Protein S Free, Antigen
Recommended test to detect protein S deficiency. Do not order if individual has been on warfarin therapy in the previous 2-4 weeks.
Microlatex Particle-Mediated Immunoassay
New York DOH Approval Status
Light Blue (Sodium Citrate). Refer to Specimen Handling at aruplab.com for hemostasis/thrombosis specimen handling guidelines.
Transfer 1.5 mL platelet-poor plasma to an ARUP Standard Transport Tube. (Min: 1 mL)
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.
Serum. EDTA plasma, clotted or hemolyzed specimens.
Ambient: 4 hours; Refrigerated: Unacceptable; Frozen at -20°C: 3 months, at -70°C: 6 months
|18 years and older||74-147%||55-123%|
Patients on warfarin may have decreased free protein S values. Patients should be off warfarin therapy for two weeks for accurate measurement of free protein S levels. Decreased levels of free protein S are also associated with DIC, liver disease, pregnancy, and inflammatory syndromes.
|Component Test Code*||Component Chart Name||LOINC|
|0098894||Protein S Ag Free||27821-8|