Test Code LAB492 Protein S Antigen, Plasma
Additional Codes
46381
Reporting Title
Protein S Ag
Methodology
Profile Information: | ||
Unit Codes | Published Name | Available Separately |
251 | Protein S Antigen, Free | Yes |
252 | Protein S Antigen, Total | No |
Please see the Coagulation Limitations under resources for effect of Anticoagulant drugs in this test.
Testing Algorithm:
If free protein S is below normal range (<50%), total protein S will be performed.
Method Name:
Enzyme-Linked Immunosorbent Assay (ELISA)
Performing Laboratory
OhioHealth Laboratory Services-RMH Core Coagulation
Specimen Requirements
Draw a full, light blue-top (citrate) tube. Spin down, remove plasma, spin plasma again, and place 2 aliquots of 1 mL of citrated platelet-poor plasma in plastic vials. (Glass vial is not acceptable.) Pour-off vial should be no more than 1/3 full. Freeze immediately at ≤40° and send specimen frozen.
Note: 1. This assay requires its own specimen.
2. Double-centrifuged specimen is critical for accurate results as platelet contamination may cause spurious results.
3. If patient is being treated with Coumadin®, this should be noted. Coumadin® will lower protein S.
Specimen Transport Temperature
Frozen/Refrigerate NO/Ambient NO
Reference Values
Protein S Antigen, Free
50-130%
Protein S Antigen, Total
50-130%
Day(s) Test Set Up
Thursday
Test Classification and CPT Coding
85306 - Protein S Antigen, Free
85305 - Protein S Antigen, Total (if appropriate)