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Lupus Anticoagulant Evaluation with Reflex
PTT-LA and dRVVT with Reflex Confirmations
If PTT-LA is >40 seconds, Hexagonal Phase Confirmation will be performed at an additional charge (CPT code(s): 85598).
If Hexagonal Phase Confirmation is positive or weakly positive, Thrombin Clotting Time will be performed at an additional charge (CPT code(s): 85670.
If dRVVT is >45 seconds, dRVVT Confirmation will be performed at an additional charge (CPT code(s): 85597).
If dRVVT Confirmation is positive, dRVVT 1:1 Mixing Study will be performed at an additional charge (CPT code(s): 85613).
Photo-Optical Clot Detection
Expected impact by therapeutic levels (potential interference depends upon drug concentration): Warfarin: no effect (panel includes mixing studies which correct for Warfarin-induced factor deficiencies); Heparin (UFH or LMWH): possible to misclassify as LA; Dabigatran or Argatroban (Thrombin Inhibitors): panel includes Thrombin Time (TT) which detects thrombin inhibitors, unable to detect if TT significantly abnormal; Rivaroxaban or Apixaban (Factor Xa Inhibitors): possible to misclassify as LA.
|Lupus Anticoagulant||Not detected|
|PTT-LA Screen||≤40 sec|
|DRVVT Screen||≤45 sec|
To view specimen requirements and codes please Select a regional laboratory.
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Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.
The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.
* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.