** is appropriate for the patient, routine treatment of male sexual partners for **vulvovaginal candidiasis** is **not typically recommended** unless the partner also exhibits symptoms of balanitis or the patient experiences recurrent infections.
- **Candidiasis is not considered a sexually transmitted infection (STI)** because it often occurs in sexually inactive women and successful treatment does not depend on partner treatment.
*Oral clindamycin for the patient and her partner*
- **Clindamycin** is not effective against **fungal infections**.
- Furthermore, routine partner treatment for vaginal candidiasis with any medication is generally **not indicated**.
Question 53: A 36-year-old primigravida presents to her obstetrician for antenatal care. She is at 24 weeks of gestation and does not have any current complaint except for occasional leg cramps. She does not smoke or drink alcohol. Family history is irrelevant. Her temperature is 36.9°C (98.42°F), blood pressure is 100/60 mm Hg, and pulse of 95/minute. Her body mass index is 21 kg/m² (46 pounds/m²). Physical examination reveals a palpable uterus above the umbilicus with no other abnormalities. Which of the following screening tests is suitable for this patient?
A. Fasting and random glucose testing for gestational diabetes mellitus
B. HbA1C for gestational diabetes mellitus
C. Oral glucose tolerance test for gestational diabetes mellitus (Correct Answer)
D. Complete blood count for iron deficiency anemia
E. Wet mount microscopy of vaginal secretions for bacterial vaginosis
Explanation: ***Oral glucose tolerance test for gestational diabetes mellitus***
- The **oral glucose tolerance test (OGTT)**, typically performed between **24 and 28 weeks of gestation**, is the gold standard for screening and diagnosing **gestational diabetes mellitus (GDM)**. This patient is at 24 weeks, making it the appropriate time for this screening.
- GDM, if undiagnosed and untreated, can lead to significant maternal and fetal complications, including **macrosomia**, **preeclampsia**, **neonatal hypoglycemia**, and **shoulder dystocia**.
*Fasting and random glucose testing for gestational diabetes mellitus*
- While **fasting** or **random glucose** values can indicate hyperglycemia, they are **not sensitive or specific enough** on their own to reliably screen for or diagnose GDM.
- A single elevated reading might prompt further testing, but it's not the primary or most suitable screening method.
*HbA1C for gestational diabetes mellitus*
- **HbA1c** reflects **average blood glucose levels over the past 2-3 months** and is primarily used for diagnosing and monitoring **pre-existing diabetes** or assessing glycemic control in non-pregnant individuals.
- Due to the **physiological changes in red blood cell turnover during pregnancy** and the acute onset nature of GDM, HbA1c is **not recommended** as a first-line screening tool for GDM.
*Complete blood count for iron deficiency anemia*
- While **complete blood count (CBC)** is a routine prenatal screening test to check for **anemia**, it is typically done earlier in pregnancy and again in the third trimester. There are no specific symptoms in this patient that strongly suggest immediate concern for anemia beyond routine.
- The question specifically asks for the "most suitable" screening test at this gestational age, and the **GDM screening** takes precedence given the timing.
*Wet mount microscopy of vaginal secretions for bacterial vaginosis*
- There are **no symptoms of vaginal infection** (e.g., unusual discharge, itching, odor) mentioned in the patient's presentation that would warrant immediate screening for **bacterial vaginosis (BV)** at this visit.
- While BV can be associated with adverse pregnancy outcomes, routine asymptomatic screening by wet mount is **not universally recommended** at 24 weeks gestation without other indications.
Question 54: A 37-year-old primigravid woman comes to the physician at 13 weeks' gestation for a prenatal visit. She feels well. Her only medication is folic acid. Vital signs are within normal limits. Pelvic examination shows a uterus consistent in size with a 13-week gestation. Ultrasonography shows a nuchal translucency above the 99th percentile. Maternal serum pregnancy-associated plasma protein A is decreased and human chorionic gonadotropin concentrations are elevated to 2 times the median level. Which of the following is most likely to confirm the diagnosis?
A. Chorionic villus sampling (Correct Answer)
B. Cell-free DNA testing
C. Triple screening test
D. Amniocentesis
E. Quadruple marker test
Explanation: ***Chorionic villus sampling***
- This procedure can be performed between **10 to 13 weeks of gestation** to obtain fetal cells for genetic analysis, which is within the patient's gestational age.
- It provides a definitive diagnosis of **chromosomal abnormalities** by directly sampling placental tissue, which shares the same genetic material as the fetus.
*Cell-free DNA testing*
- While it has high sensitivity and specificity for various **aneuploidies**, it is a **screening test**, not a diagnostic one.
- An abnormal result from cell-free DNA testing still requires **confirmatory diagnostic testing** such as CVS or amniocentesis.
*Triple screening test*
- This test is typically performed between **15 and 20 weeks of gestation**, which is too late to confirm the findings presented at 13 weeks gestation.
- It measures **AFP, hCG, and unconjugated estriol**, and an abnormal result would indicate a need for further diagnostic testing.
*Amniocentesis*
- This procedure is generally performed later in pregnancy, typically between **15 and 20 weeks gestation**, so it would require waiting several more weeks.
- While it provides definitive genetic results, **chorionic villus sampling is preferred at 13 weeks** due to earlier diagnostic potential.
*Quadruple marker test*
- This test is also performed between **15 and 20 weeks of gestation** and measures **AFP, hCG, unconjugated estriol, and inhibin A**.
- It is a **screening test**, similar to the triple screen, and does not provide a definitive diagnosis, requiring further confirmatory testing if abnormal.
Question 55: A 29-year-old woman, gravida 2, para 1, at 17 weeks' gestation comes to the physician for a routine prenatal examination. A prenatal ultrasound at 10 weeks' gestation showed no abnormalities. Serum studies at 16 weeks' gestation showed an abnormally elevated α-fetoprotein level and normal beta human chorionic gonadotropin and estriol levels. After genetic counseling, the patient decides to continue with the pregnancy without any diagnostic testing. The remainder of her pregnancy is uncomplicated and she delivers a boy at 38 weeks' gestation. Analysis of the infant's leukocytes shows a 46, XY karyotype. Which of the following is the most likely cause for the abnormal second-trimester test results?
A. Spina bifida occulta
B. Maternal hypothyroidism
C. Robertsonian translocation
D. Underestimation of gestational age (Correct Answer)
E. Gestational trophoblastic disease
Explanation: ***Underestimation of gestational age***
- An elevated **maternal serum α-fetoprotein (MSAFP)** with otherwise normal markers (hCG, estriol) in a term infant suggests an error in **gestational age calculation**. Higher MSAFP levels are expected later in gestation, so underestimating the age would falsely indicate an elevated level.
- The **normal karyotype** of the infant and the absence of any congenital anomalies preclude other structural or chromosomal causes for the MSAFP elevation.
*Spina bifida occulta*
- **Spina bifida occulta** is a mild form of neural tube defect where the spinal cord and nerves are usually unaffected, and the defect is often covered by skin, thus **not typically associated with elevated MSAFP**.
- Open neural tube defects (e.g., anencephaly, spina bifida aperta) that expose fetal CSF to maternal circulation are associated with elevated MSAFP, but these would likely have been detected on the 10-week ultrasound or subsequent clinical examination, and usually result in more significant clinical findings than described.
*Maternal hypothyroidism*
- **Maternal hypothyroidism** can affect fetal development but is **not directly associated with elevated MSAFP levels**.
- While it can lead to various pregnancy complications, it does not involve an abnormal leakage of alpha-fetoprotein from the fetus into the maternal circulation.
*Robertsonian translocation*
- A **Robertsonian translocation** is a type of chromosomal rearrangement that can lead to miscarriages, stillbirths, or live births with chromosomal abnormalities such as **Down syndrome** (if one parent is a carrier for t(14;21)).
- While it can be associated with aneuploidy, it does **not directly cause an elevated MSAFP** in a chromosomally normal infant. Elevated MSAFP is typically linked to neural tube defects or ventral wall defects, not chromosomal translocations in a healthy infant.
*Gestational trophoblastic disease*
- **Gestational trophoblastic disease** (e.g., hydatidiform mole) would typically present with **abnormally high hCG levels**, often much higher than normal for gestational age, and an abnormal ultrasound revealing a "snowstorm" appearance, not primarily an isolated elevated MSAFP with normal hCG.
- It involves abnormal placental development, and the **fetus usually does not develop** or is severely abnormal, which contradicts the scenario of a full-term, healthy infant with a normal karyotype.
Question 56: A 28-year-old woman presents with a malodorous vaginal discharge and itchiness that have lasted for 15 days. She reports that the smell of the discharge is worse after intercourse and is accompanied by a whitish-gray fluid. She has no significant past medical or gynecological history. She is in a stable monogamous relationship and has never been pregnant. She is diagnosed with bacterial vaginosis and prescribed an antimicrobial agent. Which of the following diagnostic features is consistent with this patient’s condition?
A. Vaginal fluid pH > 4.5, clue cells present on a saline smear of the vaginal secretions, along with a fishy odor on addition of KOH (Correct Answer)
B. Vaginal fluid pH < 4.5, lactobacilli predominance on the microscopic examination of the vaginal secretions, which are scant and clear
C. Vaginal fluid pH > 5.0, motile flagellated pyriform protozoa seen on the microscopic examination of the vaginal secretions
D. Vaginal fluid pH > 4.0, hyphae on the microscopic examination of the vaginal secretions after the addition of KOH
Explanation: ***Vaginal fluid pH > 4.5, clue cells present on a saline smear of the vaginal secretions, along with a fishy odor on addition of KOH***
- These findings represent three of the four Amsel criteria for diagnosing **bacterial vaginosis (BV)**: **vaginal fluid pH > 4.5**, presence of **clue cells** on microscopy, and a **positive whiff test (fishy odor with KOH)**. The fourth criterion is a homogeneous, thin, white discharge that coats the vaginal walls.
- The patient's symptoms of malodorous vaginal discharge (worse after intercourse) and whitish-gray fluid are classic presentations of BV, which are directly supported by these diagnostic features.
*Vaginal fluid pH < 4.5, lactobacilli predominance on the microscopic examination of the vaginal secretions, which are scant and clear*
- A vaginal pH of **less than 4.5** and **lactobacilli predominance** are characteristic of a **healthy vaginal microbiome**, not bacterial vaginosis.
- Bacterial vaginosis is marked by a decrease in lactobacilli and an increase in anaerobic bacteria, leading to a higher vaginal pH.
*Vaginal fluid pH > 5.0, motile flagellated pyriform protozoa seen on the microscopic examination of the vaginal secretions*
- The presence of **motile, flagellated pyriform protozoa** on microscopy is pathognomonic for **trichomoniasis**, a sexually transmitted infection.
- While the pH might be elevated in trichomoniasis, the defining microscopic finding is specific to the causative organism, *Trichomonas vaginalis*.
*Vaginal fluid pH > 4.0, hyphae on the microscopic examination of the vaginal secretions after the addition of KOH*
- The appearance of **hyphae or pseudohyphae** (often budding yeast) on KOH wet mount is diagnostic for **vulvovaginal candidiasis (yeast infection)**.
- A vaginal pH greater than 4.0 may occur, but the presence of fungal elements is the key diagnostic feature for candidiasis, not bacterial vaginosis.
*Vaginal fluid pH > 6.0, scant vaginal secretions, increased parabasal cells*
- A vaginal pH **greater than 6.0**, especially with scant secretions and increased parabasal cells, suggests **atrophic vaginitis**, which is more common in postmenopausal women due to estrogen deficiency.
- This presentation does not align with the patient's age (28 years old) or her symptoms, nor is it consistent with bacterial vaginosis.
Question 57: A 31-year-old female presents to her gynecologist for a routine Pap smear. Her last Pap smear was three years ago and was normal. On the current Pap smear, she is found to have atypical squamous cells of unknown significance (ASCUS). Reflex HPV testing is positive. What is the best next step?
A. Colposcopy (Correct Answer)
B. Repeat Pap smear and HPV testing in 5 years
C. Repeat Pap smear in 3 years
D. Repeat Pap smear in 1 year
E. Loop electrosurgical excision procedure (LEEP)
Explanation: ***Colposcopy***
- A **colposcopy** is indicated for a patient over 25 with **atypical squamous cells of undetermined significance (ASCUS)** and a **positive high-risk human papillomavirus (HPV) test** to evaluate for cervical intraepithelial neoplasia (CIN).
- The positive HPV test suggests a higher risk of underlying cervical disease requiring direct visualization and potentially biopsy of abnormal areas.
*Repeat Pap smear and HPV testing in 5 years*
- This option is incorrect because a **positive HPV test** along with ASCUS indicates a need for more immediate and invasive evaluation than routine screening.
- Waiting five years could allow progression of potential **cervical dysplasia** without intervention.
*Repeat Pap smear in 3 years*
- This timeframe is typically for women aged 21-29 with a normal Pap smear and negative HPV, or for follow-up after low-grade abnormalities, not for ASCUS with positive HPV.
- The presence of **high-risk HPV** mandates a more aggressive follow-up strategy.
*Repeat Pap smear in 1 year*
- This might be an option for ASCUS with a **negative HPV test** or for adolescents, but it is insufficient when high-risk HPV is positive.
- A **high-risk HPV infection** following an ASCUS result requires colposcopy to rule out significant cervical lesions.
*Loop electrosurgical excision procedure (LEEP)*
- A **LEEP** is a therapeutic procedure used to remove abnormal cervical tissue, usually performed after a colposcopy and biopsy confirms a high-grade lesion (CIN 2 or 3).
- Performing a LEEP immediately without a preceding colposcopy and biopsy would be **premature** as the diagnosis of the severity of cervical changes is not yet confirmed.
Question 58: A 23-year-old woman comes to the physician because of vaginal discharge for 3 days. She has been sexually active with three male partners over the past year and uses condoms inconsistently. Her only medication is an oral contraceptive. Physical exam shows thin grayish-white vaginal discharge. There is no erythema of the vaginal mucosa. The pH of the discharge is 5.9. Adding potassium hydroxide (KOH) to a mount containing vaginal discharge produces a fishy odor. Further evaluation of this patient's vaginal discharge is most likely to show which of the following findings?
A. Spiral-shaped bacteria
B. Gram-variable rod (Correct Answer)
C. Gram-negative diplococci
D. Pseudohyphae
E. Flagellated protozoa
Explanation: ***Gram-variable rod***
- The constellation of symptoms including **thin grayish-white vaginal discharge**, vaginal pH > 4.5 (**pH 5.9**), and a **fishy odor** upon adding KOH (**positive whiff test**) are characteristic findings of **bacterial vaginosis**.
- Bacterial vaginosis is caused by an overgrowth of *Gardnerella vaginalis*, which is a **Gram-variable rod** that can also appear as a pleomorphic Gram-negative or Gram-positive rod.
*Spiral-shaped bacteria*
- **Spiral-shaped bacteria**, such as *Treponema pallidum* (syphilis) or *Borrelia burgdorferi* (Lyme disease), are not associated with symptoms of bacterial vaginosis.
- These bacteria typically cause different clinical presentations, such as **genital chancres** or characteristic rashes, which are not described here.
*Gram-negative diplococci*
- **Gram-negative diplococci** are characteristic of *Neisseria gonorrhoeae*, which causes **gonorrhea**.
- Gonorrhea typically presents with **purulent discharge**, dysuria, and cervical inflammation, or it can be asymptomatic, but does not usually involve a fishy odor or an elevated vaginal pH in the range described.
*Pseudohyphae*
- **Pseudohyphae** (and budding yeasts) are characteristic findings in **candidiasis** (yeast infection).
- Candidiasis typically presents with **thick, white, curd-like discharge**, vaginal itching, and **erythema**, and the vaginal pH is usually normal (3.5-4.5) with no fishy odor.
*Flagellated protozoa*
- **Flagellated protozoa**, specifically *Trichomonas vaginalis*, cause **trichomoniasis**.
- This typically presents with **frothy, green-yellow discharge**, cervical petechiae (**strawberry cervix**), and a pH > 4.5, but the characteristic odor is often described as *foul* rather than simply "fishy" (though it can be similar), and **motile trichomonads** are seen on wet mount, not the described Gram-variable rods.
Question 59: A 27-year-old woman visits her family physician complaining of the recent onset of an unpleasant fish-like vaginal odor that has started to affect her sexual life. She was recently treated for traveler’s diarrhea after a trip to Thailand. External genitalia appear normal on pelvic examination, speculoscopy shows a gray, thin, homogenous, and malodorous vaginal discharge. Cervical mobilization is painless and no adnexal masses are identified. A sample of the vaginal discharge is taken for saline wet mount examination. Which of the following characteristics is most likely to be present in the microscopic evaluation of the sample?
A. Clue cells on saline smear (Correct Answer)
B. Hyphae
C. Motile flagellates
D. Polymorphonuclear cells (PMNs) to epithelial cell ratio of 2:1
E. Gram-negative diplococci
Explanation: ***Clue cells on saline smear***
- The symptoms of **fish-like vaginal odor**, **gray, thin, and malodorous discharge** are highly suggestive of **bacterial vaginosis (BV)**.
- **Clue cells** are **epithelial cells** covered in bacteria and are the hallmark diagnostic feature of BV on wet mount.
*Hyphae*
- **Hyphae** (or pseudohyphae) are characteristic of **candidiasis** (yeast infection).
- Candidiasis typically presents with **thick, white, cottage-cheese-like discharge** and **vaginal itching**, which are not described.
*Motile flagellates*
- **Motile flagellates** (specifically *Trichomonas vaginalis*) are characteristic of **trichomoniasis**.
- Trichomoniasis usually presents with **frothy, greenish-yellow discharge**, **cervical petechiae ("strawberry cervix")**, and **vulvar irritation**, which are absent here.
*Polymorphonuclear cells (PMNs) to epithelial cell ratio of 2:1*
- An elevated **PMN count** (especially a ratio like 2:1) is indicative of **vaginal inflammation** or **infection** such as cervicitis or trichomoniasis, but is typically **absent or low** in **bacterial vaginosis**.
- **Bacterial vaginosis** is characterized by a *decrease* in lactobacilli and an *overgrowth* of anaerobic bacteria, and often has **minimal host inflammatory response**.
*Gram-negative diplococci*
- **Gram-negative diplococci** are characteristic of **gonorrhea**, specifically *Neisseria gonorrhoeae*.
- Gonorrhea often presents with **purulent discharge**, **dysuria**, or can be **asymptomatic**, and is usually associated with **cervicitis**, which is not indicated by the painless cervical mobilization.
Question 60: A 28-year-old G1P0 woman at 16 weeks estimated gestational age presents for prenatal care. Routine prenatal screening tests are performed and reveal a positive HIV antibody test. The patient is extremely concerned about the possible transmission of HIV to her baby and wants to have the baby tested as soon as possible after delivery. Which of the following would be the most appropriate diagnostic test to address this patient’s concern?
A. CD4+ T cell count
B. Viral culture
C. Polymerase chain reaction (PCR) for HIV RNA (Correct Answer)
D. Antigen assay for p24
E. EIA for HIV antibody
Explanation: ***Polymerase chain reaction (PCR) for HIV RNA***
- **PCR for HIV RNA** directly detects the viral genetic material, providing a definitive diagnosis of HIV infection in an infant.
- Unlike antibody tests, PCR can distinguish between passively acquired maternal antibodies and actual infant infection, making it suitable for newborns.
*CD4+ T cell count*
- **CD4+ T cell count** is used to monitor the progression of HIV infection and immunosuppression, not for initial diagnosis, especially in neonates.
- While it's an important marker for HIV disease, it does not confirm the presence of the virus itself in a newborn.
*Viral culture*
- **Viral culture** is a highly specific method for detecting HIV, but it is expensive, time-consuming, and technically demanding.
- It is not routinely used for rapid early diagnosis in neonates due to its practical limitations and the availability of faster, reliable alternatives like PCR.
*Antigen assay for p24*
- The **p24 antigen test** can detect early HIV infection in adults, but its sensitivity is lower in neonates compared to PCR, especially immediately after birth.
- It may not reliably detect infection in newborns due to low viral loads or the presence of maternal antibodies that complex the antigen.
*EIA for HIV antibody*
- An **EIA for HIV antibody** will detect maternal antibodies that have crossed the placenta, meaning it will be positive in nearly all infants born to HIV-positive mothers, regardless of the infant's infection status.
- This test cannot distinguish between passive maternal antibody transfer and true infant infection.
