When must testing occur for coagulation-based specimens?

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Multiple Choice

When must testing occur for coagulation-based specimens?

Coagulation tests are very sensitive to preanalytic handling, so timing matters to ensure accurate results. Prothrombin time (PT) is relatively stable and can be reliably tested within 24 hours after collection if the specimen is stored properly. Activated partial thromboplastin time (APTT) is more time‑sensitive and should be completed within about 4 hours to avoid drift from factor degradation or artefacts. When a patient is on heparin, the sample’s accuracy is more easily affected, so processing should be rapid by separating plasma within 1 hour to minimize the anticoagulant’s impact and obtain a valid result. This combination—PT within 24 hours, APTT within 4 hours, and rapid spin within 1 hour if on heparin—best reflects standard preanalytical guidelines.

Coagulation tests are very sensitive to preanalytic handling, so timing matters to ensure accurate results. Prothrombin time (PT) is relatively stable and can be reliably tested within 24 hours after collection if the specimen is stored properly. Activated partial thromboplastin time (APTT) is more time‑sensitive and should be completed within about 4 hours to avoid drift from factor degradation or artefacts. When a patient is on heparin, the sample’s accuracy is more easily affected, so processing should be rapid by separating plasma within 1 hour to minimize the anticoagulant’s impact and obtain a valid result. This combination—PT within 24 hours, APTT within 4 hours, and rapid spin within 1 hour if on heparin—best reflects standard preanalytical guidelines.

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