Laboratory services function at the cross cutting interface of all other divisions like Basic Services (ICTC), Care, Support and Treatment (ART), Blood Transfusion Services and Sexually Transmitted Infection division.The assurance of quality in HIV testing services is ensured through the implementation of External Quality Assessment Scheme (EQAS) by Reference laboratories at Both National and State level.
In TamilNadu, 3 National Reference Laboratories (NRL) and 12 State Reference Laboratories (SRL) are interlinked with all HIV Testing Facilities (ICTCs) of 32 Districts. Two NRLs and Five SRLs were accredited by National Accreditation Board for Testing and Calibration Laboratories (NABL). NACO supports all the reference laboratories to get NABL Accreditation.
There are 32 CD4 testing Facilities are functioning in the state and 3 type of CD4 machines available such FACS Calibur -3 ; FACS Count -21 and Partec in 8 numbers. National Institute for Research in Tuberculosis Chennai functioning as Viral Load Testing centre and Early Infant Diagnosis (EID) Testing Lab for the state.In TamilNadu, Madras Medical College, Chennai is the referral lab for HIV 2 Diagnosis.