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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