87560:PROTEIN S ANTIGEN, TOTAL AND FREE, PLASMA
Author PeaceHealth Laboratories
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| Alias Names: |
Soft-PSTF |
| Methodology: |
Automated Latex Immunoassay (LIA) |
| Edit Date: |
4/8/2010 |
| Performed: |
Monday-Friday |
| Released: |
24-72 hours after setup at PeaceHealth Laboratories’ reference lab |
| CPT Code: |
85306 Free / 85305 Total if appropriate |
| Specimen Collection Details |
| Collection: |
One 4.5 light blue top tube (sodium citrate). |
| Handling: |
Immediately centrifuge and plasma. Centrifuge again and separate into TWO plastic vials, each containing 0.5 mL plasma. Do not use glass vials. NOTE: A double-centrifuged specimen is critical for accurate results as platelet contamination may cause spurious results. Label each tube as ‘double-spun plasma.’ Freeze immediately ≤ -40° C. Indicate if patient is on Coumadin, which will lower Protein S. Each coagulation assay requested should have its own vial. |
| Standard Volume: |
1 mL plasma divided into two tubes containing 0.5 mL each. |
| Minimum Volume: |
0.5 mL plasma divided into two tubes (may result in QNS for reflex testing) |
| Transport: |
Frozen on dry ice. |
| Comments: |
Useful for investigation of patients with a history of thrombosis. |
| Rejection Criteria: |
Thawing or thawed specimen; hemolysis or lipemia. |
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TOTAL |
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|
|
Male |
80-160% |
|
|
Female <50 years |
70-160% |
|
|
Female ≥50 years |
80-160% |
|
|
FREE |
|
|
|
Male |
65-160% |
|
|
Female <50 years |
50-160% |
|
|
Female ≥50 years |
65-160% |
|
| Protein S values vary widely in the normal population and are age- and sex-dependent.
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