|Test Name||Protein S Activity|
|Alias||Functional Protein S|
|Preferred Container||Citrate, 3.2% (Lt Blue)|
|Other Specimen/Container||Whole Blood in Citrate, 3.2% (Lt Blue) if testing is done within 4 hours.|
|Optimum Volume||Plasma = 1 mL|
Whole Blood = Entire tube
|Collection Instructions||Draw full tube. Mix tube well|
Patient should be off of coumadin for 2 weeks and off high levels of heparin for 48 hours before sample collection
Consult pathology for further information.
|Handling Instructions||Double centrifuge plasma, separate, and freeze at -20 deg. C immediately. Do NOT thaw once specimen is frozen.|
|Transport Requirements||Preferred method of transport is frozen plasma.|
|Specimen Stability||Ambient: 4 hours Whole Blood (unopened tube)|
Ambient: 4 hours Plasma
Frozen: 1 month Plasma
|Rejection Criteria||Clotted, Contaminated, Hemolyzed,|
Improperly filled or underfilled tube,
Specimen older than stability limits.
|Analytic Time||Up to 1 Week|
The reference ranges listed below are valid on this date of January 26, 2022.
|Component||Age||Male Norm||Male Critical Low||Male Critical High||Female Norm||Female Critical High||Female Critical Low||Units||Add'l info|
|Protein S Activity||ALL||65-140||65-140||%|