The problem with laboratory reference ranges
Tonight, my lab quietly changed what it considers a “normal” ApoB. On Monday, my patient’s ApoB of 98 mg/dL was comfortably green. On Tuesday, that same number was flagged high, a 30-point swing in the normal range overnight. No new evidence. No new trial. No public health crisis. Just a reference-range recalibration. And with that one quiet adjustment, millions of people who went to bed “normal” may wake up “abnormal.”
Reference …








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