Laboratories use qualifier codes to signal that a result has some caveat — common codes include "J" for estimated result below reporting limit, "B" for analyte detected in the method blank, or "U" for undetected. The qualifier stored on an AnalyticalResult preserves this information directly from the lab report. Compliance staff reviewing results should pay attention to qualifier values alongside resultValue, because a "J"-qualified result is an estimate and may carry more uncertainty than an unqualified detection when assessing whether an exceedance threshold has truly been exceeded.
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Analytical Result Qualifier
The `qualifier` on an AnalyticalResult stores the lab data qualifier code that the laboratory assigned to indicate special handling or uncertainty.