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. Author manuscript; available in PMC: 2015 Oct 1.
Published in final edited form as: AIDS Care. 2014 Apr 30;26(10):1318–1325. doi: 10.1080/09540121.2014.911813

Figure 1.

Figure 1

Algorithm for the Determination of HIV Status using EMR Data. The algorithm uses logical and temporal criteria to classify all patients as having known HIV status (HIV-positive or negative) or unknown HIV Status. EMR indicates electronic medical; ICD9, International Classification of Disease, 9th Revision; VL, viral load; UD, undetectable; WB, HIV Western blot; Ab, HIV antibody test.