UPSC-CMS 2024 — General Medicine

Q: Which of the following are approximate daily requirements of the common electrolytes in an adult? 1. Sodium 50-90 mM/day 2. Calcium 25-30 mM/day 3. Potassium 90 mM/day 4. Magnesium 15-17 mM/day Select the correct answer using the code given below.

1, 3 and 4. ***1, 3 and 4*** - The approximate daily requirements for **sodium** are indeed within the range of **50-90 mM/day** (typical maintenance: 1-2 mEq/kg/day) - **Potassium** is around **90 mM/day** (typical maintenance: 1 mEq/kg/day or ~70 mEq/day) - **Magnesium** is typically **15-17 mM/day** (typical maintenance: 0.2-0.3 mEq/kg/day or ~7-10 mM/day) - These values are essential for maintaining proper physiological functions, including fluid balance, nerve impulse transmission, and muscle contraction *2, 3 and 4* - This option incorrectly includes the daily requirement for **calcium** as **25-30 mM/day**, which is approximately **3-4 times higher** than the typical maintenance requirement - Actual adult calcium requirement is approximately **0.1-0.2 mEq/kg/day** or **3.5-7 mM/day** - While potassium and magnesium values are close to accurate, the calcium value makes this option incorrect *1, 2 and 3* - This option incorrectly states the daily requirement for **calcium** as **25-30 mM/day** - The value of **25-30 mM/day** appears to confuse dietary calcium intake (1000-1200 mg/day ≈ 25-30 mmol) with maintenance electrolyte requirements - Although sodium and potassium requirements are correctly stated, the error in calcium makes this choice incorrect *1, 2 and 4* - This combination is incorrect because it includes the inaccurate daily requirement for **calcium** as **25-30 mM/day** - While sodium and magnesium requirements are generally accurate, the inclusion of the incorrect calcium value (should be ~3.5-7 mM/day) invalidates this option [Practice more General Medicine PYQs on OnCourse]

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Which of the following are approximate daily requirements of the common electrolytes in an adult? 1. Sodium 50-90 mM/day 2. Calcium 25-30 mM/day 3. Potassium 90 mM/day 4. Magnesium 15-17 mM/day Select the correct answer using the code given below.