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  2. CQM-6744

CMS314v1 - Viral Load numerator threshold

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      Revised response posted 2/20/24: Thank you for your inquiry specific to CMS314v1 (HIV Viral Suppression). We do not have guidance on the conversion of an HIV viral load result in IU/mL to copies/mL. As you noted in your question, the conversion of the result is dependent on the laboratory instrument used. Providers reporting this measure would need to contact the laboratory processing the blood specimens to obtain information on calculating the conversion based on the equipment used by that particular laboratory.


      Original response posted 2/9/24: Thank you for your inquiry specific to CMS314v1 (HIV Viral Suppression). In the United States, HIV viral load results are only reported in logs or copies/mL. There is no need to address an international unit (IU)/mL conversion.

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      Revised response posted 2/20/24: Thank you for your inquiry specific to CMS314v1 (HIV Viral Suppression). We do not have guidance on the conversion of an HIV viral load result in IU/mL to copies/mL. As you noted in your question, the conversion of the result is dependent on the laboratory instrument used. Providers reporting this measure would need to contact the laboratory processing the blood specimens to obtain information on calculating the conversion based on the equipment used by that particular laboratory. Original response posted 2/9/24: Thank you for your inquiry specific to CMS314v1 (HIV Viral Suppression). In the United States, HIV viral load results are only reported in logs or copies/mL. There is no need to address an international unit (IU)/mL conversion.
    • CMS0314v1

      The following numerator logic definition specifies the load quantity to compare based on  '{copies}/mL' unit of measure

      Recent Viral Load Test During Measurement Period".result < 200 '{copies}/mL'

      The results for several of the laboratory test included in the 'HIV Viral Load' valueset can be obtained using 'IU/mL' unit of measure (instead of copies/mL). While researching the appropriate conversion rate to convert 'IU/mL' to '{copies}/mL' we have found out that the conversion rate depends on the laboratory instrument used for the testing. This creates a challenge to accurately determine if the viral load result is less than 200 copies/mL.

      Can you please provide guidance on the appropriate conversion when EHR includes data for viral load using 'IU/ml'?

       

      Below are 2 examples of the conversion rates we found. Based on these, results in 'IU/mL' could meet or not the numerator logic (depending on the lab instrument used)  

      Conversion Rate: 1 IU = 0.58 copies (Lab instrument A)

      Result in IU/ml Converted to copies/mL
      344.83 200

      Conversion Rate: 1 IU = 0.6 copies (Lab instrument B)

      Result in IU/ml Converted to copies/mL
      333.44 200

       

            edave Mathematica EC eCQM Team
            isbelia Isbelia Briceno
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