July 2024 QQ: Specimen Storage

Coag specimen mismanagement is the source of most errors in hemostasis testing. As mentioned in our June 28, 2024 entry, Adjusting AC Volume in Polycythemia, CLSI released its latest edition of H21: Collection, Transport, and Processing of Blood Specimens for Testing Plasma-Based Coagulation Assays, 6th ed. Guideline H21, Clinical Laboratory and Standards Institute, 2024. The guideline offers specific storage period limits for routine and special coagulation testing. Our July 2024 question, concerning H21, asks “How long may you store a specimen after collection for a PT test?” Your answer will help us discuss proper specimen management. As always, add your comment below.