Q: What does the prothrombin time (PT) test measure?
A: The prothrombin test measures the clotting ability of blood protein factors I, II (prothrombin), V, VII, and X. If any of these factors are too low, it takes longer than normal for the blood to clot. Prothrombin is a vitamin K dependent factor meaning a deficiency of vitamin K will cause low prothrombin.
Blood is drawn into a blood collection tube with a light blue stopper which has a buffering additive. Tubes must be completely filled.
What Is Prolonged Prothrombin Time In Celiac Disease and/or Gluten Sensitivity?
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