Covid Test Detected Abnormal Reference Range Not Detected. Brand and generic products for sale. But that’s not all that unusual.

It is just a question of semantics, but it means the same as negative, and is a more precise way of giving the result, in medical parlance. Since many reference values are based on statistical ranges in healthy people, you may be one of the healthy people outside the statistical range, especially if your value is close to the expected reference range. The range helps show what a typical normal result looks like.
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