Which lab value falls within the normal range?
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Correct answer: Calcium 9.2 mg/dL
Normal sodium ~135–145 mEq/L, potassium ~3.5–5.1 mEq/L, calcium ~8.4–10.6 mg/dL, magnesium ~1.3–2.1 mg/dL. Thus only calcium 9.2 mg/dL is within normal.
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