Acquired Factor XIII Deficiency in Critical Care: Registry-Based Analysis of Features, Symptoms and Risk Factors.

BackgroundFactor XIII (FXIII) deficiency increases bleeding risk and delays wound healing, yet its recognition, diagnosis, and treatment remain challenging in the complex clinical routine.ObjectiveTo determine real-world diagnosis and management strategies of acquired FXIII deficiency.MethodsAdult patients undergoing FXIII activity testing (diagnostic phase) and FXIII supplementation (treatment phase) for acquired FXIII deficiency were consecutively enrolled in this retrospective data collection. Treatment outcomes were analyzed in patients with postsurgical bleeding and wound healing disorders (WHD).ResultsA total of 255 patients were included in the diagnostic cohort, of whom 84% were diagnosed with clinically relevant FXIII deficiency and 77% received FXIII supplementation. Median FXIII activity in patients with a clinically relevant deficiency was 42.5%, compared to 74.0% in those without. Most patients with FXIII activity levels below 60% were considered to have a clinically relevant deficiency. The treatment cohort comprised 96 postsurgical bleeding cases and 78 WHD cases. Median FXIII activity levels were similarly reduced in both cohorts (44.0% vs 48.0%). Conventional coagulation tests remained mainly within reference ranges for most patients, highlighting the diagnostic gap. Persistent infection was the leading comorbidity, affecting 33% of patients in both cohorts.ConclusionIn this real-world setting, FXIII supplementation was most frequently initiated at FXIII activity levels below 60%-70%. These findings suggest using this range as a clinical reference point for therapeutic intervention, while bearing in mind the exploratory nature of the data. Routine FXIII testing should be considered in patients with unexplained bleeding or impaired wound healing, particularly perioperatively, after major trauma, or with persistent infections.