prothrombin time
[proh-THROM-bin tīm]
nounpl: prothrombin times
tempo de protrombina
1. A blood test that measures how long it takes for blood plasma to clot after adding tissue factor and calcium; used to assess the extrinsic pathway of coagulation and monitor anticoagulant therapy
The patient's prothrombin time was elevated, indicating delayed blood clotting.
O tempo de protrombina do paciente estava elevado, indicando coagulação sanguínea atrasada.
2. A laboratory test commonly abbreviated as PT, often expressed as an International Normalized Ratio (INR) for standardization
Her INR, derived from the prothrombin time test, was within therapeutic range for warfarin therapy.
Seu INR, derivado do teste de tempo de protrombina, estava dentro da faixa terapêutica para terapia com varfarina.
Prothrombin time is a critical diagnostic tool in both American and Brazilian medical practice. In the USA, it is routinely ordered for patients on warfarin therapy and before surgical procedures. In Brazil, it is similarly essential in clinical laboratories and is often part of coagulation profiles requested by physicians. The test is universally understood in medical contexts across English and Portuguese-speaking countries as a standard indicator of blood clotting ability.
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