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Dilute Russell Viper Venom Time
MessagePerformed in the Hematology Laboratory x5475, 76.
Test Code
N/A (see LASCR)
Alias/See Also
Part of the LASCR panel (Lupus Anticoagulant).
Cannot be ordered as a stand alone test.
Cannot be ordered as a stand alone test.
CPT Codes
85613
Preferred Specimen
Plasma
Minimum Volume
2.7 mL sodium citrate plasma. Sample MUST be drawn to minimum fill line on tube or the sample will be rejected as QNS.
Instructions
If drawn with other coagulation assays: For up to 2 tests draw 1, 2.7 mL sodium citrate tubes.
For 3 or more coagulation tests, draw 2, 2.7 mL sodium citrate tubes.
For 3 or more coagulation tests, draw 2, 2.7 mL sodium citrate tubes.
Transport Container
Light Blue Top (Sodium Citrate), 2.7 mL draw
Transport Temperature
Room Temperature
Specimen Stability
Refrigerator Stability: 4 hours
Plasma is stable for 6 months frozen at -70C
Plasma is stable for 6 months frozen at -70C
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis, QNS, clotted
Methodology
optical/clotting
Setup Schedule
Performed 1-2x /week depending on volume, weekdays between 8am - 4pm
Limitations
Screen and Confirm results are not affected by hemoglobin up to 125 mg/dL, bilirubin up to 13 mg/dL, UF and LMW heparin up to 1.0 U/mL.
LA assays based on different properties appear to be more or less sensitive to certain subgroups of LAs. Therefore, at least two screening assays, based on different properties, should be performed before the possibility of lupus anticoagulants are excluded.
LA assays based on different properties appear to be more or less sensitive to certain subgroups of LAs. Therefore, at least two screening assays, based on different properties, should be performed before the possibility of lupus anticoagulants are excluded.
Reference Range
Negative
Clinical Significance
A test for Lupus anticoagulants.
