Design an alternate assessment and judge a corrective action

The chemistry bench also runs a calculated result, an anion gap-style index, that has no CLIA-listed PT program. For this analyte the laboratory owes documented accuracy verification at least twice a year rather than PT enrollment. Your task is to choose a workable design from the recognized options: a split patient specimen tested by a second qualified method or laboratory, a blinded recheck of previously tested material, a reference or comparison material with predefined criteria, or a case or image re-evaluation where that fits the discipline. A calibrator or control is not an acceptable substitute on its own; it can assess part of analytical performance but it does not behave like a patient specimen and cannot stand in for the full patient-testing pathway.

A split-specimen design is only sound if the laboratory defines, before running it, which ordinary patient specimen qualifies, how long it remains stable for the split test, the timing between the two results, which comparison method or laboratory receives the second aliquot, the acceptance criterion for agreement, and exactly what happens when the two results disagree. Skipping any one of those elements turns an alternate assessment into an ungraded exercise with no defensible interpretation.

The learner decision has two parts. First, identify which of the four required-content scenarios below describes a prohibited practice, and which describes a permitted response. Second, given a proposed corrective action for the PT-3 sodium event, decide whether it is preferred, acceptable but incomplete, or unsupported, and say what evidence is missing.

Alternative performance assessment is not limited to a single approach. CAP lists participation in an external PT program not required by CAP, an ungraded or educational PT program, split-sample analysis with another laboratory or with an established in-house method, and use of assayed materials as appropriate options, each integrated into the routine workload where applicable. This is a menu for finding comparison data, not a replacement for defining your own acceptance criteria beforehand.

An alternate assessment is only as strong as the acceptance criteria and discrepancy plan written down before the first sample runs.