Protein S, Activity

Last Modified: 8/31/2023 3:23:19 PM


Medical Necessity Documentation: Recommended as outpatient testing only
Client Notes:  
Patient Preparation:  
Specimen Requirements: 1.0 mL Plasma from a Blue Top Tube - 3.2% Na Citrate in a Plastic Vial
Collection Instructions:

1. Mix gently by inverting tube 3-4 times immediately after collection. 
2. Centrifuge 15 minutes at 1500g within 1 hour of collection. 
3. Using a plastic plastic pipette, remove plasma, taking care to avoid the WBC/platelet buffy layer and place into plastic vial.
4. Centrifuge a second time and transer platelet poor plasma into a new plastic vial. 
5. Freeze Immediatately and transport on dry ice.

Avoid Hemolysis 
Minimum Volume: 0.5 mL
Transport & Storage: Temperature/Stability: Unacceptable Ambient
Unacceptable Refrigerated
30 days Frozen
Rejection Criteria: Hemolysis
Reference Range: Male: 70% - 150% of normal
Female: 60% - 140% of normal
Critical Ranges:  
Test Comments:  
Methodology: Clotting Assay
Clinical Significance:  
Documentation:  
Custom Panel: No

PRODUCTION SCHEDULE

Turn Around Time: 3 to 5 days
Days Performed: Monday, Tuesday, Wednesday, Thursday, Friday
Sites Performed: Quest - Chantilly
PHL Test Code: PROTS
EPIC Test Code: LAB491
Send Out Test Code: 48523 / 1779X
Included Tests:  
CPT Coding: 85306

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