7 days
Total and Free PS antigens are measured by latex immunoassayFree PS is measured by EIA after C4b-BP complexed PS is prepcipitated out with polyethylene glycol.
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Measures free or total protein S. Used in evaluating protein S deficiency and clotting disorders.
Plasma
3 mL
Blue top (sodium citrate) tube
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
This test does not require any special collection or pre-analytical handling. Follow routine specimen collection protocols.
| Temperature | Period |
|---|---|
| Frozen | 28 days |
| Freeze/thaw cycles | Stable x3 |