Endocrinology of Pregnancy — MCQs

Endocrinology of Pregnancy Indian Medical PG Practice Questions and MCQs

Question 231: Which of the following changes occurs in pregnancy?

A. Plasma fibrinogen levels are increased (Correct Answer)
B. Fibrinogen levels are decreased
C. Thyroglobulins are decreased
D. IgD are markedly increased

Explanation: **Explanation:** Pregnancy is characterized by significant physiological adaptations to prepare for the challenges of delivery, most notably the risk of postpartum hemorrhage. **1. Why Option A is Correct:** Pregnancy induces a **hypercoagulable state**. There is a marked increase in several clotting factors, most significantly **Fibrinogen (Factor I)**. Plasma fibrinogen levels rise by approximately 50%, increasing from non-pregnant levels of 200–400 mg/dL to **400–600 mg/dL** by the third trimester. This serves as a protective mechanism to facilitate rapid hemostasis during placental separation. **2. Why the Other Options are Incorrect:** * **Option B:** Fibrinogen levels **increase**, not decrease. A "normal" non-pregnant fibrinogen level in a pregnant woman (e.g., <200 mg/dL) may actually indicate a pathological state like DIC or abruptio placentae. * **Option C:** Estrogen stimulates the liver to increase the production of **Thyroxine-Binding Globulin (TBG)**. Consequently, total T3 and T4 levels increase, though free T3 and T4 remain largely unchanged (euthyroid state). * **Option D:** While there are complex immunological shifts (moving toward a Th2-mediated response to protect the fetus), **IgD levels remain unchanged** or may slightly decrease. There is no "marked increase" in IgD during pregnancy. **High-Yield Clinical Pearls for NEET-PG:** * **Coagulation:** Factors VII, VIII, IX, X, and XII also increase. However, **Factors XI and XIII decrease**. * **Anticoagulants:** Protein S levels decrease, and there is increased resistance to Activated Protein C (APC). * **ESR:** Due to the rise in fibrinogen, the **Erythrocyte Sedimentation Rate (ESR) increases** significantly in pregnancy, making it an unreliable marker for infection. * **Platelets:** There is a slight decrease in platelet count due to hemodilution and increased consumption (Gestational Thrombocytopenia).

Question 232: A class C diabetic patient delivers at term. It is important to check her blood sugar levels immediately postpartum, as there may be a decrease in the insulin requirements of diabetic patients. This can be partly explained by:

A. Increased food intake
B. Decreased activity
C. Decrease in plasma chorionic somatomammotropin (Correct Answer)
D. All of the above

Explanation: ### Explanation **1. Why Option C is Correct:** The primary reason for the precipitous drop in insulin requirements immediately postpartum is the **removal of the placenta**. During pregnancy, the placenta produces several "diabetogenic" hormones, the most potent being **Human Placental Lactogen (hPL)**, also known as **Human Chorionic Somatomammotropin (hCS)**. hCS induces peripheral insulin resistance and increases lipolysis to ensure a steady glucose supply to the fetus. Once the placenta is delivered, the levels of hCS (along with placental growth hormone, cortisol, and progesterone) drop rapidly. This sudden withdrawal of insulin-antagonistic hormones restores maternal insulin sensitivity, often leading to a "honeymoon period" where insulin requirements may fall to 50% of pre-pregnancy doses or even zero temporarily. **2. Why Other Options are Incorrect:** * **Option A (Increased food intake):** Increased caloric intake would typically *increase* the need for insulin, not decrease it. * **Option B (Decreased activity):** Physical inactivity generally increases insulin resistance and blood glucose levels, which would necessitate *more* insulin, not less. **3. Clinical Pearls for NEET-PG:** * **The "Diabetogenic" State:** Pregnancy is naturally a state of insulin resistance, peaking in the **3rd trimester** due to hCS. * **Postpartum Management:** In Type 1 DM, insulin dosage should be reduced immediately to roughly **half of the end-of-pregnancy dose** to avoid hypoglycemia. * **GDM Follow-up:** Patients with Gestational Diabetes (GDM) should undergo a **75g OGTT at 6–12 weeks postpartum** to screen for persistent Type 2 Diabetes. * **hCS Function:** It is structurally similar to Growth Hormone and Prolactin; its primary role is maternal metabolic adaptation to ensure fetal nutrition.

Question 233: Which of the following is a false physical parameter during pregnancy?

A. It's a prothrombotic condition
B. Blood fibrinogen levels are increased
C. Clotting and bleeding times are reduced (Correct Answer)
D. There is lowering of serum protein levels

Explanation: ### Explanation **1. Why Option C is the Correct (False) Statement:** In pregnancy, despite the significant increase in various clotting factors, the **Bleeding Time (BT)** and **Clotting Time (CT)** remain **unchanged**. These parameters are measures of platelet function and the intrinsic/extrinsic pathways in a controlled setting; they do not decrease because the body maintains a physiological balance to prevent spontaneous thrombosis while preparing for the hemostatic challenge of delivery. **2. Analysis of Other Options:** * **Option A (Prothrombotic condition):** This is **True**. Pregnancy is a state of "compensated intravascular coagulation." There is an increase in procoagulants and a decrease in natural anticoagulants (like Protein S) and fibrinolytic activity, leading to a 5-10 fold increased risk of thromboembolism. * **Option B (Increased Fibrinogen):** This is **True**. Plasma fibrinogen (Factor I) increases significantly (up to 50%), rising from non-pregnant levels of 200–400 mg/dL to 400–600 mg/dL. This is a protective mechanism against postpartum hemorrhage. * **Option C (Lowering of serum protein):** This is **True**. Total serum protein levels drop (from 7g/dL to ~6g/dL). This is primarily due to hemodilution and a significant fall in **Albumin**, which leads to a decrease in colloid osmotic pressure (contributing to physiological edema). **3. High-Yield NEET-PG Clinical Pearls:** * **Factors that INCREASE:** I, VII, VIII, IX, X, and XII. * **Factors that DECREASE:** XI and XIII. * **Factors that remain UNCHANGED:** II (Prothrombin), V, BT, and CT. * **ESR:** Markedly increases during pregnancy due to increased fibrinogen and globulin levels (not useful for diagnosing infection). * **Platelet Count:** May show a slight decrease (Gestational Thrombocytopenia) due to hemodilution and increased consumption.

Question 234: What is the typical pH of the vagina during pregnancy?

A. 4.5 (Correct Answer)
B. 7.0
C. 8.5
D. 11.0

Explanation: **Explanation:** The correct answer is **A. 4.5**. During pregnancy, the vaginal environment becomes significantly more acidic, typically ranging from **3.5 to 6.0**. This change is driven by high levels of circulating **estrogen**, which increases the deposition of **glycogen** in the vaginal squamous epithelium. *Lactobacillus acidophilus* (Döderlein’s bacilli) ferments this glycogen into **lactic acid**, thereby lowering the pH. This acidic environment serves as a critical innate immune mechanism, inhibiting the growth of pathogenic bacteria and protecting both the mother and the fetus from ascending infections. **Analysis of Incorrect Options:** * **B (7.0):** This is a neutral pH. A neutral or alkaline pH in the vagina is abnormal and often seen in conditions like Bacterial Vaginosis (pH > 4.5) or Trichomoniasis. * **C (8.5) & D (11.0):** These are strongly alkaline values. Such high pH levels are not physiological in the human vagina and would indicate severe pathology or the presence of amniotic fluid (which is alkaline, pH 7.0–7.5), often used as a diagnostic marker for Premature Rupture of Membranes (PROM) via the Nitrazine test. **High-Yield Clinical Pearls for NEET-PG:** * **Glycogen & Estrogen:** Estrogen → ↑ Glycogen → ↑ Lactic Acid (via Lactobacilli) → ↓ pH. * **Amniotic Fluid:** It is alkaline (pH 7.0–7.5). A shift from acidic to alkaline pH in the vagina is a classic sign of **PROM**. * **Infection Screening:** A vaginal pH > 4.5 in a non-pregnant or pregnant woman is a primary screening criterion for **Bacterial Vaginosis** (Amsel's Criteria). * **Candidiasis:** Unlike other infections, the vaginal pH remains **normal (< 4.5)** in Vulvovaginal Candidiasis.

Question 235: What is a common cardiovascular change observed during pregnancy?

A. Slight right axis deviation in ECG
B. Slight left axis deviation in ECG (Correct Answer)
C. Diastolic murmur
D. Pulse rate is decreased

Explanation: ### Explanation During pregnancy, the cardiovascular system undergoes significant anatomical and physiological adaptations to accommodate the growing fetus. **Why Option B is Correct:** As the uterus enlarges, it pushes the diaphragm upward. This elevation causes the heart to shift **upward and to the left**, rotating on its long axis. Consequently, the apex beat is displaced to the 4th intercostal space, lateral to the mid-clavicular line. On an ECG, this physical displacement manifests as a **slight left axis deviation (LAD)**. **Analysis of Incorrect Options:** * **A. Slight right axis deviation:** This is incorrect because the anatomical shift is superior and lateral (left), not rightward. * **C. Diastolic murmur:** While a **systolic flow murmur** (Grade I or II) is considered physiological in over 90% of pregnant women due to increased cardiac output and decreased blood viscosity, a **diastolic murmur is always pathological** and requires further investigation (e.g., echocardiography). * **D. Pulse rate is decreased:** This is incorrect. The resting heart rate typically **increases** by 10–15 beats per minute to meet the increased metabolic demands and higher cardiac output. **High-Yield NEET-PG Pearls:** * **Cardiac Output:** Increases by 30–50%, peaking at 28–32 weeks of gestation. * **Blood Pressure:** Systolic and diastolic BP decrease in the first and second trimesters (nadir at 20–24 weeks) due to decreased systemic vascular resistance (SVR), returning to pre-pregnancy levels by term. * **ECG Changes:** Besides LAD, you may see flattened or inverted T-waves in Lead III and Q-waves in Lead III and aVF (positional changes). * **Heart Sounds:** Loud S1 and a physiological S3 are common; S4 is rare and usually pathological.

Question 236: What is the target glycosylated hemoglobin level for a normal pregnant lady?

A. 4.50%
B. 5.50%
C. 6.50% (Correct Answer)
D. 7.50%

Explanation: **Explanation:** In the context of pregnancy, maintaining optimal glycemic control is crucial to prevent maternal and fetal complications. For a **normal pregnant woman** (or those with pre-gestational diabetes planning pregnancy), the target **HbA1c (Glycosylated Hemoglobin) is <6.5%**. **Why 6.5% is the correct answer:** HbA1c reflects the average blood glucose over the preceding 8–12 weeks. In pregnancy, there is an increase in red blood cell turnover, which naturally lowers HbA1c levels compared to non-pregnant states. A target of **<6.5%** is established as the threshold to minimize the risk of congenital malformations (like sacral agenesis or cardiac defects) and obstetric complications like macrosomia and pre-eclampsia. While some guidelines suggest an even stricter target of <6.0% if achievable without hypoglycemia, **6.5%** remains the standard diagnostic and management benchmark in most clinical examinations. **Analysis of Incorrect Options:** * **A (4.50%) & B (5.50%):** These values are within the normal range for non-diabetic individuals. While "lower is better" generally applies, targets this low are not clinically set as the "standard target" because they significantly increase the risk of maternal hypoglycemia. * **D (7.50%):** This level is too high for pregnancy. An HbA1c >7% is associated with a significantly increased risk of spontaneous abortion and major congenital anomalies. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for Monitoring:** While HbA1c is used for long-term control, **Self-Monitoring of Blood Glucose (SMBG)** is the preferred method for daily management in pregnancy. * **Target Blood Glucose:** Fasting <95 mg/dL; 1-hour postprandial <140 mg/dL; 2-hour postprandial <120 mg/dL. * **Most Common Malformation:** Ventricular Septal Defect (VSD). * **Most Specific Malformation:** Caudal Regression Syndrome (Sacral Agenesis).

Question 237: What is the hormonal check for pregnancy at home?

A. Beta-HCG (Correct Answer)
B. Estrogen
C. Progesterone
D. HPL

Explanation: ***Beta-HCG***- This hormone (specifically the **beta subunit of Human Chorionic Gonadotropin**) is detected by **home pregnancy test kits** in the urine, offering a simple and rapid test for confirming pregnancy.- It is produced by the **syncytiotrophoblast** cells after implantation and is the earliest reliable hormonal biomarker for clinically diagnosing pregnancy.*Estrogen*- While estrogen levels (e.g., **estriol**) increase significantly throughout pregnancy, they are not the hormone used for rapid, qualitative, early, **home-based detection**.- Estrogen levels fluctuate widely during the normal menstrual cycle, making it an unreliable early marker compared to HCG.*Progesterone*- Progesterone is essential for maintaining the uterine lining (**endometrium**) and supporting early pregnancy, but its measurement is typically reserved for evaluating **corpus luteum function** or threatened miscarriage.- Since progesterone levels rise naturally during the luteal phase of the regular cycle, it does not confirm pregnancy with the high specificity HCG offers.*HPL*- **Human Placental Lactogen (HPL)**, also known as **chorionic somatomammotropin**, is produced relatively later by the placenta.- Its primary role is in regulating maternal metabolism and fetal growth, and it is not typically detectable or useful for confirming a very **early home diagnosis** of pregnancy.

Question 238: Which of the following are correct about endocrine changes in normal pregnancy? 1. Increase in levels of maternal serum iodine 2. Increase in serum levels of Corticotropin-Releasing Hormone (CRH) 3. Increase in serum levels of aldosterone Select the answer using the code given below.

A. 1 and 2 only
B. 1 and 3 only
C. 2 and 3 only (Correct Answer)
D. 1, 2 and 3

Explanation: ***2 and 3 only*** - **Corticotropin-releasing hormone (CRH)** levels increase dramatically during pregnancy, produced by the **placenta**, influencing the timing of labor and fetal development. - **Aldosterone** levels significantly increase during pregnancy to help maintain **fluid balance** and counteract the natriuretic effects of increased progesterone and vasodilation. *1 and 2 only* - While CRH levels do increase, **maternal serum iodine levels do not increase**; rather, there is an increased demand for iodine and a decrease in serum iodine concentration due to increased renal clearance and transfer to the fetus. - This option incorrectly states an increase in maternal serum iodine. *1 and 3 only* - Although aldosterone levels increase, **maternal serum iodine levels do not increase** during normal pregnancy. - This option incorrectly implies an increase in serum iodine while correctly identifying an increase in aldosterone. *1, 2 and 3* - This option is incorrect because **maternal serum iodine levels do not increase** in normal pregnancy; instead, there is often a relative iodine deficiency due to increased demand and excretion. - Only CRH and aldosterone levels increase among the choices provided.

Question 239: The hormone Relaxin of pregnancy is secreted by:

A. Pituitary gland
B. Vagina
C. Ovary (Correct Answer)
D. Fallopian tube

Explanation: ***Ovary*** - During early pregnancy, **relaxin** is primarily produced by the **corpus luteum** in the ovary. - Subsequently, towards late pregnancy, the **decidua** and **placenta** also contribute to relaxin production. *Pituitary gland* - The **pituitary gland** produces hormones such as **FSH**, **LH**, **prolactin**, and **oxytocin**, but not relaxin. - These hormones play roles in **menstrual cycle regulation**, **lactation**, and **uterine contractions**. *Vagina* - The **vagina** is a muscular canal that serves as the birth canal; it does not produce hormones. - Its primary functions are in **sexual intercourse** and **childbirth**. *Fallopian tube* - The **fallopian tubes** are responsible for transporting eggs from the ovaries to the uterus and are sites of fertilization. - They do not have a role in the production of **pregnancy hormones** like relaxin.

Question 240: Consider the following statements regarding changes in pregnancy: 1. Plasma volume increases up to 30–50% 2. Pregnancy is a hypercoagulable state 3. Hematocrit is decreased 4. Total plasma protein concentration increases Which of the statements given above is/are correct?

A. 1 and 2 only
B. 1 only
C. 1, 2, 3 and 4
D. 3 and 4 only
E. 1, 2 and 3 only (Correct Answer)

Explanation: ***1, 2 and 3 only*** - **Statement 1 is correct**: Plasma volume increases significantly by **30-50%** during pregnancy, representing a key physiological adaptation. - **Statement 2 is correct**: Pregnancy is inherently a **hypercoagulable state** due to increased clotting factors (I, VII, VIII, IX, X, fibrinogen), decreased protein S, and reduced fibrinolysis—an adaptive mechanism to prevent excessive bleeding during delivery. - **Statement 3 is correct**: Hematocrit **decreases** due to physiological hemodilution; plasma volume increases proportionally more (40-50%) than red blood cell mass (20-30%), resulting in physiological anemia of pregnancy. - **Statement 4 is incorrect**: Total plasma protein concentration actually **decreases** during pregnancy (not increases) due to the hemodilution effect; albumin typically decreases from ~4.0 to ~3.0 g/dL. *1 and 2 only* - While statements 1 and 2 are correct, this option incorrectly excludes **statement 3 (decreased hematocrit)**, which is a well-established physiological change during pregnancy caused by hemodilution. *1 only* - Statement 1 is correct, but this option excludes both the **hypercoagulable state (statement 2)** and **decreased hematocrit (statement 3)**, which are both fundamental pregnancy-related changes. *1, 2, 3 and 4* - Statements 1, 2, and 3 are all correct. However, **statement 4 is incorrect** because total plasma protein concentration **decreases** (not increases) during pregnancy due to the disproportionate increase in plasma volume compared to protein synthesis. *3 and 4 only* - Statement 3 is correct, but **statement 4 is incorrect** (plasma protein concentration decreases, not increases). Additionally, this option incorrectly excludes statements 1 and 2, which are both correct and represent important physiological adaptations in pregnancy.

Practice by Chapter

Endocrine Changes in Normal Pregnancy

Practice Questions

Thyroid Disorders in Pregnancy

Practice Questions

Diabetes in Pregnancy

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Adrenal Disorders in Pregnancy

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Pituitary Disorders in Pregnancy

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Hyperemesis Gravidarum

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Hormonal Regulation of Labor

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Pharmacokinetics of Hormones in Pregnancy

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Fetal Endocrine Development

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Placental Hormones

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