Screening Tests in Pregnancy Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Screening Tests in Pregnancy. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Screening Tests in Pregnancy Indian Medical PG Question 1: Test done at sub-centre during pregnancy:
- A. Haemoglobin (Correct Answer)
- B. Triple test
- C. USG
- D. OGTT
Screening Tests in Pregnancy Explanation: ***Haemoglobin***
- **Haemoglobin testing** is a routine and essential screening measure performed at the subcenter level during pregnancy, primarily to detect and monitor **anaemia**.
- Its simplicity, cost-effectiveness, and direct impact on maternal and fetal health make it suitable for primary healthcare settings.
*Triple test*
- The **triple test** (or multiple marker screen) is a prenatal diagnostic test for chromosomal abnormalities and neural tube defects, typically performed between weeks 15 and 20 of pregnancy.
- This test requires specialized laboratory facilities and interpretation, which are usually not available or routinely performed at the subcenter level.
*USG*
- **Ultrasonography (USG)** is a vital imaging technique used to monitor fetal growth, development, and maternal health during pregnancy.
- While crucial, USG requires specialized equipment and trained personnel (sonographers or radiologists) and is generally conducted in higher-level healthcare facilities, not routinely at a subcenter.
*OGTT*
- An **Oral Glucose Tolerance Test (OGTT)** is used to screen for **gestational diabetes mellitus**.
- While it is a routine test in pregnancy, performing a full OGTT (which involves multiple blood draws over several hours after glucose ingestion) is often logistically challenging for routine performance at a subcenter; usually, only initial screening (like random blood sugar or fasting glucose) or a single-step glucose challenge test might be done at a primary level before referral.
Screening Tests in Pregnancy Indian Medical PG Question 2: A woman presents with painless ulcers on the vulva, she gives a history of having multiple sexual partners and has had a stillbirth at 28 weeks in the past. What is the next best step of investigation?
- A. PCR
- B. VDRL (Correct Answer)
- C. Vaginal swab and culture
- D. NAT
Screening Tests in Pregnancy Explanation: ***VDRL***
- The presentation of **painless vulvar ulcers**, a history of **multiple sexual partners**, and a past **stillbirth at 28 weeks** are highly suggestive of **syphilis**.
- A **VDRL (Venereal Disease Research Laboratory) test** is a non-treponemal serologic test used for screening and monitoring the treatment of syphilis.
*PCR*
- While **PCR** can be used to detect the genetic material of *Treponema pallidum*, it is not the primary diagnostic test for syphilis, especially given the classic clinical picture.
- It is more commonly used for detecting other sexually transmitted infections (STIs) or for specific situations where direct detection of the organism from a lesion is preferred.
*Vaginal swab and culture*
- A **vaginal swab and culture** would be appropriate for diagnosing bacterial vaginosis, candidiasis, or certain bacterial STIs, but it is not suitable for diagnosing syphilis.
- Syphilis is caused by a spirochete (*Treponema pallidum*) that cannot be cultured on standard media.
*NAT*
- **Nucleic Acid Amplification Tests (NATs)** are a broad category of tests that include PCR.
- Like PCR, while potentially applicable for *Treponema pallidum* detection, they are not the standard or first-line diagnostic investigation for syphilis given the strong clinical indicators.
Screening Tests in Pregnancy Indian Medical PG Question 3: What are the criteria for administering Anti-D immunoglobulin postpartum in an Rh-negative female?
- A. DCT positive, Baby Rh +ve
- B. DCT negative, Baby Rh +ve (Correct Answer)
- C. DCT negative, Baby Rh -ve
- D. DCT positive, Baby Rh -ve
Screening Tests in Pregnancy Explanation: ***DCT negative, Baby Rh +ve***
* The mother is **Rh-negative** and needs Anti-D immunoglobulin if her baby is **Rh-positive** to prevent sensitization.
* A **negative Direct Coombs Test (DCT)** indicates that the mother has not yet developed antibodies against the baby's Rh-positive red blood cells, making Anti-D administration effective for prevention.
* *DCT positive, Baby Rh +ve*
* If the **DCT is positive**, it means the mother has already formed **antibodies** against the baby's Rh-positive red blood cells (sensitization has occurred).
* In this scenario, administering Anti-D immunoglobulin would be **ineffective** as the immune response has already begun.
* *DCT negative, Baby Rh -ve*
* If the baby is **Rh-negative**, there is no risk of Rh sensitization for an Rh-negative mother.
* Therefore, **Anti-D immunoglobulin is not necessary** in this situation.
* *DCT positive, Baby Rh -ve*
* A **positive DCT** in an Rh-negative mother implies sensitization has occurred, but it would not be due to an Rh-negative baby.
* Administering Anti-D immunoglobulin would be **ineffective** and unnecessary if the baby is Rh-negative.
Screening Tests in Pregnancy Indian Medical PG Question 4: Nuchal translucency in USG can be detected at_____weeks of gestation.
- A. 11-13 weeks (Correct Answer)
- B. 18-20 weeks
- C. 8-10 weeks
- D. 20-22 weeks
Screening Tests in Pregnancy Explanation: ***11-13 weeks***
- Nuchal translucency (NT) is a **first-trimester ultrasound marker** used for screening for chromosomal abnormalities like **Down syndrome**.
- The optimal window for accurate measurement is between **11 weeks 0 days and 13 weeks 6 days** of gestation, or when the crown-rump length (CRL) is between 45 mm and 84 mm.
*18-20 weeks*
- This period is typically dedicated to the **anomaly scan** or **mid-pregnancy scan**, which focuses on detecting structural abnormalities in the fetus.
- While other markers like **nuchal fold thickness** can be assessed later, the diagnostic value of Nuchal Translucency is decreased by this time.
*8-10 weeks*
- At this early stage, the fetus is generally **too small** for accurate and consistent measurement of the nuchal translucency.
- The nuchal translucency itself might not be fully developed or easily distinguishable for precise measurement.
*20-22 weeks*
- By this gestational age, the **nuchal translucency has usually resolved** or is no longer a reliable marker for chromosomal screening.
- This period is well beyond the recommended window for NT measurement, making it unsuitable for this specific screening test.
Screening Tests in Pregnancy Indian Medical PG Question 5: Most appropriate time for chorionic villus sampling in pregnancy is:
- A. 16-18 weeks
- B. 16-20 weeks
- C. 8-10 weeks
- D. 10-13 weeks (Correct Answer)
Screening Tests in Pregnancy Explanation: ***10-13 weeks***
- Chorionic villus sampling (CVS) is optimally performed between **10 and 13 completed weeks of gestation**.
- This timing allows for **earlier diagnosis** of chromosomal abnormalities compared to amniocentesis, enabling more time for decision-making.
*16-18 weeks*
- This timeframe is typically used for **amniocentesis**, which is performed later in pregnancy.
- Performing CVS at this stage is **outside the optimal window** and carries a higher risk profile for CVS specifically.
*16-20 weeks*
- This period is also generally recommended for **amniocentesis**, not chorionic villus sampling.
- Delaying CVS until this point **reduces the advantage** of early diagnosis and may increase procedural risks.
*8-10 weeks*
- Performing CVS **before 10 weeks of gestation** is associated with a **higher risk of limb reduction defects** in the fetus.
- Due to this significant risk, CVS is generally **contraindicated** before 10 weeks.
Screening Tests in Pregnancy Indian Medical PG Question 6: Which of the following represents the current recommendation for offering screening for Down's syndrome during pregnancy?
- A. 35
- B. No screening necessary
- C. 30
- D. All in the reproductive age group (Correct Answer)
Screening Tests in Pregnancy Explanation: ***All in the reproductive age group***
- The American College of Obstetricians and Gynecologists (ACOG) and other major medical bodies recommend that **all pregnant women**, regardless of age, be offered **screening for Down syndrome** and other aneuploidies.
- This recommendation reflects the principle of **patient autonomy** and the availability of safe and effective screening methods for all pregnancies, not just those considered high-risk based on maternal age.
*30*
- While the risk of Down syndrome increases with maternal age, **screening is not exclusively recommended for women aged 30**; rather, it is offered to all pregnant women.
- Focusing only on this age group would **miss cases** in younger women and limit informed decision-making.
*35*
- Historically, **maternal age 35** was considered the threshold for offering invasive diagnostic testing due to the significantly increased risk of Down syndrome.
- However, current guidelines emphasize universal screening, as a substantial number of babies with Down syndrome are born to women **younger than 35** due to higher birth rates in this group.
*No screening necessary*
- This option is incorrect as **screening is routinely offered** to all pregnant women to provide information about the risk of conditions like Down syndrome.
- Deciding to forgo screening or diagnostic testing is a personal choice, but the **option to screen should always be available** to the patient.
Screening Tests in Pregnancy Indian Medical PG Question 7: What is the preferred timing for routine urine sample collection in a pregnant female?
- A. Early morning sample (Correct Answer)
- B. Suprapubic puncture
- C. Mid-stream collection
- D. Catheterization
Screening Tests in Pregnancy Explanation: ***Early morning sample***
- An **early morning urine sample** is preferred because it is the most concentrated, increasing the likelihood of detecting abnormalities.
- This concentration allows for accurate assessment of substances like **blood cells**, **protein**, and **bacteria**, which might be diluted in samples collected later in the day.
*Mid-stream collection*
- **Mid-stream collection** aims to reduce contamination from the periurethral area but does not provide the same concentration as an early morning sample.
- While important for reducing contaminants, it's not the primary factor determining the optimal collection time for diagnosing pregnancy-related conditions.
*Suprapubic puncture*
- **Suprapubic puncture** is an invasive procedure generally reserved for situations where a clean catch is impossible or contamination is a significant concern, typically in infants or critically ill patients.
- It carries risks such as **pain**, **hematuria**, and potential **bowel perforation**, making it unsuitable for routine urine collection in pregnant women.
*Catheterization*
- **Catheterization** is an invasive method that carries a risk of introducing infection into the bladder.
- It is usually performed only when a clean-catch sample cannot be obtained or when precise measurement of residual urine is necessary, not for routine screening in pregnant women.
Screening Tests in Pregnancy Indian Medical PG Question 8: Most accurate method to confirm viable intrauterine pregnancy at 6 weeks' gestation is
- A. USG fetal cardiac activity (Correct Answer)
- B. Clinical examination
- C. Urine HCG test
- D. Doppler ultrasound in specific clinical situations
Screening Tests in Pregnancy Explanation: **USG fetal cardiac activity**
- At 6 weeks' gestation, the presence of **fetal cardiac activity** on ultrasound is the definitive sign of a **viable intrauterine pregnancy**.
- This finding confirms both the presence of an embryo and its vital status, providing direct evidence of viability.
*Urine HCG test*
- A **urine HCG test** confirms the presence of pregnancy but does not provide information about its viability or location (intrauterine vs. ectopic).
- High HCG levels can be present even in non-viable or ectopic pregnancies.
*Clinical examination*
- A **clinical examination** may reveal signs consistent with pregnancy, such as an enlarged uterus, but it cannot definitively confirm **intrauterine location** or **fetal viability** at 6 weeks' gestation.
- These findings are supportive but not diagnostic of viability.
*Doppler ultrasound in specific clinical situations*
- Doppler ultrasound is typically used to assess **blood flow** to various structures and may be useful in later pregnancy for assessing fetal well-being or placental function.
- It is not the primary or most accurate method to confirm early **fetal cardiac activity** or viability at 6 weeks' gestation compared to standard grayscale ultrasound.
Screening Tests in Pregnancy Indian Medical PG Question 9: A 7-week pregnant lady underwent a chest X-ray by mistake. What is to be done?
- A. Terminate the pregnancy immediately due to radiation exposure.
- B. Perform chromosomal testing to assess fetal damage.
- C. Reassure the patient and continue the pregnancy. (Correct Answer)
- D. Conduct prenatal invasive diagnostic tests to evaluate fetal health.
Screening Tests in Pregnancy Explanation: **Reassure the patient and continue the pregnancy.**
- A single chest X-ray delivers a **negligible dose of radiation (around 0.01 mGy)** to the embryo/fetus, which is significantly below the threshold for causing congenital abnormalities or pregnancy loss.
- The **teratogenic threshold** for radiation exposure is generally considered to be around **50-100 mGy**, making a single chest X-ray exposure well within safe limits.
*Terminate the pregnancy immediately due to radiation exposure.*
- There is **no clinical justification** for pregnancy termination based on a single chest X-ray, as the radiation dose is far too low to cause significant harm.
- Such an intervention would be based on **misinformation** and could lead to unnecessary emotional distress and ethical concerns.
*Perform chromosomal testing to assess fetal damage.*
- Chromosomal testing is **not indicated** for low-dose radiation exposure from a single chest X-ray, as this type of exposure is unlikely to cause chromosomal abnormalities.
- The radiation dose is simply too low to inflict the kind of damage that would necessitate such invasive and often risky procedures.
*Conduct prenatal invasive diagnostic tests to evaluate fetal health.*
- Invasive prenatal diagnostic tests, such as **amniocentesis or chorionic villus sampling**, carry their own risks and are not warranted for a benign exposure like a chest X-ray.
- These tests are typically reserved for situations with a much higher established risk of fetal anomalies.
Screening Tests in Pregnancy Indian Medical PG Question 10: A 7 weeks pregnant lady has 1 accidental exposure to x-ray. Which of the following should be done?
- A. Continue the pregnancy with monitoring (Correct Answer)
- B. Perform chromosome analysis if needed
- C. Conduct pre-invasive diagnostic testing if indicated
- D. Consider termination of pregnancy
Screening Tests in Pregnancy Explanation: ***Continue the pregnancy with monitoring***
- The risk of **fetal malformation** and **intellectual disability** from a single diagnostic X-ray exposure is generally considered very low, often below the threshold for clinical concern.
- Current guidelines typically recommend continuing pregnancy with routine monitoring unless the estimated fetal dose exceeds a certain threshold (e.g., 50-100 mGy), which is unlikely with a single accidental exposure.
*Perform chromosome analysis if needed*
- **Chromosome analysis** is generally reserved for cases with suspected genetic anomalies or significant fetal exposure to radiation at doses known to induce chromosomal damage.
- A single, accidental X-ray exposure is unlikely to cause clinically significant chromosomal aberrations requiring such invasive testing.
*Conduct pre-invasive diagnostic testing if indicated*
- **Pre-invasive diagnostic testing**, such as nuchal translucency scans or maternal serum screening, assesses risks for common aneuploidies and neural tube defects, not typically direct radiation effects.
- While these tests are part of routine prenatal care, a single X-ray exposure does not, by itself, create a specific indication for additional pre-invasive testing beyond standard recommendations.
*Consider termination of pregnancy*
- **Termination of pregnancy** is usually considered only in cases of significant, confirmed fetal harm or very high radiation doses that unequivocally increase the risk of severe birth defects or intellectual disability.
- A single accidental X-ray exposure almost certainly does not meet this threshold, as the associated risks to the fetus are minimal.
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