Thrombophilia Screen (Antithrombin 3, Free Protein S, Protein C)


Thrombophilia Screen:

Antithrombin 3
Free Protein S
Protein C

Can also include Factor V Leiden and Prothrombin mutation.

Tube TypePurple (EDTA)Blue x 3 (Citrate)Gold
Reporting Units%
Reference RangeAntithrombin 3
Protein C
Free Protein S (Male)
Free Protein S (Female – except pregnancy, oral contraceptive HRT)
AvailabilityNDDH: Batch tested once per month only.
Target turnaround timeBatch tested: Up to 1 month.
Special requirements & notesFresh specimens required. Contact Lab to discuss guidelines for testing.
Patient preparationN/A
Volume required1 x Purple, 3 x Blue & 1 x Gold tubes.
All tubes must be full.
If delayed transport to lab, store:Must be received in the laboratory no later than 1 hour after taking the samples.
Factors affecting result interpretationAnticoagulation and pregnancy
Time limit for add on testAdd on test not possible
Pathology disciplineHaematology
‘Lab Tests Online’ link

Last updated: July 16, 2021