Test Code PRS Protein S Assay
Laboratory Code
LAB491
Specimen Requirements
Submit only one of the following specimens
Specimen Type: Whole Blood
Container/Tube: 2 Light Blue Top (3.2% Sodium Citrate)
Volume: 2 × 2.7 mL Whole Blood (Tubes must be full)
Collection Instructions: Send whole blood specimens to laboratory immediately.
Specimen Type: Platelet Poor Plasma
Container/Tube: 2 Light Blue Top (3.2% Sodium Citrate)
Submission Container/Tube: Plastic Vial
Minimum Volume: 1.0 mL plasma
Collection Instructions:
1. Light blue top tube must be properly filled with whole blood.
2. Whole blood specimen should be double centrifuged and plasma separated from cells within 1 hr of collection.
3. Plasma should be separated into 2 aliquots with minimum volume of 1.0 mL each.
4. Freeze the aliquots in well-closed plastic tubes immediately.
Specimen Stability
Specimen Type | Plasma |
---|---|
Ambient | 4 hours |
Refrigerate | 4 hours |
Frozen | 14 days (preferred) |
Methodology
Turbidimetric immunoassay
Days and Times Performed
Wednesday, TAT 28 days
Specimen Condition
Gross Haemolysis | Reject |
---|---|
Icterus | OK |
Gross Lipaemia | Reject |
Others: Clotted or insufficient specimen | Reject |
Reference Interval
Male | 73 – 131 % |
---|---|
Female | 65 – 115 % |
Testing Laboratory
National University Hospital
Haematology, 67725320
Useful For
Investigation of inherited and acquired thrombotic.
Service Code
12428
LOINC Code Information
4677-1
Alias
PRS
Functional Protein S
Update
Last updated 21/03/2025