The NOW™ is a diagnostic instrument specifically designed for decentralized and resource limited settings, to make CD4 and CD4% available, accessible and affordable. The NOW™ is fully automated, requires no manual sample handling or pipetting, and requires no cold chain. In addition to CD4 and CD4%, the NOW provides four-part haematology differential and haemoglobin concentration on every sample. The NOW enables: a) decentralized testing – for near-patient services and b) immediate results – for single visit treatment.