Importantly, it is frequently desirable to perform multiple FS tests for a given patient, such as those being evaluated for possible HIV treatment (e.g. HIV test, CD4 count, liver/kidney function, hemoglobin), for suspected malaria (e.g. malaria test, G6PD test, hemoglobin), or for routine antenatal care (e.g. HIV test(s), syphilis test, hemoglobin, blood typing). The gene discussed is CD4; the disease is malaria.