Q: What laboratory tests should be ordered if a bleeding problem is suspected?
• Platelet count: normal values = 150,000-400,000/μL
• Prothrombin time (PT): normal value = 10-13.5 seconds
• International normalized ratio (INR): normal value = 1-2 (only useful for those patients on known anticoagulant medications)
• Partial thromboplastin time (PTT): normal value = 25-36 seconds
• Thrombin time (TT): normal value = 9-13 seconds
• Bleeding time: normal value ≤ 9 minutes (bleeding time is a nonspecific predictor of platelet function)Normal values may vary from one laboratory to another. It is important to check the normalvalues for the laboratory that you use. If any of the tests are abnormal, the patient should be referred to a hematologist for evaluation before treatment is performed.
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• Platelet count: normal values = 150,000-400,000/μL
• Prothrombin time (PT): normal value = 10-13.5 seconds
• International normalized ratio (INR): normal value = 1-2 (only useful for those patients on known anticoagulant medications)
• Partial thromboplastin time (PTT): normal value = 25-36 seconds
• Thrombin time (TT): normal value = 9-13 seconds
• Bleeding time: normal value ≤ 9 minutes (bleeding time is a nonspecific predictor of platelet function)Normal values may vary from one laboratory to another. It is important to check the normalvalues for the laboratory that you use. If any of the tests are abnormal, the patient should be referred to a hematologist for evaluation before treatment is performed.
T.me/DrBBB