ARUP's Laboratory Test Directory
| 0098894: Protein S Free, Antigen |
| Test Mnemonic: PRO S FREE | |
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Methodology: Microlatex Particle-Mediated Immunoassay (LIA)
Performed: Mon-Fri Reported: 1-4 days |
| Specimen Required: | |
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Collect: One 5 mL lt. blue (sodium citrate). Refer to the Hemostasis/Thrombosis Specimens section in the front of this User's Guide for specimen collection instructions.
Transport: 2 mL platelet-poor plasma, frozen. (Min: 1.5 mL) Submit specimen in an ARUP Standard Transport Tube. Pediatric Collection/Transport: 1 mL platelet-poor plasma, frozen. Remarks: CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered. Unacceptable Conditions: Serum. Nonfrozen or hemolyzed specimens. Stability: Ambient: 2 hours; Refrigerated: 4 hours; Frozen: 2 weeks |
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| Reference Interval: |
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1-89 days: 15-55% 90-179 days: 35-92% 180-364 days: 45-115% 1-5 years: 62-120% 6-9 years: 62-130% 10-17 years: 60-140% 18 years and older Male: 74-147% 18 years and older Female: 55-123% |
| Interpretive Data: | |
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Patients on oral anticoagulants will have decreased protein free S values. Patients should be off oral anticoagulant therapy for two weeks for accurate measurement of free protein S levels. Decreased levels of protein S free are also associated with DIC, liver disease, pregnancy, and inflammatory syndromes.
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| CPT Code(s): | |
| 85306 |