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Lab Manual for Moffitt-Long and Mount Zion

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von Willebrand Panel

Item Value
Approval req'd? No
Available Stat? No
Test code VWP
Test group von Willebrand
Performed by Parnassus Hematology
Collection Instructions 1. Check the expiration date on the label of the blue top vacutainer before drawing the patient.

2. For blood collection in a sodium citrate blue top, the tube must be filled to above the Minimum Fill Indicator on the tube. It is crucial to wait and allow the tube to stop filling before removing it from the needle.

3. With use of a butterfly needle, draw about 1 cc using a separate blue top to remove air from tubing, discard the first tube and then draw a second blue top tube filled to the full extent of the vacuum.

4. Tubes should not be filled past the Maximum Fill dashed line by either using a syringe or removing the tube cap.

For patients with Hct's ≥ 55% please contact Hematology (415-353-1747) to obtain blue top tubes with adjusted citrate volumes in order to maintain the proper citrate to plasma ratio for coagulation studies.
Container type Blue top filled to full extent of vacuum x2
Amount to Collect 5.4 mL blood
Sample type Citrated plasma
Preferred volume 2 mL plasma
UCSF Rejection Criteria Samples collected in outdated blue top vacutainer. Over-filled or under-filled tubes may be rejected
Processing notes Freeze plasma in plastic at -20C.

Contains test codes: F8,VWFAG, RCOF
Normal range
Synonyms vwd
Turn around times Test run q1-2 weeks. Turnaround time: 1-4 weeks.
Additional information This panel includes Factor VIII Activity, Ristocetin Cofactor, and Von Willebrand Factor Antigen.

For additional information, see entries for individual panel members.
LOINC code 48593-8
Last Updated 8/23/2013 1:58:36 PM
Entry Number 1006

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

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