Advantages of the APTT Over the Anti-Factor Xa Chromogenic Assay

question 47

Multiple Choice

Advantages of the APTT over the anti-factor Xa chromogenic assay for monitoring intravenous heparin therapy include all of the following except:

• A) The technique is quick, familiar, and easy for laboratorians.
• B) It is inexpensive.
• C) It correlates in a linear fashion, across many patient samples, with the actual concentration (U/mL) of heparin in the patient's plasma.
• D) It reflects the anticoagulant activity of the heparin in the patient's plasma.

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