At what point is an ANA test considered positive

At what point is an ANA test considered positive?

A positive ANA is arbitrarily defined as that level of ANAs that exceeds the level seen in 95% of the normal population. Each laboratory must determine the level that it considers positive, and this level may vary significantly among laboratories. In most laboratories where HEp-2 cells are used as substrate to detect an ANA, clinically significant titers are usually ≥1:160.

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