Item Value
Test name Ristocetin Cofactor Activity
Available Stat? No, Contact hematology x3-1747 for special testing needs.
Turn around times 1-14 days
In House Availability Performed once every 1 - 2 weeks from 0800 - 1600
Performed by Parnassus Hematology
Normal range 42-191%
Container type Blue top filled to full extent of vacuum
Amount to Collect 2.7 mL blood
Collection Instructions Check the expiration date on the label of the blue top vacutainer before drawing the patient.

Avoid collecting when patient may be lipemic as this may result in sample rejection.
Sample type Citrated plasma

If you have additional questions regarding this test, please call: 415-353-1667