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Protein S Activity

Order Code: 1041 Get Requisition Form
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Test Information
This test provides the activity level of the blood coagulation factor, Protein S. This protein is one of the regulatory proteins in the blood clotting cascade.
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Also Known As
  • PS
  • PS Activity
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Test Type
Functional/Serologic Test
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Sample Notes
Citrated Plasma (light blue top)
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Requested Volume
0.5 ml
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Minimum / Pediatric Volume
0.3 ml
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Additional Sample Information
Protein S activity is measured by a prothrombin-time-based clotting method. Patients should be off warfarin for at least 4 weeks before drawing a sample. The assay kit manufacturer has demonstrated the assay to be unaffected by levels of unfractionated heparin or low molecular weight heparin up to 2 IU/mL, but the results may be artifactually elevated in samples containing dabigatran or rivaroxaban. Platelet contamination of plasma samples causes an under-recovery of Protein S level, and proper sample preparation is required. Age and gender specific reference intervals are used.
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Shipping Information
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CPT Codes
  • 85306
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Turnaround Time
7 days
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New York State Approval
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DEX Z-Code™
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