Data Methods

Learn more about the data that informs AHEAD.

Two people looking at each other, smiling

Diagnoses indicator icon Diagnoses

HIV diagnoses refers to the number of people who have received an HIV diagnosis during a given time period, regardless of when they became HIV+. Some people may live with HIV for years before they are actually diagnosed, while others are diagnosed soon after acquiring HIV. The baseline value of the HIV diagnoses indicator was calculated using National HIV Surveillance System (NHSS) data from January 1, 2017 through December 31, 2017 and reported to CDC through December 31, 2019. Diagnosis data includes persons aged ≥13 years with confirmed laboratory evidence of HIV infection. Diagnosis data is based on residence at the time of diagnosis and is updated quarterly. It is important to note that data presented by quarter are preliminary and include the cumulative number of HIV diagnoses through the specified quarter of the calendar year. 

Formula for the Diagnoses indicator


More information can be found at: HIV Surveillance Report 2019, Volume 32