Endocrinology Practice Questions

Q: A 45-year-old patient has a Fasting Blood Sugar (FBS) of 111 mg/dL, Postprandial Blood Sugar (PPBS) of 181 mg/dL, and HbA1c of 6.1%. What is the diagnosis?

Pre-diabetes. ### Explanation The diagnosis of **Pre-diabetes** (also known as Intermediate Hyperglycemia) is based on blood glucose levels that are higher than normal but do not yet meet the threshold for a diagnosis of Diabetes Mellitus [1]. According to the American Diabetes Association (ADA) criteria, a patient is diagnosed with pre-diabetes if they meet **any** of the following: 1. **Impaired Fasting Glucose (IFG):** FBS between 100–125 mg/dL. (Patient: 111 mg/dL) [1] 2. **Impaired Glucose Tolerance (IGT):** 2-hour post-load glucose (OGTT) or PPBS between 140–199 mg/dL. (Patient: 181 mg/dL) [1] 3. **HbA1c:** Between 5.7% and 6.4%. (Patient: 6.1%) Since all three parameters in this patient fall within these specific ranges, the diagnosis is Pre-diabetes. [1] **Why other options are incorrect:** * **Type 2 & Type 1 Diabetes Mellitus:** Diagnosis requires FBS ≥126 mg/dL, PPBS/Random ≥200 mg/dL, or HbA1c ≥6.5% [1]. This patient’s values are below these cut-offs. * **Stress Hyperglycemia:** This refers to transiently elevated glucose levels (usually >140 mg/dL) during acute illness or physiological stress in patients without prior diabetes. While the sugars are elevated here, the HbA1c of 6.1% indicates a chronic state of dysglycemia rather than an acute spike. **High-Yield Clinical Pearls for NEET-PG:** * **Normal Values:** FBS <100 mg/dL, 2hr-PPBS <140 mg/dL, HbA1c <5.7%. * **Screening:** In asymptomatic adults, screening for pre-diabetes/diabetes should begin at age 35 (recently lowered from 45). * **Management:** Lifestyle modification (weight loss and exercise) is the first-line treatment. Metformin is considered for high-risk pre-diabetics (BMI ≥35, age <60, or women with prior GDM).

Q: Pituitary adenomas are regarded as macroadenomas when their size is:

> 1 cm. Pituitary adenomas are benign tumors of the anterior pituitary gland and are classified primarily based on their size, which dictates both clinical presentation and surgical approach. **1. Why the correct answer is right:** The standard radiological classification (based on MRI findings) divides pituitary adenomas into two categories [3]: * **Microadenomas:** 1 cm (10 mm)** in diameter [3]. These are significant because they are large enough to compress adjacent structures, such as the optic chiasm (causing bitemporal hemianopia) or the normal pituitary tissue (causing hypopituitarism) [2], [4]. **2. Why the incorrect options are wrong:** * **Options B, C, and D (> 1.5 cm, > 2 cm, > 2.5 cm):** While these sizes technically qualify as macroadenomas, they do not represent the established diagnostic threshold. A tumor is labeled a macroadenoma the moment it exceeds the 1 cm mark [3]. Tumors exceeding 4 cm are specifically termed **Giant Pituitary Adenomas**. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common type:** Prolactinoma is the most common secretory pituitary adenoma. * **Mass Effect:** Macroadenomas typically present with the "classic triad": Headache, bitemporal hemianopia (due to optic chiasm compression), and hypopituitarism [2]. * **Imaging Gold Standard:** Contrast-enhanced MRI of the Sella Turcica [3]. * **Treatment:** For most macroadenomas, **Transsphenoidal surgery** is the first-line treatment [1], *except* for Prolactinomas, where medical management (Dopamine agonists like Cabergoline) is preferred regardless of size [2], [4].

Q: A 45-year-old female presents with symptoms of thyrotoxicosis. The RAIU scan shows increased uptake. Which of the following is the most likely diagnosis?

Choriocarcinoma. The clinical presentation of thyrotoxicosis with **increased Radioactive Iodine Uptake (RAIU)** indicates that the thyroid gland is actively synthesizing new thyroid hormone (hyperthyroidism). [1] **Why Choriocarcinoma is correct:** Choriocarcinoma is a germ cell tumor that secretes extremely high levels of **human chorionic gonadotropin (hCG)**. The alpha-subunit of hCG is identical to that of **TSH**. At very high concentrations, hCG cross-reacts with TSH receptors in the thyroid gland, stimulating thyroid hormone production and increasing iodine trapping. This results in a high RAIU scan, similar to Graves' disease but without the ophthalmopathy. [2] **Why the other options are incorrect:** * **Hashimoto’s Thyroiditis:** Typically presents with hypothyroidism. During the initial "Hashitoxicosis" phase, thyrotoxicosis occurs due to the release of pre-formed hormones from gland destruction, resulting in **low/decreased RAIU**. [1] * **Struma Ovarii:** This is ectopic thyroid tissue within an ovarian teratoma. While it causes thyrotoxicosis, the iodine uptake occurs in the pelvis. The **neck RAIU scan will be low** because the endogenous TSH is suppressed. * **Thyrotoxicosis Factitia:** Caused by the exogenous ingestion of thyroid hormones. Since the thyroid gland is suppressed by the external hormone, the **RAIU scan will be low/absent**. [1] **High-Yield Clinical Pearls for NEET-PG:** * **High RAIU (>30%):** Graves’ Disease, Toxic Multinodular Goiter, Toxic Adenoma, TSH-secreting pituitary adenoma, and hCG-mediated thyrotoxicosis (Choriocarcinoma/Hydatidiform mole). [3] * **Low RAIU (<5%):** Thyroiditis (Subacute, Silent, Hashimoto's), Iodine overload (Jod-Basedow), Factitious thyrotoxicosis, and Ectopic thyroid (Struma ovarii). [1] * **Key Concept:** If thyrotoxicosis is present but the neck scan is "cold," always consider thyroiditis or an extrathyroidal source.

Q: Which of the following is NOT a feature of primary hyperaldosteronism?

Hyperkalemia. Primary Hyperaldosteronism (Conn’s Syndrome) is characterized by the autonomous overproduction of aldosterone, typically due to an adrenal adenoma or bilateral adrenal hyperplasia. **Why Hyperkalemia is the Correct Answer:** Aldosterone acts on the principal cells of the renal collecting ducts to increase the reabsorption of sodium and the **secretion of potassium and hydrogen ions** into the urine [1]. Consequently, excessive aldosterone leads to **hypokalemia**, not hyperkalemia [3]. Therefore, hyperkalemia is the "odd one out" and the correct answer. **Analysis of Other Options:** * **Hypertension:** Increased sodium reabsorption leads to water retention and expansion of extracellular fluid volume, resulting in hypertension [2]. Notably, this is often resistant to standard therapy. * **Hypokalemia:** As explained, increased renal potassium excretion leads to low serum potassium levels [3]. This can manifest as muscle weakness or cardiac arrhythmias. * **Polyuria:** Chronic hypokalemia can cause "hypokalemic nephropathy," which impairs the kidney's ability to concentrate urine (nephrogenic diabetes insipidus), leading to polyuria and polydipsia. **High-Yield Clinical Pearls for NEET-PG:** * **Screening Test:** Plasma Aldosterone Concentration (PAC) to Plasma Renin Activity (PRA) ratio. A ratio **>20-30** is highly suggestive. * **Confirmatory Test:** Oral or Intravenous Salt Loading Test (failure to suppress aldosterone). * **Metabolic State:** Patients typically exhibit **Metabolic Alkalosis** (due to $H^+$ loss) [1], [3]. * **Aldosterone Escape:** Edema is usually absent in primary hyperaldosteronism because of "atrial natriuretic peptide (ANP) mediated diuresis," which prevents massive fluid overload [2].

Q: Which of the following statements regarding the treatment of hypothyroidism in a patient with ischemic heart disease is true?

Low dose of Levothyroxine. ### Explanation **Core Concept:** In patients with hypothyroidism and concurrent **Ischemic Heart Disease (IHD)**, thyroid hormone replacement must be initiated with extreme caution. Levothyroxine increases the metabolic rate, oxygen consumption, and myocardial contractility [1]. In a heart with compromised coronary circulation, a sudden increase in cardiac demand can precipitate **angina, myocardial infarction, or fatal arrhythmias.** [1] **Why Option A is Correct:** The standard protocol for elderly patients or those with IHD is to **"Start Low and Go Slow."** The typical starting dose is **12.5 to 25 µg/day**, which is significantly lower than the standard replacement dose [2]. The dose is then titrated upwards in small increments every 4–6 weeks based on clinical response and TSH levels to allow the myocardium to adapt to the increased metabolic demand [2]. **Why Other Options are Incorrect:** * **Option B (Normal dose):** A full replacement dose (approx. 1.6 µg/kg) can cause a rapid increase in heart rate and stroke volume, potentially leading to an acute coronary syndrome or heart failure [2]. * **Option C (Do not use):** Untreated hypothyroidism itself worsens cardiovascular risk factors (dyslipidemia, hypertension) and can lead to myxedema coma. Treatment is necessary but must be cautious. * **Option D (Thyroid extract):** Desiccated thyroid extracts contain T3, which has a rapid onset and can cause "peaks" in hormone levels, making it much more dangerous for the heart than the stable T4 (Levothyroxine). **High-Yield Clinical Pearls for NEET-PG:** * **Standard Starting Dose (Healthy Adult):** 1.6 µg/kg/day. * **Starting Dose (IHD/Elderly):** 12.5–25 µg/day [2]. * **Monitoring:** TSH is the gold standard; check 6–8 weeks after any dose adjustment [2]. * **Drug Interaction:** Levothyroxine increases the effect of Warfarin (monitor PT/INR) and may require an increase in Insulin/Oral Hypoglycemic doses.

Q: Peripheral nerve involvement, presenting as pain, paresthesia, motor weakness, and reflex loss, develops in a significant percentage of patients with which of the following conditions?

Diabetes mellitus. **Explanation:** **Diabetes Mellitus (DM)** is the most common cause of peripheral neuropathy worldwide. The pathogenesis involves chronic hyperglycemia leading to the accumulation of sorbitol (via the polyol pathway), advanced glycation end-products (AGEs), and increased oxidative stress. These factors cause microvascular damage to the *vasa nervorum*, leading to nerve ischemia. The classic presentation is a **Symmetric Distal Sensorimotor Polyneuropathy** ("stocking-and-glove" distribution), characterized by pain, paresthesia, loss of vibration/proprioception, and diminished deep tendon reflexes (especially the ankle jerk). **Why other options are incorrect:** * **Hypoparathyroidism:** Primarily presents with features of hypocalcemia, such as tetany, carpopedal spasm, and seizures. While it causes neuromuscular irritability (Chvostek/Trousseau signs), it does not typically cause structural peripheral nerve degeneration or motor weakness. * **Adrenal Insufficiency:** Presents with hypotension, hyperpigmentation, and electrolyte imbalances (hyponatremia, hyperkalemia). It does not involve peripheral nerve pathology. * **Hyperthyroidism:** More commonly associated with **proximal myopathy** (weakness of hip/shoulder girdles) rather than peripheral neuropathy. Reflexes in hyperthyroidism are characteristically "brisk" or hyperreflexic, not lost. **High-Yield Clinical Pearls for NEET-PG:** * **Mononeuritis Multiplex:** DM is a leading cause; it involves the involvement of two or more non-contiguous nerve trunks. * **Diabetic Amyotrophy:** A plexopathy presenting as severe pain followed by weakness and wasting of the proximal thigh muscles. * **Cranial Nerve Involvement:** The **3rd Cranial Nerve** is most commonly affected in DM, typically presenting with **pupillary sparing** (due to ischemic rather than compressive injury).

Q: A 46-year-old woman with hypertension and diabetes mellitus type II presents with elevated blood pressure despite diet and exercise. She is taking metformin for her diabetes. Her vital signs are: temperature 37°C (98.6°F), blood pressure 146/72 mmHg, pulse 76/min, respirations 16/min, and oxygen saturation 98% on room air. Which of the following medications is most likely to be prescribed?

Lisinopril. **Explanation:** The correct answer is **Lisinopril (Option C)**. **Why Lisinopril is the drug of choice:** In patients with **Diabetes Mellitus and Hypertension**, ACE inhibitors (like Lisinopril) or ARBs are the first-line antihypertensive agents. The underlying medical concept is **renoprotection**. ACE inhibitors reduce intraglomerular pressure by dilating the efferent arteriole, thereby slowing the progression of diabetic nephropathy and reducing albuminuria. Even in the absence of overt proteinuria, they are preferred in diabetics to prevent chronic kidney disease (CKD). **Why the other options are incorrect:** * **Amlodipine (Option A):** While Calcium Channel Blockers (CCBs) are effective antihypertensives, they do not offer the same level of renal protection as ACE inhibitors in diabetic patients. They are typically used as second-line or add-on therapy. * **Furosemide (Option B):** Loop diuretics are primarily used for fluid overload states (e.g., heart failure, edema) rather than primary hypertension management, unless the patient has advanced CKD (GFR <30). * **Spironolactone (Option D):** This potassium-sparing diuretic is generally reserved for resistant hypertension or primary aldosteronism. It is not a first-line agent for uncomplicated diabetic hypertension. **Clinical Pearls for NEET-PG:** * **Target BP in Diabetes:** According to most guidelines (ADA/JNC), the target is generally **<130/80 mmHg**. * **Monitoring:** Always check serum **creatinine and potassium** levels within 1-2 weeks of starting an ACE inhibitor. A rise in creatinine up to 30% is acceptable. * **Contraindication:** ACE inhibitors are strictly **contraindicated in pregnancy** (teratogenic) and in patients with bilateral renal artery stenosis. * **Side Effect:** The most common side effect of ACE inhibitors is a **dry cough** (due to bradykinin accumulation); if this occurs, switch the patient to an ARB (e.g., Losartan).

Q: Which of the following is a microvascular complication of diabetes mellitus?

Retinopathy. Chronic hyperglycemia in diabetes mellitus leads to vascular damage categorized into two main types: **Microvascular** (affecting small capillaries) and **Macrovascular** (affecting large arteries) [1]. **Why Retinopathy is Correct:** Diabetic retinopathy is the classic hallmark of **microvascular** disease. It occurs due to basement membrane thickening, loss of pericytes, and increased capillary permeability in the retinal vessels [1]. This leads to microaneurysms, hemorrhages, and neovascularization [3]. Other primary microvascular complications include **Nephropathy** and **Neuropathy**. **Analysis of Incorrect Options:** * **Coronary circulation (B):** This is a **macrovascular** complication. Macrovascular disease involves atherosclerosis of large vessels, leading to Coronary Artery Disease (CAD), Stroke (Cerebrovascular disease), and Peripheral Arterial Disease (PAD) [1]. * **Peripheral (A) and Autonomic (D) Neuropathy:** While these are microvascular in origin (due to ischemia of the *vasa nervorum*), in the context of standard medical examinations and the "classic triad" of diabetic complications, **Retinopathy, Nephropathy, and Neuropathy** are all microvascular [1], [4]. However, if a single best answer must be chosen among these, Retinopathy is the most direct clinical manifestation of small-vessel damage. *Note: In many MCQ formats, if multiple microvascular options are present, the question may be flawed or looking for the "most" characteristic one.* **High-Yield Clinical Pearls for NEET-PG:** * **Earliest sign of Nephropathy:** Microalbuminuria (30–300 mg/day). * **Earliest sign of Retinopathy:** Microaneurysms [3]. * **Kimmelstiel-Wilson (KW) lesions:** Pathognomonic for diabetic nephropathy (nodular glomerulosclerosis). * **Metabolic Memory:** Early glycemic control prevents long-term microvascular complications even if control worsens later [2].

Question 1

Manifestations of endemic cretinism include:

Accepted Answer

Strabismus and spastic diplegias

Answer

Deafness and facial nerve involvement

Answer

Blindness and hypothyroidism

Answer

Multinodular goitre and mental retardation

Question 2

Albright's syndrome includes all except?

Accepted Answer

Patchy pigmentation

Answer

Polyostotic fibrous dysplasia

Answer

Precocious puberty in girls

Answer

Pseudohypoparathyroidism

Question 3

A 45-year-old patient has a Fasting Blood Sugar (FBS) of 111 mg/dL, Postprandial Blood Sugar (PPBS) of 181 mg/dL, and HbA1c of 6.1%. What is the diagnosis?

Accepted Answer

Pre-diabetes

Answer

Type 2 Diabetes Mellitus

Answer

Type 1 Diabetes Mellitus

Answer

Stress hyperglycemia

Question 4

Pituitary adenomas are regarded as macroadenomas when their size is:

Accepted Answer

> 1 cm

Answer

> 1.5 cm

Answer

> 2 cm

Answer

> 2.5 cm

Question 5

A 45-year-old female presents with symptoms of thyrotoxicosis. The RAIU scan shows increased uptake. Which of the following is the most likely diagnosis?

Accepted Answer

Choriocarcinoma

Answer

Hashimoto's thyroiditis

Answer

Struma ovarii

Answer

Thyrotoxicosis factitia

Question 6

Which of the following is NOT a feature of primary hyperaldosteronism?

Accepted Answer

Hyperkalemia

Answer

Polyuria

Answer

Hypertension

Answer

Hypokalemia

Question 7

Which of the following statements regarding the treatment of hypothyroidism in a patient with ischemic heart disease is true?

Accepted Answer

Low dose of Levothyroxine

Answer

Normal dose of Levothyroxine

Answer

Do not use Levothyroxine

Answer

Use thyroid extract

Question 8

Peripheral nerve involvement, presenting as pain, paresthesia, motor weakness, and reflex loss, develops in a significant percentage of patients with which of the following conditions?

Accepted Answer

Diabetes mellitus

Answer

Hypoparathyroidism

Answer

Adrenal insufficiency

Answer

Hyperthyroidism

Question 9

A 46-year-old woman with hypertension and diabetes mellitus type II presents with elevated blood pressure despite diet and exercise. She is taking metformin for her diabetes. Her vital signs are: temperature 37°C (98.6°F), blood pressure 146/72 mmHg, pulse 76/min, respirations 16/min, and oxygen saturation 98% on room air. Which of the following medications is most likely to be prescribed?

Accepted Answer

Lisinopril

Answer

Amlodipine

Answer

Furosemide

Answer

Spironolactone

Question 10

Which of the following is a microvascular complication of diabetes mellitus?

Accepted Answer

Retinopathy

Answer

Peripheral neuropathy

Answer

Coronary circulation

Answer

Autonomic neuropathy

Endocrinology — MCQs

Endocrinology — MCQs

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