RESUMEN
A comparative statistical analysis was performed to detect various types of specimens and organisms used in the microbiology Quality Assessment Programme in Kuwait for 16 participant laboratories. A total of 139 samples were used during a period of 6 years. Organisms had more effect than specimens on the performance of the various laboratories. Samples prepared with one organism [fluids] obtained the highest mean scores, followed by mixtures prepared as wound swabs, stool, and material obtained from the respiratory and genital tracts. Organisms were sorted into five groups and the analysis gave high mean score performances in the following order: Entero-bacteriaceae, Micrococcaceae, other gram-positive organisms, other gram-negative bacteria and non-fermenters. The results of our experience will prove useful in improving the performance of various laboratories of Kuwait