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If the tube used for a prothrombin time (PT) test is only half full, it may lead to an inaccurate blood-to-additive ratio, which can compromise the anticoagulant properties of the sample. This dilution can alter the concentration of the anticoagulant, potentially resulting in prolonged or shortened PT results. Thus, a half-full tube may not provide reliable information about the patient's coagulation status. It's essential to ensure proper sample volume for accurate testing.

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1w ago

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