Prenatal Care Practice Questions

Q: Alpha-fetoprotein levels are increased in all EXCEPT:

Down syndrome. **Explanation:** Alpha-fetoprotein (AFP) is a glycoprotein synthesized initially by the yolk sac and later by the fetal liver. It is the fetal equivalent of albumin. Understanding its levels is crucial for prenatal screening. **Why Down Syndrome is the correct answer:** In **Down Syndrome (Trisomy 21)**, maternal serum AFP (MSAFP) levels are characteristically **decreased** (usually <0.5 MoM). The exact mechanism is not fully understood, but it is attributed to reduced synthesis by the fetal liver and a smaller-than-normal yolk sac. In a "Triple Test" for Down Syndrome, you typically see **Low AFP, Low Estriol (uE3), and High hCG.** **Why the other options are incorrect (Causes of Increased AFP):** * **Open Neural Tube Defects (ONTDs):** Conditions like anencephaly or spina bifida allow AFP to leak directly from the fetal cerebrospinal fluid into the amniotic fluid and maternal circulation, causing a significant rise. * **Twin Pregnancy:** AFP levels are roughly proportional to the number of fetuses; more fetal liver mass results in higher cumulative MSAFP. * **Intrauterine Death (IUD):** Fetal demise leads to the breakdown of fetal tissues and increased permeability of the skin/vessels, allowing massive amounts of AFP to diffuse into the maternal blood. **NEET-PG High-Yield Pearls:** * **Most common cause of increased MSAFP:** Underestimation of gestational age (wrong dates). * **Other causes of High AFP:** Omphalocele, Gastroschisis, Turner Syndrome (with cystic hygroma), and Renal anomalies (Finnish-type nephrosis). * **Low AFP is also seen in:** Trisomy 18 (Edwards Syndrome), Gestational Trophoblastic Disease (Molar pregnancy), and Maternal Obesity. * **Amniotic Fluid Acetylcholinesterase (AChE):** This is the confirmatory test used if AFP is elevated to differentiate between a true NTD and other causes.

Q: In which type of abortion does the gestational age correspond to the uterine size?

Threatened. In clinical practice, comparing uterine size to the period of amenorrhea (POA) is a high-yield diagnostic tool for differentiating types of abortion. **Explanation of the Correct Answer:** In **Threatened Abortion**, the pregnancy is still viable and the products of conception (POC) are entirely intact within the uterus. The cervical os remains closed. Because the gestational sac and fetus continue to develop normally despite the vaginal bleeding, the **uterine size corresponds to the gestational age.** **Analysis of Incorrect Options:** * **Inevitable Abortion:** While the POC are still inside, the cervical os is dilated and heavy bleeding/rupture of membranes often occurs. While the size may initially correspond, it is often slightly **less than or equal to** gestational age due to the impending expulsion and loss of liquor. * **Complete Abortion:** All products of conception have been expelled. Consequently, the uterus is empty and contracted, making the **uterine size significantly smaller** than the gestational age. * **Missed Abortion:** The fetus has died in utero but is retained. Over time, the amniotic fluid is absorbed and the POC macerate, leading to a **uterine size that is less than** the period of amenorrhea. **High-Yield Clinical Pearls for NEET-PG:** * **Uterine Size > POA:** Think of Molar Pregnancy, Multiple Gestation, or Polyhydramnios. * **Uterine Size < POA:** Think of Missed Abortion, Complete Abortion, or IUGR. * **Internal Os Status:** It is **Closed** in Threatened and Missed abortions; it is **Open** in Inevitable and Incomplete abortions. * **Management:** Threatened abortion is managed conservatively (bed rest and progesterone), whereas Inevitable/Missed abortions require medical or surgical evacuation.

Q: A 28-year-old primigravida has a pre-pregnancy BMI of 30 kg/m². What is the recommended weight gain for her during pregnancy?

5-7 kg. ### Explanation The recommended weight gain during pregnancy is strictly determined by the patient’s **pre-pregnancy Body Mass Index (BMI)**. This guideline ensures optimal fetal growth while minimizing maternal complications like gestational diabetes, pre-eclampsia, and macrosomia. **1. Why Option A is Correct:** The patient is a primigravida with a BMI of **30 kg/m²**, which classifies her as **Obese** (BMI ≥ 30). According to the Institute of Medicine (IOM) and ACOG guidelines: * **Obese (BMI ≥ 30):** Recommended weight gain is **5–9 kg** (often simplified to 5–7 kg in Indian clinical contexts and exams). * The goal for obese women is to limit gain to the minimum required for fetal and placental development to avoid postpartum weight retention and metabolic risks. **2. Why Other Options are Incorrect:** * **Option B (8–11 kg):** This is the recommendation for **Overweight** women (BMI 25–29.9 kg/m²), where the range is 7–11.5 kg. * **Option C (10–13 kg):** This is the standard recommendation for women with a **Normal BMI** (18.5–24.9 kg/m²), where the range is 11.5–16 kg. * **Option D (14–16 kg):** This is recommended for **Underweight** women (BMI < 18.5 kg/m²), who require a higher gain of 12.5–18 kg to ensure adequate birth weight. **3. High-Yield Clinical Pearls for NEET-PG:** * **Twin Pregnancy:** Recommended gain is 17–25 kg for normal BMI, 14–23 kg for overweight, and 11–19 kg for obese. * **Rate of Gain:** In the 2nd and 3rd trimesters, a woman with a normal BMI should gain roughly **0.45 kg/week**, while an obese woman should gain only **0.22 kg/week**. * **Weight Loss:** Intentional weight loss during pregnancy is **never** recommended, even for morbidly obese patients.

Q: A 22-year-old female on antiepileptic therapy got married. When should folic acid supplementation be advised to this female?

All women who could become pregnant. **Explanation:** The primary goal of folic acid supplementation is the prevention of **Neural Tube Defects (NTDs)**, such as spina bifida and anencephaly. The neural tube closes by the **28th day of gestation** (often before a woman even realizes she is pregnant). Therefore, for supplementation to be effective, it must be present in the system at the time of conception and during the very early stages of organogenesis. **Why Option B is Correct:** Current clinical guidelines (WHO and ACOG) recommend that **all women of reproductive age who could become pregnant** should take folic acid. This is because nearly 50% of pregnancies are unplanned. In this specific case, the patient is on **antiepileptic drugs (AEDs)**, many of which (like Valproate or Carbamazepine) are folate antagonists and significantly increase the risk of NTDs. **Why Other Options are Incorrect:** * **Option A:** While starting 3 months prior is ideal for planned pregnancies, the recommendation "all women who could become pregnant" is more comprehensive and covers the risk of unplanned conception. * **Option C:** By the time pregnancy is confirmed (usually 5–6 weeks), the neural tube has already closed. Supplementation at this stage is too late to prevent NTDs. * **Option D:** Folic acid is required during the periconceptional period and pregnancy; starting after delivery serves no preventive purpose for the fetus. **High-Yield Clinical Pearls for NEET-PG:** * **Standard Dose:** 400 mcg (0.4 mg) daily for low-risk women. * **High-Risk Dose:** **4 mg (4000 mcg)** daily for women on AEDs or those with a previous history of a child with NTD. * **Timing:** Ideally started at least 1–3 months before conception and continued until the end of the first trimester (12 weeks).

Q: Low MSAFP is seen in all of the following except?

Neural tube defect. **Explanation:** The core concept behind **Maternal Serum Alpha-Fetoprotein (MSAFP)** levels is the integrity of the fetal skin and body wall. AFP is produced by the fetal yolk sac and liver; it enters the amniotic fluid via fetal urine and crosses into the maternal circulation. **1. Why "Neural Tube Defect" is the correct answer:** In **Neural Tube Defects (NTDs)**, such as anencephaly or spina bifida, there is an open defect in the fetal skin/spine. This allows AFP to leak directly from the fetal circulation/cerebrospinal fluid into the amniotic fluid, leading to **elevated (high) MSAFP** levels. Since the question asks which condition does *not* cause low MSAFP, NTDs are the correct choice. **2. Analysis of incorrect options (Conditions with Low MSAFP):** * **Trisomy 21 (Down Syndrome):** Characteristically associated with **low MSAFP**, low Estriol (uE3), and high hCG/Inhibin-A (the "Quadruple Screen" pattern). * **Skeletal Deformities & Cardiac Anomalies:** These conditions, along with Trisomy 18 and molar pregnancies, are frequently associated with decreased production or transport of AFP, resulting in **low MSAFP** levels. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of elevated MSAFP:** Underestimation of gestational age (wrong dates). * **Other causes of High MSAFP:** Multiple gestations, Omphalocele, Gastroschisis, and Pilonidal cysts. * **Other causes of Low MSAFP:** Maternal obesity, Diabetes mellitus, and Trisomy 18 (Edwards Syndrome). * **Rule of Thumb:** "Open" defects (leaks) = High AFP; Chromosomal/Internal anomalies = Low AFP.

Q: All of the following are commonly used for estimation of gestational age in mid-trimester EXCEPT?

Crown Rump Length. **Explanation:** The estimation of gestational age (GA) via ultrasonography relies on different parameters depending on the trimester of pregnancy. **Why Crown Rump Length (CRL) is the correct answer:** CRL is the measurement of the length of the embryo or fetus from the top of the head (crown) to the bottom of the buttocks (rump). It is the **most accurate parameter** for dating a pregnancy, but its utility is strictly limited to the **first trimester** (up to 13 weeks and 6 days). After 14 weeks (mid-trimester), the fetus begins to curl and stretch, making CRL measurements inconsistent and inaccurate. Therefore, it is not used in the mid-trimester. **Analysis of incorrect options (Mid-trimester parameters):** In the second trimester (14–28 weeks), a combination of biometric parameters is used to calculate GA: * **Biparietal Diameter (BPD):** Measured at the level of the thalami and cavum septum pellucidum. It is very reliable in the second trimester. * **Femur Length (FL):** The most reliable long bone measurement for GA; it correlates well with BPD. * **Abdominal Circumference (AC):** While primarily used to monitor fetal growth and weight, it is still a standard component of the biometric profile used to estimate GA in the mid-trimester. **High-Yield NEET-PG Pearls:** * **Most accurate overall:** CRL in the 1st trimester (accuracy ± 3–5 days). * **Best time for CRL:** 7 to 12 weeks. * **Mid-trimester accuracy:** Accuracy decreases to ± 7–10 days. * **Late pregnancy:** In the 3rd trimester, USG is least accurate for dating (± 3 weeks). * **Transvaginal Sonography (TVS):** Can detect a gestational sac as early as 4.5–5 weeks.

Q: In Down's syndrome, what are the typical serum markers and nuchal translucency (NT) findings?

Decreased MSAFP, PAPP-A and UE3 and Increased hCG, NT > 3mm. In Down’s syndrome (Trisomy 21), the biochemical profile is characterized by a "High-Low" pattern. The correct answer is **B** because it reflects the classic markers used in first and second-trimester screening. ### **Medical Concept** * **First Trimester (11–13.6 weeks):** Screening relies on **PAPP-A** (Pregnancy-associated plasma protein A) and **Nuchal Translucency (NT)**. In Trisomy 21, PAPP-A is **decreased**, while the NT is **increased** (>3 mm), representing subcutaneous fluid collection at the back of the fetal neck. * **Second Trimester (15–20 weeks):** The "Quadruple test" shows **decreased MSAFP** (Maternal Serum Alpha-fetoprotein) and **decreased UE3** (Unconjugated Estriol), but **increased hCG** and **Inhibin-A**. The mnemonic **"HI"** (hCG and Inhibin) are **High** in Down’s syndrome. ### **Analysis of Incorrect Options** * **Option A & D:** Incorrect because MSAFP and UE3 are characteristically **decreased** in Down’s syndrome. Increased MSAFP is associated with Neural Tube Defects (NTD) or abdominal wall defects. * **Option C:** Incorrect because **hCG is elevated** in Down’s syndrome. A decrease in all markers (MSAFP, UE3, and hCG) is typically seen in **Trisomy 18 (Edwards Syndrome)**. ### **NEET-PG High-Yield Pearls** * **Most sensitive single marker:** NT (Nuchal Translucency). * **Most sensitive biochemical marker (2nd Trimester):** Inhibin-A. * **Trisomy 18 (Edwards):** All markers (hCG, AFP, UE3) are **decreased**. * **Trisomy 13 (Patau):** PAPP-A and hCG are decreased; MSAFP is usually normal. * **Combined Test:** NT + PAPP-A + hCG (Detection rate ~85-90%).

Q: Alpha-fetoprotein levels are increased in all of the following conditions except:

Chromosomal trisomy. **Explanation:** Alpha-fetoprotein (AFP) is a glycoprotein produced initially by the yolk sac and later by the fetal liver. It is a crucial biomarker in prenatal screening, typically measured between 15–20 weeks of gestation. **Why Chromosomal Trisomy is the Correct Answer:** In pregnancies affected by **Chromosomal Trisomies** (specifically Down Syndrome/Trisomy 21 and Edwards Syndrome/Trisomy 18), maternal serum AFP (MSAFP) levels are characteristically **decreased**, not increased. In Down Syndrome, the "Triple Test" typically shows low AFP, low unconjugated estriol (uE3), and high hCG. **Why the other options are incorrect (Conditions with Increased AFP):** AFP levels increase whenever there is a defect in the fetal barrier (skin or epithelium) that allows the protein to leak into the amniotic fluid and maternal circulation. * **Exomphalos (Omphalocele) & Cloacal Exstrophy:** These are ventral wall defects. The absence of integumentary coverage over the abdominal viscera allows massive leakage of AFP. * **Tracheoesophageal Fistula (TEF):** Any gastrointestinal obstruction or fistula interferes with the fetal swallowing and digestion of amniotic fluid (which contains AFP), leading to elevated levels in the amniotic sac and maternal serum. **NEET-PG High-Yield Pearls:** * **Most common cause of increased MSAFP:** Incorrect gestational age estimation (dating error). * **Other causes of increased AFP:** Neural tube defects (Anencephaly, Spina bifida), Multiple gestations, Renal anomalies (Finnish-type nephrosis), and Fetal demise. * **Mnemonic for Low AFP:** "**D**own **E**very **A**nd **P**eaceful" (**D**own syndrome, **E**dwards syndrome, **A**bnormal pregnancy/Molar, **P**aternal obesity).

Q: True about Braxton Hicks' contractions are all, except?

Painful. **Explanation:** Braxton Hicks contractions are intermittent, spontaneous, non-rhythmic uterine contractions that occur during pregnancy. The hallmark of these contractions is that they are **painless**. **1. Why "Painful" is the correct answer (the exception):** Braxton Hicks contractions are characterized by a tightening sensation in the abdomen but do not cause cervical dilatation or effacement. Unlike true labor pains, they are **painless**, irregular in frequency, and usually subside with rest or hydration. If contractions become painful and regular, they may indicate preterm or true labor. **2. Analysis of other options:** * **Felt at 4th month:** These contractions start early in pregnancy (around 6 weeks) but are generally not palpable or felt by the mother until the second trimester, typically around the **4th month (16 weeks)**. * **Contractions last for 1 min:** A typical Braxton Hicks contraction lasts approximately **30 to 60 seconds**, though they can occasionally last up to 2 minutes. * **Present even when fetus is dead:** These are intrinsic myometrial activities. Since they are independent of fetal life or movements, they persist even in cases of **Intrauterine Fetal Death (IUFD)**. **Clinical Pearls for NEET-PG:** * **Distinguishing Feature:** Braxton Hicks contractions disappear with walking or sedation, whereas true labor pains intensify. * **Physiological Role:** They are thought to help in the "ripening" of the cervix and maintaining uterine blood flow. * **False Labor:** When Braxton Hicks contractions become frequent and uncomfortable near term, they are often referred to as "False Labor."

Q: Which of the following first-trimester obstetrical signs is FALSE?

Chadwick's sign is regular rhythmic uterine contraction seen as early as 4-6 weeks of pregnancy.. The correct answer is **A** because the description provided for Chadwick’s sign is incorrect. **Chadwick’s sign** is actually a bluish discoloration of the cervix, vagina, and labia caused by increased vascularity (venous congestion), typically appearing around 6–8 weeks. The description of "regular rhythmic uterine contractions" actually refers to **Palmer’s sign**, which can be felt during a bimanual examination as early as 4–8 weeks. ### Explanation of Other Options: * **Goodell’s sign (Option B):** This refers to the significant softening of the cervix due to increased vascularity and edema. In a non-pregnant state, the cervix feels like the tip of the nose; in pregnancy, it feels like the lips. This is a correct clinical finding at 6 weeks. * **Osiander’s sign (Option C):** This is the perception of increased pulsations in the lateral vaginal fornices due to the enlargement and increased blood flow of the uterine arteries. It is correctly noted at approximately 8 weeks. * **Hegar’s sign (Option D):** This is a classic sign where the lower uterine segment (isthmus) becomes very soft, allowing the fingers of the internal and external hands to almost meet during bimanual palpation. It is a reliable sign appearing between 6–10 weeks. ### High-Yield Clinical Pearls for NEET-PG: * **Jacquemier’s Sign:** Another name for Chadwick’s sign (bluish discoloration of the vestibule/anterior vaginal wall). * **Piskacek’s Sign:** Asymmetrical enlargement of the uterus if implantation occurs near one of the cornua. * **Ladins Sign:** Softening of the uterus in the anterior midline at the junction of the uterus and cervix (6 weeks). * **Von Fernwald's Sign:** Irregular softening of the fundus over the site of implantation.

Question 1

Alpha-fetoprotein levels are increased in all EXCEPT:

Accepted Answer

Down syndrome

Answer

Open neural tube defects

Answer

Twin pregnancy

Answer

Intrauterine death

Question 2

In which type of abortion does the gestational age correspond to the uterine size?

Accepted Answer

Threatened

Answer

Inevitable

Answer

Complete

Answer

Missed

Question 3

A 28-year-old primigravida has a pre-pregnancy BMI of 30 kg/m². What is the recommended weight gain for her during pregnancy?

Accepted Answer

5-7 kg

Answer

8-11 kg

Answer

10-13 kg

Answer

14-16 kg

Question 4

A 22-year-old female on antiepileptic therapy got married. When should folic acid supplementation be advised to this female?

Accepted Answer

All women who could become pregnant

Answer

3 months before pregnancy

Answer

As soon as pregnancy is confirmed

Answer

After delivery

Question 5

Low MSAFP is seen in all of the following except?

Accepted Answer

Neural tube defect

Answer

Trisomy 21

Answer

Skeletal deformity

Answer

Cardiac anomaly

Question 6

All of the following are commonly used for estimation of gestational age in mid-trimester EXCEPT?

Accepted Answer

Crown Rump Length

Answer

Biparietal diameter

Answer

Abdominal circumference of fetus

Answer

Femur length

Question 7

In Down's syndrome, what are the typical serum markers and nuchal translucency (NT) findings?

Accepted Answer

Decreased MSAFP, PAPP-A and UE3 and Increased hCG, NT > 3mm

Answer

Increased MSAFP and UE3, Decreased PAPP-A and hCG, NT < 3mm

Answer

Decreased MSAFP, PAPP-A, UE3 and hCG, NT > 3mm

Answer

Increased MSAFP, UE3, PAPP-A and hCG, NT < 3mm

Question 8

Alpha-fetoprotein levels are increased in all of the following conditions except:

Accepted Answer

Chromosomal trisomy

Answer

Cloacal exstrophy

Answer

Exomphalos

Answer

Tracheoesophageal fistula

Question 9

True about Braxton Hicks' contractions are all, except?

Accepted Answer

Painful

Answer

Felt at 4th month

Answer

Contractions last for 1 min

Answer

Present even when fetus is dead

Question 10

Which of the following first-trimester obstetrical signs is FALSE?

Accepted Answer

Chadwick's sign is regular rhythmic uterine contraction seen as early as 4-6 weeks of pregnancy.

Answer

Goodell's sign is a soft cervix seen as early as 6 weeks.

Answer

Osiander's sign is pulsation in the lateral vaginal fornix seen as early as 8 weeks.

Answer

Hegar's sign is a reliable sign seen as early as 6-10 weeks.

Prenatal Care — MCQs

Prenatal Care — MCQs

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