Protein S Activity
7 days
The patient plasma is added to PS-depleted normal plasma with normal levels of all factors but PS. The mixture is supplemented with excess aPC and factor V is then added. The extent of prolongation of the time to clot formation after calcuim chloride is added is proportional to plasma PS activity.
Accredited Laboratory Partner
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Assesses the activity of protein S. Differentiates between functional and quantitative deficiencies.
Plasma
1 mL
Blue top (sodium citrate) tube
Avoid warfarin (Coumadin®) therapy for two weeks and heparin therapy for two days prior to the test. Do not draw from an arm with a heparin lock or heparinized catheter.
This test does not require any special collection or pre-analytical handling. Follow routine specimen collection protocols.
| Temperature | Period |
|---|---|
| Frozen | 28 days |
| Freeze/thaw cycles | Stable x3 |
Protein S Activity
7 days
The patient plasma is added to PS-depleted normal plasma with normal levels of all factors but PS. The mixture is supplemented with excess aPC and factor V is then added. The extent of prolongation of the time to clot formation after calcuim chloride is added is proportional to plasma PS activity.
Accredited Laboratory Partner
Contact Technical Support
Assesses the activity of protein S. Differentiates between functional and quantitative deficiencies.
Plasma
1 mL
Blue top (sodium citrate) tube
Avoid warfarin (Coumadin®) therapy for two weeks and heparin therapy for two days prior to the test. Do not draw from an arm with a heparin lock or heparinized catheter.
This test does not require any special collection or pre-analytical handling. Follow routine specimen collection protocols.
| Temperature | Period |
|---|---|
| Frozen | 28 days |
| Freeze/thaw cycles | Stable x3 |