Test Overview
Clinical Utility
Testing for protein S deficiency during an acute illness or anticoagulant therapy is not recommended.
Method
Latex Immunoturbidimetry
Result Included
Protein S - Free; Protein S - Total
Specimen
Specimen Type
Plasma (Citrate)Containers
Collection Containers
Blue top (3.2% buffered citrate)
Volume
Sample Volume
3 mL
Patient Preparation
Patient should not be on anticoagulant therapy.
Collection & Handling
Handling Information
Prepare platelet-poor plasma and freeze immediately. Store and send frozen.
Stability
| Frozen |
|---|
| 2 weeks at ≤-20°C |
If the specimen thaws, it is unsuitable for analysis.
Rejection Criteria
| Criteria | Specification |
|---|---|
| Specimen | Not frozen |
Performance & Interpretation
Turnaround Time
10 days
Results
Name
Units
Reference Range
Conversion
-
Protein S - TotalU/mLFemale: 0.65 - 1.35
Male: 0.86 - 1.40 -
Protein S - FreeU/mL0 - 30 days: 0.61 - 1.08
1 - 5 months: 0.48 - 1.27
6 - 11 months: 0.63 - 1.39
1 y -5 y:0.53 - 1.35
6 y - 10 y: 0.62 - 1.42
11 y - 17 y: 0.61 - 1.31
Adult, female: 0.55 - 1.24
Adult, male: 0.74 - 1.46
Referral Location
Canada
Interface & Setup
HL7 Interface Codes
| Order Code | Result Name | Result Codes | Units |
|---|---|---|---|
| PROSFRT | PROTEIN S FREE | 7303 | U/mL |
| PROTEIN S TOTAL | 7302 | U/mL |
Test Version
Last Updated
2022-12-15