Contributor: Nick Tsipis, MD Educational Pearls: Prothrombin complex concentrate (Kcentra)  and Vitamin K are used to reverse life-threatening bleeds in patients on warfarin (Coumadin) Factors II, VII, IX, and X are included in four-factor PCC PCC/Kcentra dosing is 500-2000 units based on INR and patient weight PROPER3 RCT was a non-inferiority trial done to evaluate standardized dosing of PCC/Kcentra versus variable dosing based on INR and weight Looked at end-points to assess hemostasis, but ultimately this trial did not show non-inferiority of standardized dosing compared to variable dosing References Abdoellakhan RA, Khorsand N, Ter Avest E, et al. Fixed Versus Variable Dosing of Prothrombin Complex Concentrate for Bleeding Complications of Vitamin K Antagonists-The PROPER3 Randomized Clinical Trial. Ann Emerg Med. 2022;79(1):20-30. doi:10.1016/j.annemergmed.2021.06.016 Summarized by John Spartz, MS4 | Edited by Erik Verzemnieks, MD   The Emergency Medical Minute is excited to announce that we are now offering AMA PRA Category 1 credits™ via online course modules. To access these and for more information, visit our website at https://emergencymedicalminute.org/cme-courses/ and create an account.  Donate to EMM today!