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Protein C antigen, protein C functional.
To assess coagulation function and assist in diagnosis of disorders such as thrombosis and protein C deficiency.
Plasma collected in a completely filled blue-top (3.2% sodium citrate) tube. If the patient’s hematocrit exceeds 55%, the volume of citrate in the collection tube must be adjusted.
(Method: Clot detection) 70% to 140% activity. Values are significantly reduced in children because of liver immaturity. Levels rise to approximately 50% of adult levels by age 5 yr and reach adult levels by age 16 yr.