FREE S
Protein S Antigen, Free
EPIC Test Procedure Code: LAB2360
Performing Lab:
Saint Luke's Regional Laboratories
Container Type:
Light blue top (sodium citrate) tube
Specimen Type:
Platelet Poor Plasma
Preferred Volume:
2 mL
Minimum Volume:
1 mL
Collection Procedure:
Specimen Processing:
1. Centrifuge specimen in a centrifuge that has been validated to ensure platelet poor plasma.
2. Immediately transfer the plasma to a stoppered, plastic tube and centrifuge again for 10 minutes.
3. Transfer the supernatant plasma into a screw-capped, plastic vial and send at ≤ -20 ºC, if possible.
4. If unable to centrifuge, forward unprocessed sodium citrate whole blood (minimum volume: 2 mL) to the laboratory promptly at room temperature only.
Store and Transport:
Frozen (plasma)
Stability:
Unspun specimens must arrive within 2 hours of collection.
CPT Codes:
85306 - Protein S Free (EAP 30022440)
85305 - total (if applicable)
Test Schedule:
Monday - Friday
Method:
Latex Immunoassay (LIA)
Test Includes:
If FREE S "Protein S Antigen, Free" is low, then TOTAL S "Protein S Antigen, Total" will be performed and charged.
Reference Ranges:
57 - 120
%