In the Urgent Surgery/Invasive Procedure trial, mean infusion time was 21 minutes for Kcentra and 141 minutes for plasma. Unlike fresh frozen plasma (FFP), Kcentra does not require thawing or ABO typing. Kcentra can be stored at room temperature for up to 36 months.Click to see full answer. Considering this, how long does Prothrombinex last?Box 4. Prothrombinex-VF is able to completely reverse an excessive INR within 15 minutes, but the infused clotting factors have half-lives similar to endogenous clotting factors. Therefore, vitamin K1 5–10 mg should be given intravenously with the PCC to sustain the reversal effect.Subsequently, question is, how long does it take for Vit K to reverse warfarin? approximately 24 hours Moreover, how is Kcentra calculated? A single dose of Kcentra is determined by the patient’s pretreatment INR and weight. Dosing is based on body weight. Dose based on actual potency is stated on the vial, which will vary from 20–31 Factor IX units/mL after reconstitution. The actual potency for 500 unit vial ranges from 400–620 units/vial.How quickly does FFP affect INR?In multivariable analysis, shorter time to vitamin K, as well as FFP, predicted INR correction. Every 30 minutes of delay in the first dose of FFP was associated with a 20% decreased odds of INR reversal within 24 hours (odds ratio, 0.8; 95% CI, 0.63 to 0.99).