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| Title | PROTEIN S ACTIVITY |
| Specimen Requirement | <p>1-Blue top tube (sodium citrate 3.2%). Tube must be full when collected. Centrifuge specimen and remove plasma to a transport tube and freeze. Indicate on tube "plasma/blue top". Contact lab for dry ice for shipment.</p> |
| Methodology | |
| Stability | Frozen 3 weeks |
| Reference Range | By Report* |
| Turnaround | Performed Friday |
| Clinical Use | <p>Diagnosis of congenital protein S deficiency which may increase the risk of thrombosis. An abnormal result should be followed up with protein S antigen, total and free.</p> |
| Test Code | PTSAS |
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