Threshold Value Limit

The thresholdValue is the core number in a ThresholdValue record — it is the regulatory standard that an AnalyticalResult must not breach. Piper compares each result's normalizedValue to the thresholdValue using the direction specified on the record, and computes the exceedanceRatio (result divided by threshold) when an exceedance occurs. Accuracy of the thresholdValue is paramount: a transposition error such as entering 5.0 instead of 0.5 ug/L would cause false negatives for real exceedances. Always cross-check thresholdValue entries against the published regulatory table and the accompanying citation before activating the ThresholdSet.