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Introduction
Very Sociable
Guy
Chest Pain
Girl with a Rash
England 1944
Trouble Healing
Morning Stiffness
Bruises Easily
Shortness of
Breath
Drug Interactions
Review
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Quiz
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Laboratory
Evaluation of Hemostasis
- Quality of the blood specimen is critical
for
reliable results.
- Tests are done on citrated plasma (citrate
chelates the calcium to prevent clotting.)
- Hemolyzed or partially clotted specimens will
give unreliable results.
Screening
tests
- CBC; anemia, RBC morphology, platelet
numbers.
- Prothrombin time (PT):
measures extrinsic path.
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- Activated partial thromboplastin
time (aPTT):
- Thrombin Time (TT): measures
conversion of fibrinogen to fibrin. Click here.
- Platelet count: The number
is helpful, but it says nothing about platelet function.
Confirmatory tests
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