Protein S Antigen, Free

Last Modified: 10/5/2022 11:01:49 AM


Medical Necessity Documentation: Recommended as outpatient testing only
Client Notes:  
Patient Preparation:  Patient should discontinue taking Biotin, Vitamin B7, or Vitamin H 48 hours before getting blood drawn
Specimen Requirements:

3.0 mL Platelet Poor Plasma from a Blue Top Tube - 3.2% Na Citrate in a Plastic Vial
Collection Instructions:
Draw blood in light blue-top tube containing 3.2% sodium citrate, and mix gently by inverting 3-4 times. 
Centrifuge 15 minutes at 1500 x g within 1 hour of collection. Using a plastic pipette, remove plasma, taking care to avoid the WBC/platelet
buffy layer and place into a plastic vial. 
Centrifuge a second time and transfer platelet-poor plasma into a new plastic vial(s). 
Freeze immediately and transport on dry ice
Minimum Volume: 1.0 mL Platelet Poor Plasma
Transport & Storage: Temperature/Stability: Unacceptable Ambient
Unacceptable Refrigerated
30 days Frozen
Reference Range: Males: 57-171% of normal
Females: 50-147% of normal
Critical Ranges:  
Test Comments:  
Methodology: Immunoturbidimetric
Clinical Significance:  
Documentation:  
Custom Panel: No

PRODUCTION SCHEDULE

Days Performed: Monday, Tuesday, Wednesday, Thursday, Friday
Departments:
Sites Performed: Quest - Chantilly
PHL Test Code: PSFR
EPIC Test Code: IMO204
Send Out Test Code: 10170
Alternate Test Names: Protein S Ag, Free
Included Tests:  
CPT Coding: 85306

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