In 2015, under ASLM’s leadership, some Diagnostic Access Initiatives (DAI) partners including, SCMS, CHAI, MSF, and USAID jointly developed a comprehensive viral load (VL) costing model that incorporates CD4 testing, which helps estimate testing need, commodity and systems costs. This is a vital aid, because, in order to define scale-up plans, determine funding gaps and handle supplier negotiations for lower costs based on testing volumes, countries need to understand the all-inclusive cost of HIV VL and CD4 testing. Please follow the links below to download the helpful user guide and the two costing models.