Pathology

Test & Collection Guide

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Protein S

Alternate names:

Laboratory:

Coagulation

Test Code:

PROTSF

Specimen types:

Plasma

Container types:

Sodium 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.

Samples must be transported to laboratory immediately. ( Within a maximun of 4 hours from collection time)

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

Minimum Adult Volume:

3.5 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.

1 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.