# The impact of storage time on coagulation factor activity in FFP

## TL;DR

This study examines how the storage time of fresh frozen plasma affects its coagulation factor activity and finds that some factors decline significantly over time.

## Contribution

The study provides new insights into the degradation of coagulation factor VIII in FFP over extended storage periods.

## Key findings

- Coagulation factor VIII activity decreases by 19.35% after extended storage.
- The qualified rate of FVIII drops to 72% after 120 days of storage.
- PT and APTT values increase with storage time but remain within normal ranges.

## Abstract

This research aims to explore the change law of coagulation factor activity in fresh frozen plasma (FFP) with storage time under standard storage conditions, evaluate the quality change characteristics during its validity period, and provide scientific basis for optimizing the inventory management and turnover strategy of fresh frozen plasma in primary hospitals.

FFP under standard storage conditions (≤−18 °C) was followed up for 1 year (from the date of collection), and the activated partial thromboplastin time (APTT), prothrombin time (PT), international normalized ratio (INR) and factor VIII (FVIII) activity at different time points were measured, and the results were analyzed statistically.

The PT and APTT of FFP showed an upward trend with the extension of storage time, and remained within the normal reference range, but the growth rate of PT increased after more than 300 days. The activity of FVIII decreased by 19.35% compared with the baseline level, and the qualified rate was only 72% after 120 days of storage.

Under standard storage conditions, the coagulation function indexes (PT, APTT) of FFP remain normal, but the activity of some coagulation factors (such as FVIII) will decrease significantly with the extension of storage time and inventory management of fresh frozen plasma that been stored nearly 300 days should be enhanced.