Interpreting the hazard zone: Factor V and lactate as critical indicators in severe early allograft injury

Graft failure is the worst complication of organ transplantation. Considering liver transplantation, aminotransferase levels have been demonstrated to be a precursor of severe graft failure, in particular when they exceed 5000 U/L in the immediate post-operation. However, some studies show that the outcome of the transplanted liver is not determinable by biochemistry alone. One of the most relevant studies is the one published by Lazzarotto-da-Silva et al. In this retrospective study, 341 transplanted livers are considered. In 25 cases, this severe biochemical insult has been reported. But despite this event, more than half had significant long-term survival. One of the most valuable elements that emerge from this work is the identification of two easily measurable markers - serum factor V and arterial lactate, which independently can indicate the graft’s 90-day outcome. This finding provides a key clinical picture to distinguish patients who are most likely to recover from those destined for irreversible graft loss. In a time where organs are increasingly scarce, these discoveries could facilitate more prudent use of retransplantation, improving both individual outcomes and the overall distribution of resources. This study contributes significantly to a deeper understanding of early graft injury, although larger prospective studies are needed. It highlights the need to move beyond singular value thresholds and toward integrated, evidence-based decision making during the crucial early post-transplant period. This study not only captures risk but also provides a tool for intervention.