BACKGROUND: The Association for the Advancement of Medical Instrumentation (AAMI) has guidelines and standards for the performance and accuracy of automated blood pressure monitors.METHODS: We performed two validation studies for the CAS model 9010 oscillometric blood pressure monitor, one in children and adults using a sphygmomanometer-auscultation standard, and one in newborns using an intra-arterial catheter pressure standard. In the former study, 88 participants from 4 to 78 years of age with widely varying blood pressures were enrolled. In the latter, 35 newborn children with umbilical artery catheters in place took part. RESULTS: The accuracy of the readings from the model 9010 met all AAMI standards. CONCLUSION: This monitor can be used from the premature through to the elderly.