Quality Assurance and precision of PIMA.

A. Internal Quality control using manufacturer provided bead standard controls Normal (mean 957, range 670–1244 cells/µl) and Low (mean 192, range 132–252 cells/µl). (Site 1: Urban Laboratory, Site 2: Urban Clinic, Site 3: Rural Laboratory, Site 4: Rural Clinic, Site 5: Rural Clinic). B. QASI External Quality Assurance Panel each sample tested in replicate by a single laboratory technician at the reference laboratory, Central Public Health Laboratory (CPHL). C. Assessment of assay precision using replicates from the same blood sample run in duplicate by a single laboratory technician. n = sample size,B. SD = standard deviation, CV = coefficient of variation, QASI = Quality Assurance Scheme for Immunology (Public Health Agency of Canada).Quality Assurance and precision of PIMA.