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Test & Collection Guide

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Protein S

Alternate names:
PS
Laboratory:
Coagulation
Test Code:
PROTSF
Specimen types:
Plasma
Container types:
Sodium CitrateSodium Citrate
Collection Instructions:
Transport specimen at Room Temperature to lab

Fill to label marker and mix by inversion

Do not use 1 ml citrate tubes.

2 x 3.5 mL citrate tubes sufficient for Protein C, Protein S and Antithrombin 3.

Minimum Adult Volume:
7 mL
Notes:

Results not valid if patient receiving warfarin therapy or with acute thrombotic event

Warfarin falsely lowers Protein S level.

Fill to label marker and mix by inversion

Do not use 1 ml citrate tubes.

2 x 3.5 mL citrate tubes sufficient for Protein C, Protein S and Antithrombin 3.

Frequency:
Weekly
Result Turnaround Time:
2 weeks
Reference Interval:

Protein S Free                  50-134 %

Laboratory Use Only
Storage Instructions:

Specimens for Protein S assays kept at room temperature, should be centrifuged and tested within 4 hours of time of collection. 

If testing is not complete within 4 hours, plasma should be removed from the cells (2 X 1 mL Eppendorf tubes) and frozen at -20 C for up to 2 weeks or -70 C for up to 6 months. 

A frost-free freezer should not be used.