Casandra
Casandra Test Code QD00487Version 1 (DRAFT)
Performing Lab
Protein S Activity with Reflex to Protein S Antigen, Total and Free
Clinical Use
Order TestUse
Measurement of plasma free Protein S antigen is the initial screen for Protein S deficiency. A decreased free Protein S antigen prompts reflex testing for total Protein S antigen to help distinguish hereditary versus acquired deficiency states as part of a thrombophilia evaluation.
Special Instructions
Not provided.
Limitations
Not provided.
Test Details
Methodology
Immunoassay (Latex Immunoassay)
Biomarkers
2 components
Free Protein S Antigen • Latex ImmunoassayTotal Protein S Antigen (reflex) • Latex Immunoassay
LOINC Codes
Order Codes
- Z238-6
Result Turnaround Time
2-5 days
Related Documents
For more information, please review the documents below
Specimen Requirements
Specimen
Plasma
Volume
1 mL plasma (0.5 mL per tube × 2)
Minimum Volume
0.5 mL plasma (0.25 mL per tube × 2)
Container
blue top (citrate 3.2%) tube; polypropylene plastic vial if frozen
Collection Instructions
Mix by inversion. Specimen arrive within 3 hours at room temp; or centrifuge, aliquot plasma and freeze within 4 hours; transport frozen on dry ice. Avoid heparin line draws.