OBJECTIVE The capnometry values during resuscitation are an evolutive predictor of kidneys obtained from uncontrolled non-heart beating donors. METHODS The study comprised a retrospective onset cohort of 37 non-heart beating donors and a validation cohort of 55 trasplanted kidneys in the period 2013-2017. METHODS The population served by the emergency service and referred to Hospital Universitario Doce de Octubre (Madrid, Spain) as potential uncontrolled non-heart beating donors. METHODS A total of 55 renal transplant patients subjected to hemodialysis and with grafts from uncontrolled non-heart beating donors. METHODS Capnometry and capnography measurements in potential uncontrolled non-heart beating donors. METHODS Capnometry values recorded initially and at transfer in hospital for comparison with the viability of the extracted kidneys; renal failure and delayed renal function. RESULTS A total of 55 out of 74 extracted kidneys were trasplanted (74.3%). The rest were ruled out due to poor perfusion or signs of ischemia. An association was observed (P=.016) between the capnometry values during resuscitation in the grafted kidneys (μ=22.8 mmHg) and in the kidneys discarded for transplantation (μ=17.35 mmHg). CONCLUSIONS Capnometry during resuscitation serves as a marker to be taken into account in relation to the viability of the trasplanted organs in uncontrolled non-heart beating donors.