Table 1. HHS and IOM quality of care indicators assessed using DC Cohort study data^a.

HHS Measure	HHS definition	IOM measure	IOM definition
Retention-in-care	Proportion of HIV+ persons who had ≥1 HIV medical care visit in each 6-month period of the 24 month measurement period, with ≥60 days between the first medical visit in the prior 6 month period and the last medical visit in the subsequent 6-month period among those with ≥24 months of follow-up	Proportion in continuous HIV care	Proportion of HIV+ people who had ≥2 routine HIV medical care visits or a CD4 or viral load test in the preceding 12 months ≥ 3 months apart among those with ≥12 months follow-up
ARV therapy among persons in HIV medical care	Proportion of HIV+ persons who are prescribed ART in the 12-month measurement period among those with ≥12 months follow-up and ≥1 visit	Regular CD4 testing for monitoring immune function	Proportion of HIV+ people who received ≥2 CD4 tests in 12 months since enrollment among those with ≥12 months follow-up
Viral load (VL) suppression among persons in care	Proportion of HIV+ persons with a viral load <200 copies/ml at last test in the 12–month measurement period among those with ≥12 months follow-up and ≥ 1 visit and ≥ 1 VL	Regular VL monitoring for clinical progression	Proportion of HIV+ people receiving ≥≥2 VL tests in 12 months since enrollment among those with ≥12 months follow-up
Housing instability	Proportion of HIV+ persons who were homeless or unstably housed in the 12-month measurement period among those with ≥12 months follow-up with housing information recorded	Maintenance of immune function to reduce risk of opportunistic infections and cancer	Proportion of HIV+ people in continuous care for ≥12 months and with a CD4+ cell count ≥350 cells/mm3 among those in continuous care for ≥ 12 months
		Screening for Gonorrhea	Proportion of HIV+ people who were screened for Gonorrhea ≥1 since enrollment among those with ≥12 months follow-up
		Screening for Chlamydia	Proportion of HIV+ people who were screened Chlamydia ≥1 since enrollment among those with ≥12 months follow-up
		Screening for Syphilis	Proportion of HIV+ people who were screened for Syphilis ≥1 since enrollment among those with ≥12 months follow-up

^aIOM = Institute of Medicine; HHS = Department of Health and Human Services.