Part 4 · Making Sense of Numbers
Same concept, other depth: Clinical Reasoning →
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Why does a lab report say "normal Hb: 12–15.5 g/dL" for women? Labs often define the "normal range" as the middle 95% of healthy people: the mean ± about 2 SD. That means 5% of perfectly healthy people fall outside the "normal" range just by chance. "Abnormal" isn't always "diseased".
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