Required section · Section 5 of 6

Choose the method, validate the specimen, read the panel

Select the method that answers the stated clinical question, verify specimen acceptance before trusting a result, and interpret the resulting agonist or cartridge panel within its method-specific limits.

Order matters here. Specimen acceptance is checked before a result is trusted, the method is matched to the question before a number is read, and pattern recognition happens only after both of those are settled. Skipping ahead to interpret a number before confirming the specimen and the method is exactly the failure mode these three decisions are built to catch.

A defensible platelet-function comment names the method, states what was observed, and states plainly what still requires local policy, additional testing, or qualified review.

Ordering exercise

Place these four steps of a platelet-function workup in the order a bench scientist should actually perform them.

1. Match the method to the question

Confirm the ordered method and agonist or cartridge panel actually addresses the clinical question being asked.
2. Run the test and read the pattern

Compare the result across agonists or cartridges and against count, hematocrit, and medication history.
3. Confirm specimen acceptance

Check anticoagulant, fill, mixing, hemolysis, and timing against the method's declared requirements.
4. Release with comment or escalate

Release a method-specific result and comment, or route a nonspecific or complex pattern to confirmatory testing and qualified review.

Knowledge checks

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Knowledge check 1

Which of these specimen conditions can invalidate or interfere with platelet-function testing? Select every condition that applies.

Choose at least 2 options.

Hemolysis in the collected specimen

Interrupted flow or venous collapse during the draw

Visible microthrombi in the tube

A tube filled to the correct 9:1 blood-to-anticoagulant ratio

Knowledge check 2

A clinician wants to know whether a patient's platelets are releasing dense-granule contents normally, beyond just whether they aggregate. Which method is designed to answer that specific question?

Choose one option.

Lumiaggregometry, which pairs aggregation with a luciferin-luciferase measurement of ATP release

PFA high-shear closure time

Whole-blood impedance aggregometry

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