Table 2 Key variables of interest and data sources at the hospital

• Dates of each HEI follow-up visit

• DBS Dispatch Register

• Lab

• Purpose of visits

• EID Follow-Up Cards

• ART Clinic

• Whether test results received

• EID Data Register

• Antenatal Clinic

• When test results received

• Transport Refund Register

• Postnatal Clinic

• Breastfeeding status

• Test result slips for HEI

• Immunization Clinic

• Provision of Cotrimoxazole prophylaxis

• Homemade clinic attendance registers

• Outpatient Department

• Clinical care indicators

• Homemade HEI clinic attendance registers

• Feeding Units

• When due for 2nd PCR

• Homemade follow-up register for HIV-exposed infants

• Pediatric Ward

• Whether transport refund given

• Antenatal, Postnatal & Immunization Registers

• Maternity Ward

• Dates of sample dispatch and result return to facility

• Pediatric Ward Register

• Adult Wards

• Referring clinic (entry point for HEI)

• Outpatient Register

• HIV+: If/when enrolled at ART clinic

• Pre-ART & ART Registers

• HIV+: Dates of each visit at ART clinic

• Patient files for HIV+ patients

• HIV+: If initiated on ART and when

• HIV+: CD4 tests and clinical stage