By how much does creatinine clearance typically decline with every decade after age 20?

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Multiple Choice

By how much does creatinine clearance typically decline with every decade after age 20?

Explanation:
Creatinine clearance, a practical stand‑in for GFR, declines with age as nephron number and renal perfusion decrease. After age 20, the typical drop is about 6.5 mL/min per decade. This means a healthy young adult with roughly 120 mL/min would decrease to about 94 mL/min by age 60 (roughly four decades × 6.5). The other options reflect rates that are too small or too large for the commonly cited aging pattern. This gradual decline is important for understanding why drug clearance changes with age and why dosing often needs adjustment in older adults.

Creatinine clearance, a practical stand‑in for GFR, declines with age as nephron number and renal perfusion decrease. After age 20, the typical drop is about 6.5 mL/min per decade. This means a healthy young adult with roughly 120 mL/min would decrease to about 94 mL/min by age 60 (roughly four decades × 6.5). The other options reflect rates that are too small or too large for the commonly cited aging pattern. This gradual decline is important for understanding why drug clearance changes with age and why dosing often needs adjustment in older adults.

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