Summary: Adapting the concept of "bed-side" patient analysis, the Boehringer-Mannheim Reflotron® was evaluated for its possible use in veterinary medicine under outdoor-field conditions.Horse blood was analysed with the Cobas Bio analyzer, and indoor and outdoor analyses were also performed with the Reflotron®. All values showed close agreement with no significant differences. Good correlation coefficients (r values around 0.9000) were also seen between all methods used.The Reflotron® was operated under outdoor-field conditions by using, whenever available, an on-farm electricity source, or a gas operated generator.The data supports the proposal to adapt the Reflotron® (or any other proved system) for outdoor-field, patient-side blood analysis, thus providing the veterinary clinician with values for blood quantities, and enabling an improved and more complete diagnosis.