Carolinas HealthCare System

FAQs for Hematology and Coagulation
Question
Can you run a complete blood count (CBC) on a clotted specimen?
Question
If a sample has been properly collected and mixed with anticoagulant (lavender or blue top sample collection tube), can a delay in processing cause the whole blood sample to clot?
Question
What are the time limits for coagulation test add-ons (PT, APTT)?
Question
What causes damage to a red blood cell sample?
Question
Why does blood clot in tubes collected for a CBC, PT, and APTT?
Question
Why is it so important to properly fill the blue top collection tubes used for coagulation testing?
Question
Why must blood thinner medication (Coumadin, Heparin) levels be checked?


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