Davis’s Laboratory and Diagnostic Tests Online, powered by Unbound Medicine, provides nurses and students access to 400+ test monographs containing reference ranges, indications, patient preparation and result interpretation. Explore these free sample topics:
-- The first section of this topic is shown below --
Protein S antigen, protein S functional.
To assess coagulation function, assist in the diagnosis of disorders such as disseminated intravascular coagulation (DIC), and evaluate oral anticoagulation therapy.
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)
|Note: The low end of “normal” is lower in patients younger than age 16 because of the immaturity of the liver.|