2 - 5 days
Protein S Antigen, Free and Total
PROTEIN S ANTIGEN, PLASMA
PROTEIN S ANTIGEN, FREE
PROTEIN S ANTIGEN, TOTAL
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Diagnosis of congenital or acquired protein S deficiency states.
Males: Free 65 - 160%, Total 80 - 160%; Females, age <50 yrs: Free 50 - 160%, Total 70 - 160%; Females, age >=50 yrs: Free 65 - 160%, Total 80 - 160%.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Collect specimen in a blue top (citrate 3.2%) tube. Mix by inversion. Specimen should arrive at lab within 3 hours of collection; transport at room temperature. Alternatively, centrifuge, aliquot plasma into a polypropylene plastic vial, and freeze the specimen within 4 hours of collection. Transport frozen specimen on dry ice. Collection of the blood through lines that have been previously flushed with heparin should be avoided. If the blood must be drawn through a VAD (vascular access device), the line should be flushed with 5 mL of saline and the first 5 mL of blood or six dead space volumes of the VAD discarded.