Prenatal Care Practice Questions

Q: Amniocentesis is done for all of the mentioned indications EXCEPT?

Oligohydramnios. **Explanation:** Amniocentesis is a procedure where amniotic fluid is aspirated from the gravid uterus for diagnostic or therapeutic purposes. The correct answer is **Oligohydramnios** because it is a **contraindication** (or a technical limitation) rather than an indication. 1. **Why Oligohydramnios is the Correct Answer:** Amniocentesis requires an adequate pocket of amniotic fluid to safely insert the needle without injuring the fetus or the umbilical cord. In oligohydramnios (decreased fluid volume), the risk of fetal injury and "dry tap" (failure to obtain fluid) is significantly high. In fact, amniocentesis is often used to *treat* polyhydramnios (therapeutic amnioreduction), not oligohydramnios. 2. **Analysis of Other Options:** * **Fetal Lung Maturity:** Historically, the L/S ratio (Lecithin/Sphingomyelin) and Phosphatidylglycerol levels were measured via amniocentesis to assess lung maturity before elective preterm delivery. * **Congenital Infections:** Amniotic fluid PCR is the gold standard for diagnosing intrauterine infections like TORCH (especially CMV and Toxoplasmosis). * **Genetic Defects:** This is the most common indication. Amniotic fluid contains desquamated fetal cells (amniocytes) used for karyotyping, FISH, and chromosomal microarray to detect Down syndrome and other aneuploidies. **NEET-PG High-Yield Pearls:** * **Timing:** Ideally performed between **15–20 weeks** of gestation. * **Early Amniocentesis:** Done between 12–14 weeks; however, it is associated with a higher risk of clubfoot (talipes equinovarus) and procedure loss. * **Risk of Fetal Loss:** Approximately 0.5% (1 in 200). * **Rh-Negative Mothers:** Always administer Anti-D immunoglobulin after the procedure to prevent isoimmunization.

Q: A high level of hCG is seen in all of the following conditions EXCEPT:

Neural tube defect. **Explanation:** Human Chorionic Gonadotropin (hCG) is a glycoprotein hormone produced by the syncytiotrophoblast. Understanding its variations is crucial for prenatal screening and oncology. **Why Neural Tube Defects (NTDs) is the correct answer:** In cases of **Neural Tube Defects** (like anencephaly or spina bifida), the primary biochemical marker that increases is **Alpha-Fetoprotein (AFP)**, due to leakage from the exposed fetal tissues. hCG levels typically remain **normal** in isolated NTDs. Therefore, it is the "except" in this list. **Analysis of Incorrect Options:** * **Down Syndrome (Trisomy 21):** In the second-trimester quadruple screen, Down syndrome is characterized by **elevated hCG** and Inhibin-A, while AFP and unconjugated Estriol (uE3) are decreased (Mnemonic: **HI**gh for **H**CG and **I**nhibin). * **Gestational Trophoblastic Disease (GTD):** Conditions like Hydatidiform mole involve massive proliferation of trophoblastic tissue, leading to **extremely high levels of hCG** (often >100,000 mIU/mL). * **Germ Cell Tumors:** Certain ovarian or testicular germ cell tumors, specifically **Choriocarcinomas** and some Dysgerminomas/Embryonal carcinomas, secrete hCG as a tumor marker. **High-Yield NEET-PG Pearls:** * **Low hCG levels** are associated with: Ectopic pregnancy (lower than expected for gestational age), threatened abortion, and Edwards syndrome (Trisomy 18). * **High hCG levels** are also seen in: Multiple pregnancies and Rh isoimmunization (due to placental hydrops). * **AFP** is the marker of choice for NTDs; it is **decreased** in Down syndrome.

Q: A patient is at 20 weeks of gestation. The patient's last menstrual period (LMP) was on January 9th. What is the estimated date of delivery?

October 16th. **Explanation:** The estimated date of delivery (EDD) is calculated using **Naegele’s Rule**, which is a standard clinical tool used in obstetrics. According to this rule, the EDD is determined by adding **9 months and 7 days** to the first day of the patient’s last menstrual period (LMP). **Calculation for this case:** * **LMP:** January 9th * **Add 7 days:** January 9 + 7 = January 16th * **Add 9 months:** January + 9 months = **October 16th** **Analysis of Options:** * **Option C (Correct):** Follows Naegele’s Rule correctly (Jan 9 + 9 months + 7 days). * **Option A:** This is simply the date of the LMP, not the delivery date. * **Option B:** This date is exactly 36 weeks from the LMP, which is premature. * **Option D:** This adds 9 months but forgets to add the 7 days required by the formula. **Clinical Pearls for NEET-PG:** 1. **Naegele’s Rule Assumptions:** It assumes a standard 28-day menstrual cycle with ovulation occurring on day 14. 2. **Cycle Adjustment:** If a patient has a longer cycle, add the extra days (e.g., for a 30-day cycle, add 9 days instead of 7). If shorter, subtract the difference. 3. **Alternative Formula:** You can also calculate EDD by subtracting 3 months from the LMP and adding 7 days and 1 year. 4. **Gold Standard:** While Naegele’s Rule is used for LMP, **First Trimester Ultrasound (Crown-Rump Length)** is the most accurate method for dating a pregnancy.

Q: All of the following are considered as high-risk pregnancy except?

Short-statured primi (150 cm and below). In prenatal care, a **high-risk pregnancy** is one where the mother, fetus, or newborn is at increased risk of adverse outcomes. ### Why Option B is the Correct Answer The standard clinical definition for a "short-statured primi" in the context of high-risk screening is a height of **140 cm (4'7") or below**, not 150 cm. While a woman measuring 150 cm is relatively short, she is not automatically categorized as "high-risk" unless other complications exist. A height of $\leq$ 140 cm is a significant risk factor because it is strongly associated with a **contracted pelvis**, increasing the risk of Cephalopelvic Disproportion (CPD) and obstructed labor. ### Analysis of Other Options * **A. Elderly Primi ($\geq$ 30 years):** Women embarking on their first pregnancy at age 30 or older are high-risk due to increased incidences of pre-eclampsia, gestational diabetes, chromosomal abnormalities (like Down Syndrome), and uterine fibroids. * **C. Previous Cesarean/Instrumental Delivery:** These patients are at risk for uterine rupture (in the case of prior C-section) or recurrent mechanical issues that necessitated instrumental intervention previously. * **D. Prolonged Pregnancy:** A pregnancy extending 14 days beyond the EDD (Post-term, $\geq$ 42 weeks) is high-risk due to **placental insufficiency**, oligohydramnios, and meconium aspiration syndrome. ### NEET-PG High-Yield Pearls * **Short Stature Cut-off:** Always remember the **140 cm** threshold for high-risk categorization in Indian guidelines. * **Age Extremes:** Both "Teenage Primi" ($<$ 18 years) and "Elderly Primi" ($\geq$ 30 years) are considered high-risk. * **The "Rule of Too":** Too young, too old, too many (grand multipara), and too soon (short birth interval) all define high-risk status.

Q: A 28-year-old G1P0 presents at 18 weeks gestational age with right-sided groin pain, described as sharp and occurring with movement and exercise. She denies any changes in urinary or bowel habits, fever, or chills. A heating pad helps alleviate the discomfort. What is the most likely etiology of this pain?

Round ligament pain. **Explanation:** **1. Why Round Ligament Pain is correct:** Round ligament pain is a common, benign cause of pelvic discomfort during the second trimester (typically 16–20 weeks). As the uterus grows, the round ligaments (which extend from the uterine horns to the labia majora via the inguinal canal) undergo significant stretching and hypertrophy. Sudden movements, exercise, or changes in position cause these ligaments to contract or pull on nearby nerve fibers, resulting in **sharp, stabbing, or "pulling" pain** in the lower quadrants or groin. The absence of systemic symptoms (fever) and relief with heat or rest are classic diagnostic features. **2. Why the other options are incorrect:** * **Appendicitis:** While the appendix is displaced upward during pregnancy, appendicitis typically presents with persistent, worsening pain, anorexia, nausea, and fever. It would not be transient or relieved by simple heat. * **Kidney Stone (Nephrolithiasis):** This usually presents with colicky, excruciating flank pain radiating to the groin, often accompanied by hematuria. * **Urinary Tract Infection (UTI):** UTIs in pregnancy typically present with frequency, urgency, dysuria, or suprapubic pain. The patient specifically denied urinary habit changes. **Clinical Pearls for NEET-PG:** * **Anatomy:** The round ligament is a remnant of the **gubernaculum**. * **Location:** Pain is more common on the **right side** due to the physiological **dextrorotation** of the uterus. * **Management:** Reassurance, pelvic tilts, and warm compresses. * **Differential Diagnosis:** Always rule out preterm labor if the pain is rhythmic or associated with vaginal bleeding/discharge.

Q: Estimation of maternal serum alpha-fetoprotein helps in the diagnosis of all the following conditions EXCEPT:

Fetal hepatitis. **Explanation:** Maternal Serum Alpha-Fetoprotein (MSAFP) is a glycoprotein produced initially by the yolk sac and later by the fetal liver. It enters the amniotic fluid via fetal urine and crosses into the maternal circulation. **Why Fetal Hepatitis is the correct answer:** While MSAFP is produced in the fetal liver, **fetal hepatitis** does not typically cause an elevation in maternal serum levels. MSAFP screening is primarily used to detect structural defects where fetal proteins "leak" into the amniotic fluid or conditions where placental permeability is altered. In hepatitis, the liver cells are inflamed, but there is no open defect or increased leakage mechanism to elevate MSAFP levels in the mother. **Analysis of Incorrect Options:** * **Spina Bifida & Anencephaly:** These are Neural Tube Defects (NTDs). In "open" NTDs, the absence of skin covering allows AFP to leak directly from the fetal serum/CSF into the amniotic fluid, leading to significantly elevated MSAFP. * **Tracheoesophageal Fistula (TEF):** This is associated with elevated MSAFP because the fetus cannot swallow amniotic fluid normally (impaired digestion/processing of AFP), leading to its accumulation in the amniotic sac and subsequent rise in maternal serum. **NEET-PG High-Yield Pearls:** * **Elevated MSAFP (>2.5 MoM):** Neural tube defects (Anencephaly, Spina bifida), Abdominal wall defects (Omphalocele, Gastroschisis), Multiple gestations, and Renal anomalies (Finnish-type nephrosis). * **Decreased MSAFP:** Down Syndrome (Trisomy 21), Edwards Syndrome (Trisomy 18), and Gestational Trophoblastic Disease. * **Most common cause of elevated MSAFP:** Incorrect dating (underestimation of gestational age). * **Timing:** Optimal screening is performed between **15–20 weeks** of gestation.

Question 1

Myelodysplasia in a fetus can be best diagnosed by which of the following methods?

Accepted Answer

Alpha-fetoprotein (AFP)

Answer

Lumbar puncture

Answer

Human chorionic gonadotropin (HCG)

Answer

Unconjugated estriol

Question 2

Amniocentesis is done for all of the mentioned indications EXCEPT?

Accepted Answer

Oligohydramnios

Answer

Fetal lung maturity

Answer

Congenital infections

Answer

Genetic defects

Question 3

What is the appropriate treatment for a woman experiencing edema during pregnancy?

Accepted Answer

Bed rest

Answer

Salt restriction

Answer

Fluid restriction

Answer

Diuretics

Question 4

A 32-year-old G3P20L2 presents to the obstetrician's office for a routine OB visit at 30 weeks gestation. She has had no complications during the pregnancy and has had regular prenatal care. Her gestational age is confirmed with a first-trimester sonogram. During the routine OB visit, the fundal height measures 35 cm. All of the following can explain the size-date discrepancy except?

Accepted Answer

The 5-cm difference is within the error for fundal height measurements

Answer

Leiomyomas

Answer

Polyhydramnios

Answer

Fetal macrosomia

Question 5

A high level of hCG is seen in all of the following conditions EXCEPT:

Accepted Answer

Neural tube defect

Answer

Down syndrome

Answer

Germ cell tumor

Answer

Gestational trophoblastic disease

Question 6

A patient is at 20 weeks of gestation. The patient's last menstrual period (LMP) was on January 9th. What is the estimated date of delivery?

Accepted Answer

October 16th

Answer

January 9th

Answer

September 16th

Answer

October 9th

Question 7

All of the following are considered as high-risk pregnancy except?

Accepted Answer

Short-statured primi (150 cm and below)

Answer

Elderly primi (30 years and over)

Answer

History of previous cesarean or instrumental delivery

Answer

Prolonged pregnancy (14 days after expected date of delivery)

Question 8

A 28-year-old G1P0 presents at 18 weeks gestational age with right-sided groin pain, described as sharp and occurring with movement and exercise. She denies any changes in urinary or bowel habits, fever, or chills. A heating pad helps alleviate the discomfort. What is the most likely etiology of this pain?

Accepted Answer

Round ligament pain

Answer

Appendicitis

Answer

Kidney stone

Answer

Urinary tract infection

Question 9

A woman attends the antenatal clinic with a period of amenorrhea of 10 weeks and a history of exposure to rubella infection. Her immune status is not known. What is the next step in management?

Accepted Answer

Test maternal serum for rubella-specific IgG and IgM antibodies immediately and after 3 weeks

Answer

Administer acyclovir if the mother develops symptoms of rubella

Answer

Administer immunoglobulin to the mother

Answer

Advise termination of pregnancy if she contacts rubella

Question 10

Estimation of maternal serum alpha-fetoprotein helps in the diagnosis of all the following conditions EXCEPT:

Accepted Answer

Fetal hepatitis

Answer

Tracheoesophageal fistula

Answer

Spina bifida

Answer

Anencephaly

Prenatal Care — MCQs

Prenatal Care — MCQs

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