CPT Code(s): 85610, 85730, 85613 When Confirmation Testing Performed, Additional Codes May Apply As Follows: 85670,85635,85525,85732,85613 X2,85598
$90
Test Details
Alternative Name(s)
Partial Thromboplastin Time – Lupus Anticoagulant: PTT-LA, Lupus PTT Dilute Russell’s Viper Venom Time: Russel Venom, DRVVT
Test Includes
Prothrombin Time Partial Thromboplastin Time – Lupus Anticoagulant Dilute Russell’s Viper Venom Time
Methodology
Automated Electromechanical Clot Detection
Rejection Criteria
Hemolysis Lipemia Thawed samples
Reference Range(s)
By Report
Specimen Requirements
Preferred Specimen
Sodium Citrate Light Blue Top Tube
Minimum Volume
2.5 mL Plasma
Sample Stability
Screen: 4 hours room temperature Unacceptable refrigerated 1 month frozen at -20 degrees C Prothrombin Time: 4 hours room temperature Unacceptable refrigerated 1 month frozen at -20 degrees C Partial Thromboplastin Time – Lupus Anticoagulant: 8 hours room temperature Unacceptable refrigerated 1 month frozen at -20 degrees C Dilute Russell’s Viper Venom Time: 4 hours room temperature Unacceptable refrigerated 1 month frozen at -20 degrees C
Transport Temperature
Critical Frozen
Collection Instructions
1. Fill a light blue top tube as far as vacuum will allow and mix by gentle inversion five to six times. The exact ratio of 1 part sodium citrate to 9 parts blood must be maintained. Inadequate filling of the sample tube will alter this ratio and may lead to inaccurate results. 2. Patients who have hematocrit values above 55% should have the anticoagulant adjusted to maintain the 1 to 9 ratio. 3. To obtain platelet-poor plasma, immediately centrifuge sample at 1500 RCFs for 15 minutes, then pipette the supernatant plasma and transfer to a plastic transport tube. 4. Re-centrifuge plasma in the plastic transport tube at 1500 RCFs for 15 minutes to ensure that no red cells are present. 5. Pipette the top two-thirds of the supernatant plasma and transfer to another plastic transport tube. 6. Immediately freeze the plasma at -20 degrees C or lower for transport. 7. When multiple tests are ordered, submit separate tubes for this test.