Item Value
Test name Russell's Viper Venom Test
Available Stat? No
Turn around times 2-9 days
In House Availability Test run once per week (Tuesday)
Performed by Parnassus Hematology
Normal range
RVVT 28.3 - 45.3 seconds

RVVT Inhibitor Screen 33.4 - 42.5 seconds
Phospholipid Confirmatory Ratio 0.90 - 1.09


See 'Additional Information' for interpretation of negative RVVT results.
Container type Blue top x2 filled to full extent of vacuum
Amount to Collect 2.7 mL blood
Collection Instructions When lupus anticoagulant testing is requested, it is appropriate to perform BOTH the RVVT and Lupus Anticoagulant by HEXA tests. For this reason, both will be performed whenever either is ordered. In the uncommon circumstance that a provider wishes to perform only one of these tests, the hematology laboratory should be contacted at 353-1747 to request that only the single test be performed.

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 (x3-1747) to obtain blue top tubes with adjusted citrate volumes in order to maintain the proper citrate to plasma ratio for coagulation studies.
Sample type Citrated plasma

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