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The impact of adenine and inventory utilization decisions on blood inventory management
Insights
Extending red blood cell storage to 35 days using citrate-phosphate-dextrose-adenine (CPDA) significantly reduces outdates and shortages. However, careful inventory management remains crucial to fully realize these benefits.
Area of Science:
- Blood banking and transfusion medicine
- Health services research
- Operations research
Background:
- Current whole blood and red cell storage is limited to 21 days.
- Citrate-phosphate-dextrose-adenine (CPDA) extends storage to 35 days, potentially impacting inventory.
- Outdates and shortages are critical issues in blood supply management.
Purpose of the Study:
- To evaluate the impact of extending red blood cell storage to 35 days using CPDA on blood product outdates and shortages.
- To analyze the interplay between extended storage and inventory control parameters.
Main Methods:
- A simulation model was developed to analyze blood inventory dynamics.
- Input parameters included maximum storage age, demand/supply distributions, and inventory control variables.
- A full factorial design and multiple regression analysis were employed.
Main Results:
- Extending storage to 35 days can substantially decrease shortages and outdates.
- The benefits of extended storage are sensitive to inventory management practices.
- Relaxing inventory controls can negate the advantages of longer storage.
Conclusions:
- Extending red blood cell shelf life to 35 days offers significant potential for improving blood supply efficiency.
- Optimizing inventory management alongside extended storage is essential for maximizing benefits.
- CPDA anticoagulant and robust inventory control are key to reducing blood bank waste and shortages.
Abstract:
The use of citrate-phosphate-dextrose-adenine as an anticoagulant for whole blood increases the storage period permitted for whole blood and red cells from 21 to 35 days. A simulation model was used to analyze the possible consequences for outdates and shortages of the addition of adenine. The model accepts as input (1) the maximum age (21 or 35 days), (2) parameters describing the demand and supply distributions, and (3) parameters describing inventory control (crossmatch recycle period, transfusion fraction, deviation from optimal target inventory levels). These parameters were varied over wide ranges, and a full factorial design was carried out. The observed shortage and outdate rates were then related (via multiple regression) to the parameter values. The resulting shortage and outdate functions indicated the effect of parameter changes, including extending the lifetime from 21 to 35 days, and the joint effect of changing more than one parameter. Conclusions indicate that, while the contribution of an increased lifetime to reducing shortages and outdates can be substantial, this contribution can be easily dissipated by relaxing the tightness of other inventory management controls.