CPT® Code 85612

1. Indications

The Russell viper venom time (RVVT) test, coded as CPT® 85612, is indicated for the evaluation of patients who may have bleeding disorders or abnormalities in blood coagulation. The specific indications for performing this test include:

• Assessment of Coagulation Disorders The RVVT is utilized to detect deficiencies in certain blood clotting factors, which can lead to bleeding complications.
• Evaluation of Unexplained Bleeding This test is performed in patients presenting with unexplained bleeding episodes, helping to identify underlying coagulation issues.
• Preoperative Assessment The RVVT may be indicated as part of a preoperative workup to ensure that patients do not have undiagnosed bleeding disorders that could complicate surgical procedures.

2. Procedure

The procedure for conducting the Russell viper venom time (RVVT) test involves several key steps, which are outlined as follows:

• Step 1: Blood Sample Collection A blood sample is obtained from the patient, typically via venipuncture. This sample is essential for the subsequent analysis and must be collected in a manner that prevents contamination and ensures accurate results.
• Step 2: Preparation of the Sample The collected blood sample is processed to separate the plasma, which is the liquid component needed for the RVVT. This step is crucial as the test specifically evaluates the plasma's coagulation properties.
• Step 3: Addition of Undiluted Russell Viper Venom The undiluted Russell viper venom is then added to the patient’s plasma. This venom acts as an activating agent, initiating the coagulation process and allowing for the measurement of clotting time.
• Step 4: Measurement of Clotting Time The clotting time is measured using photo-optical methods, which provide a precise assessment of how long it takes for the blood to clot in the presence of the venom. This measurement is critical for determining the presence of deficiencies in clotting factors.

3. Post-Procedure

After the RVVT test is completed, the patient may be monitored for any immediate reactions, although the procedure is generally safe and well-tolerated. The results of the test will be analyzed and interpreted by a qualified healthcare professional, who will consider the findings in conjunction with the patient's clinical history and other diagnostic tests. Depending on the results, further testing or treatment may be recommended to address any identified coagulation issues. It is important for healthcare providers to communicate the results to the patient and discuss any necessary follow-up actions or interventions.