Endocrinology Practice Questions

Q: Alkaline phosphatase levels are decreased in which of the following conditions?

Hypophosphatasia. Alkaline phosphatase (ALP) is an enzyme primarily found in the liver, bones, kidneys, and placenta. While elevated ALP is a common clinical finding, **decreased** ALP levels are rare and highly specific for certain conditions. **1. Why Hypophosphatasia is Correct:** Hypophosphatasia is a rare genetic metabolic disorder caused by a loss-of-function mutation in the **ALPL gene**, which encodes the **tissue-nonspecific alkaline phosphatase (TNSALP)** enzyme. This deficiency leads to the accumulation of substrates like inorganic pyrophosphate, which inhibits bone mineralization. Clinically, it manifests as rickets in children or osteomalacia in adults, characterized by low serum ALP levels [1]. **2. Why the Other Options are Incorrect:** * **Primary Biliary Cirrhosis (PBC):** This is a cholestatic liver disease. ALP is a marker of cholestasis; therefore, levels are significantly **elevated** due to increased synthesis and release from the bile duct epithelium. * **Hyperphosphatemia:** High serum phosphate levels do not directly cause low ALP. In fact, in conditions like chronic kidney disease (CKD) where hyperphosphatemia occurs, ALP is often **elevated** (Secondary Hyperparathyroidism). * **Hepatitis A:** Acute viral hepatitis causes hepatocellular injury, leading to an **increase** in ALP (though the rise in transaminases like ALT/AST is usually more prominent). **3. NEET-PG High-Yield Pearls:** * **Causes of Low ALP (Mnemonic: "MAPLE"):** **M**agnesium deficiency, **A**pastic anemia/Achondroplasia, **P**ernicious anemia (Vitamin B12 deficiency), **L**ow Zinc, **E**xcess Vitamin D intake/Hypothyroidism. * **Hypophosphatasia** is the most classic cause of low ALP tested in exams. * **Wilson’s Disease:** In cases of fulminant hepatic failure due to Wilson’s disease, a characteristic finding is a very low ALP to Bilirubin ratio.

Q: A 29-year-old male on oral hypoglycemic drugs has never experienced ketonuria. His BMI is 20.5. His grandfather had diabetes, but his father, who is his grandfather's only son, did not have the disease. Which type of diabetes mellitus is this person most likely to have?

Type 2 diabetes. The correct answer is **Type 2 Diabetes (D)**. **1. Why Type 2 Diabetes is correct:** The diagnosis is reached through a process of elimination and clinical pattern recognition. While the patient is young (29 years) and lean (BMI 20.5), the absence of ketonuria and the fact that he is managed on oral hypoglycemic drugs (OHAs) strongly point away from Type 1 Diabetes [1]. The key to this question lies in the **inheritance pattern**. The patient’s grandfather had diabetes, but his father did not. This represents **"skipped generation" inheritance**, which is characteristic of autosomal recessive or polygenic inheritance patterns often seen in Type 2 Diabetes [2]. **2. Why other options are incorrect:** * **MODY (B):** This is the most common distractor. MODY is characterized by **autosomal dominant** inheritance, meaning it typically presents in **every generation** (strong vertical transmission) [3]. Since the father was unaffected, MODY is statistically less likely than Type 2 DM. * **Type 1 Diabetes (C):** The patient is on OHAs and has **never experienced ketonuria**, which is the hallmark of absolute insulin deficiency [5]. Type 1 DM patients are ketosis-prone and insulin-dependent [1]. * **Pancreatic Diabetes (A):** This usually presents with a history of chronic pancreatitis (abdominal pain, steatorrhea) or pancreatic calcification on imaging [1]. There is no such clinical history provided. **3. NEET-PG High-Yield Pearls:** * **MODY:** Look for onset <25 years, non-obese, and **3 consecutive generations** affected (Autosomal Dominant) [3]. MODY 3 (HNF-1ʹ) is the most common subtype. * **Type 2 DM in Lean Individuals:** Common in the South Asian phenotype ("Thin-fat Indians") where visceral adiposity exists despite a low BMI. * **Ketonuria:** Its absence is a strong clinical indicator of residual beta-cell function, favoring Type 2 DM over Type 1 DM [4].

Q: Which screening test for diabetes has the highest sensitivity?

50gms glucose challenge test. **Explanation:** The **50g Glucose Challenge Test (GCT)** is the correct answer because it is specifically designed as a high-sensitivity screening tool, most notably used in gestational diabetes mellitus (GDM) [2]. Unlike diagnostic tests that prioritize specificity to avoid false positives, a screening test aims to identify as many potential cases as possible. The 50g GCT involves administering a glucose load regardless of the last meal and measuring plasma glucose one hour later; its low threshold for "positivity" ensures that very few cases are missed, giving it the **highest sensitivity** among the listed options. **Analysis of Incorrect Options:** * **Glycosylated Hb (HbA1c):** While convenient and used for diagnosis (threshold ≥6.5%), it has lower sensitivity compared to glucose-based tests. It can be falsely low in conditions with high red cell turnover (e.g., hemolytic anemia, pregnancy). * **Blood Fructosamine:** This reflects glycemic control over the past 2–3 weeks. It is useful when HbA1c is unreliable but is not a standard or highly sensitive screening tool for the general population. * **Random Blood Sugar (RBS):** This is the least sensitive and specific [1]. It is highly dependent on the timing and content of the last meal, making it an unreliable screening tool for early-stage diabetes. **Clinical Pearls for NEET-PG:** * **Gold Standard for Diagnosis:** The 75g Oral Glucose Tolerance Test (OGTT) is the gold standard for diagnosing DM and GDM (Carpenter-Coustan criteria) [3]. * **Screening vs. Diagnosis:** Screening (GCT) uses a 50g load; Diagnosis (OGTT) uses a 75g or 100g load. * **HbA1c Limitations:** HbA1c is not used for the diagnosis of GDM; glucose-based tests are mandatory in pregnancy due to physiological changes in RBC lifespan.

Q: A patient presents with fever and pain in the thyroid gland. Which of the following statements is true?

ESR is elevated. The clinical presentation of **fever and a painful, tender thyroid gland** is the hallmark of **Subacute Granulomatous Thyroiditis** (also known as De Quervain’s Thyroiditis). [1] ### **Explanation of the Correct Answer** * **Option B (ESR is elevated):** This is the most characteristic laboratory finding in De Quervain’s thyroiditis. The condition is an inflammatory response (often post-viral), leading to a significantly high Erythrocyte Sedimentation Rate (ESR), often exceeding 50–100 mm/hr. [1] This "exquisite" tenderness combined with a high ESR is a classic diagnostic clue for NEET-PG. ### **Analysis of Incorrect Options** * **Options A & C (T3, T4, and TSH levels):** In the early (acute) phase of the disease, inflammation causes the destruction of thyroid follicles, leading to the leakage of preformed hormones into the blood. This results in **Hyperthyroidism** (High T3/T4 and Low TSH). [1] Therefore, levels are rarely "normal" during the painful phase. * **Option D (Tuberculosis):** While TB can affect the thyroid, it is extremely rare. De Quervain’s is typically triggered by a **viral infection** (e.g., Coxsackie, Mumps, Adenovirus), not Mycobacterium tuberculosis. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Radioiodine Uptake (RAIU):** Despite high T3/T4 levels, the RAIU is **characteristically low** (near zero) because the inflamed follicular cells cannot trap iodine. [1] 2. **Triphasic Course:** The disease typically follows a sequence: Hyperthyroid phase → Transient Hypothyroid phase → Recovery (Euthyroid). [1] 3. **Histology:** Look for **multinucleated giant cells** and granulomas. 4. **Treatment:** NSAIDs are the first line for pain; Prednisone is used if the pain is severe. [1] Antithyroid drugs (PTU/Methimazole) are **not** indicated as there is no new hormone synthesis. [1]

Q: A 23-year-old woman presents with tremor, restlessness, heat intolerance, palpitation, and unexplained weight loss. The thyroid is symmetrically enlarged, the pulse is rapid, the skin is moist and warm, and exophthalmos is apparent. What is the underlying nature of this condition?

Autoimmune. The clinical presentation of tremor, heat intolerance, weight loss, tachycardia, and a symmetrically enlarged thyroid (goiter) indicates **hyperthyroidism** [2]. The presence of **exophthalmos** (thyroid eye disease) is the pathognomonic clinical sign that specifically identifies **Graves' disease** as the underlying cause [1]. 1. **Why Autoimmune is correct:** Graves' disease is an **autoimmune disorder** caused by the production of **Thyroid Stimulating Immunoglobulins (TSI)** [2]. These are Type II hypersensitivity antibodies that bind to and activate the TSH receptors on thyroid follicular cells, leading to autonomous overproduction of thyroid hormones (T3 and T4) and glandular hyperplasia [1]. 2. **Why other options are wrong:** * **Congenital:** While neonatal thyrotoxicosis can occur due to the transplacental passage of maternal antibodies, the primary disease in a 23-year-old is acquired, not a birth defect. * **Infectious:** Subacute thyroiditis (De Quervain's) can follow a viral infection, but it typically presents with a painful, tender thyroid and lacks exophthalmos. * **Iatrogenic:** This refers to hyperthyroidism caused by excessive thyroid hormone replacement (Factitious thyrotoxicosis) [3] or medications like Amiodarone. It would not present with a diffuse goiter or exophthalmos. **NEET-PG High-Yield Pearls:** * **Triad of Graves':** Hyperthyroidism, Diffuse Goiter, and Exophthalmos (Ophthalmopathy) [1]. Dermopathy (Pretibial Myxedema) is also a specific autoimmune feature. * **Diagnosis:** Low TSH, High Free T4, and **diffuse uptake** on Radioactive Iodine Uptake (RAIU) scan. * **Antibody:** TSH-Receptor Antibody (TRAb/TSI) is the most specific marker [1]. * **Histology:** Scalloping of colloid at the margins of follicular cells.

Q: A 45-year-old female diabetic patient on insulin is brought to the hospital in an unconscious state. What is the first line of treatment?

Blood glucose test. In a diabetic patient presenting with unconsciousness (altered sensorium), the primary clinical challenge is differentiating between **Hypoglycemic Coma** and **Diabetic Ketoacidosis (DKA)/Hyperosmolar Hyperglycemic State (HHS)**. ### Why "Blood Glucose Test" is the Correct Answer: The fundamental rule in emergency medicine is: **"Never treat without a diagnosis unless the patient is crashing."** While hypoglycemia is a medical emergency requiring immediate glucose [1], administering insulin to a hypoglycemic patient or concentrated dextrose to a patient with severe DKA can be fatal. A rapid bedside **Capillary Blood Glucose (CBG)** test takes seconds and dictates the entire management algorithm [2]. It is the mandatory first step to confirm the etiology of the coma. ### Why Other Options are Incorrect: * **Intravenous Insulin:** This is the treatment for DKA. If the patient is actually hypoglycemic (a common cause of coma in insulin users), giving insulin will cause irreversible brain damage or death [1]. * **Intravenous Dextrose:** While this is the treatment for hypoglycemia, it should ideally follow a glucose check. In a hospital setting, "blind" dextrose is discouraged if a glucometer is available, as it may worsen cerebral edema in hyperosmolar states. * **Intravenous Dexamethasone:** This is used for cerebral edema or adrenal crisis but has no role in the immediate stabilization of a diabetic coma. ### NEET-PG High-Yield Pearls: 1. **Whipple’s Triad:** Symptoms of hypoglycemia, low plasma glucose, and relief of symptoms after glucose administration. 2. **Neuroglycopenic symptoms** (confusion, coma) usually occur when blood glucose falls below **40–50 mg/dL** [1]. 3. In a **pre-hospital/field setting** where a glucometer is unavailable, the rule is: **"When in doubt, give glucose,"** because hypoglycemia kills faster than hyperglycemia. However, in a **hospital setting**, the "first line" is always the diagnostic test.

Q: A patient presents with galactorrhea and visual defects. Which investigation should be performed?

MRI. **Explanation:** The clinical presentation of **galactorrhea** combined with **visual field defects** (typically bitemporal hemianopia) strongly suggests a **pituitary adenoma** (most likely a Prolactinoma) [1]. Large tumors (macroadenomas >10mm) compress the optic chiasm, leading to visual impairment [1]. 1. **Why MRI is the Correct Answer:** **MRI with gadolinium enhancement** is the gold standard and investigation of choice for visualizing the pituitary gland and the sella turcica [1]. It provides superior soft-tissue resolution compared to CT, allowing for the precise identification of microadenomas (<10mm), macroadenomas, and their relationship to surrounding structures like the optic chiasm and cavernous sinuses [1]. 2. **Why other options are incorrect:** * **Serum Prolactin:** While this is the initial *biochemical* test to confirm hyperprolactinemia, it cannot visualize the anatomical extent of the tumor or the cause of the visual defect [1]. * **CT Scan:** CT is less sensitive than MRI for pituitary lesions and provides poor visualization of the optic chiasm. * **Angiography:** This is an invasive procedure used for vascular pathologies (like aneurysms) and has no role in the routine workup of a suspected pituitary adenoma. **NEET-PG High-Yield Pearls:** * **Investigation of choice for Pituitary lesions:** MRI [1]. * **Most common secretory pituitary tumor:** Prolactinoma. * **Medical Management:** Dopamine agonists (Cabergoline is preferred over Bromocriptine due to better efficacy and fewer side effects) [1]. * **Surgical Indication:** If the patient has visual field defects or is refractory to medical therapy (Transsphenoidal surgery) [1].

Question 1

A 30-year-old woman complains of headache, visual disturbances, deepening of the voice, and generalized weakness. She has amenorrhea for the past year and states that she recently required a larger shoe size. Laboratory studies show impaired glucose tolerance. What procedure would be most useful for establishing your diagnosis?

Accepted Answer

MRI of the sella turcica

Answer

Complete blood count with differential count

Answer

CT scan of the abdomen

Answer

Test for serum 21-hydroxylase

Question 2

Alkaline phosphatase levels are decreased in which of the following conditions?

Accepted Answer

Hypophosphatasia

Answer

Primary biliary cirrhosis

Answer

Hyperphosphatemia

Answer

Hepatitis A

Question 3

Which of the following features is/are suggestive of nephrogenic diabetes insipidus in comparison to central diabetes insipidus?

Accepted Answer

Basal vasopressin level is greater than 1 pg/ml.

Answer

Desmopressin nasal spray restores urine output to a normal level.

Answer

The normal posterior pituitary bright spot is not visible on MRI scan.

Answer

Change in water loss during a fluid deprivation test.

Question 4

A 29-year-old male on oral hypoglycemic drugs has never experienced ketonuria. His BMI is 20.5. His grandfather had diabetes, but his father, who is his grandfather's only son, did not have the disease. Which type of diabetes mellitus is this person most likely to have?

Accepted Answer

Type 2 diabetes

Answer

Pancreatic diabetes

Answer

Maturity-Onset Diabetes of the Young (MODY)

Answer

Type 1 diabetes

Question 5

A 30-year-old woman presents with prominent cervical and dorsal fat pads, hirsutism, acne, purple abdominal striae, unexplained hypokalemia, and diabetes mellitus. What is the most likely disease process causing these clinical syndromes?

Accepted Answer

Cushing disease

Answer

Acromegaly

Answer

Exogenous human growth hormone (HGH) use

Answer

Empty sella syndrome

Question 6

Which screening test for diabetes has the highest sensitivity?

Accepted Answer

50gms glucose challenge test

Answer

Glycosylated Hb

Answer

Blood fructosamine

Answer

Random blood sugar (RBS)

Question 7

A patient presents with fever and pain in the thyroid gland. Which of the following statements is true?

Accepted Answer

ESR is elevated

Answer

T3 and T4 levels are normal

Answer

TSH level is normal

Answer

It is due to Tuberculosis

Question 8

A 23-year-old woman presents with tremor, restlessness, heat intolerance, palpitation, and unexplained weight loss. The thyroid is symmetrically enlarged, the pulse is rapid, the skin is moist and warm, and exophthalmos is apparent. What is the underlying nature of this condition?

Accepted Answer

Autoimmune

Answer

Congenital

Answer

Infectious

Answer

Iatrogenic

Question 9

A 45-year-old female diabetic patient on insulin is brought to the hospital in an unconscious state. What is the first line of treatment?

Accepted Answer

Blood glucose test

Answer

Intravenous insulin

Answer

Intravenous infusion of dextrose

Answer

Intravenous dexamethasone injection

Question 10

A patient presents with galactorrhea and visual defects. Which investigation should be performed?

Accepted Answer

MRI

Answer

Serum prolactin

Answer

CT scan of the brain

Answer

Angiography

Endocrinology — MCQs

Endocrinology — MCQs

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