Children's Mercy Hospitals and Clinics
Name
Protein S, Functional

CMH Lab Section
Hematology

Specimen Requirements
2.7 mL in a sodium citrate light blue tube

Availability
Routine

Turn Around Time
Batched: once/wk Thursdays

Special Instructions
If activity is <60% antigenic testing will be performed.
Samples on patients < 6 months old will not be tested for functional Protein S; they will automatically be sent for Protein S Antigen testing.
Antigen testing is a sendout.

Processing Instructions
Send specimen to Hematology ASAP

Methodology
STAR
mechanical clot detection

Ranges
<6 months no ranges established
>6 months 70-140%

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