Blood-Component Preparation, Preservation, and Storage (Red Cells, Plasma, Platelets, Cryoprecipitate)

Component preparation is the blood-bank process that separates a single whole-blood donation, or an apheresis collection, into red cells, plasma, platelets, and cryoprecipitate, each stored under conditions tailored to its biology. The approach lets one donation serve several patients and gives clinicians a specific product for a specific deficit rather than whole blood.

Definition

Blood-component preparation and storage is the set of blood-bank techniques by which whole blood or apheresis collections are separated into red cells, plasma, platelets, and cryoprecipitate and held under component-specific conditions that preserve function until transfusion.

Scope

This topic covers how donated blood is fractionated, the anticoagulant-preservative chemistry that keeps red cells viable, the differing temperatures and shelf-lives of each component, processing steps such as leukoreduction, and the progressive biochemical changes known as the storage lesion. It is a reference account of component manufacture, not instructions for ordering or administering blood.

Core questions

• How is whole blood separated into its therapeutic components?
• What storage conditions and shelf-lives apply to red cells, plasma, platelets, and cryoprecipitate?
• What is the red-cell storage lesion, and does the age of stored blood affect outcomes?
• Why and how are components leukoreduced or further modified before issue?

Key concepts

• Centrifugal separation and apheresis
• Anticoagulant-preservative and additive solutions
• Red-cell storage lesion
• Platelet storage at room temperature
• Fresh-frozen plasma and cryoprecipitate
• Leukoreduction

Mechanisms

Whole blood is separated by differential centrifugation, or collected selectively by apheresis, into a red-cell concentrate, plasma, and a platelet fraction; cryoprecipitate is the cold-insoluble portion recovered when plasma is thawed slowly. Red cells are refrigerated in anticoagulant-preservative and additive solutions that supply metabolic substrate and buffer storage changes; platelets are kept near room temperature with continuous agitation to maintain function; plasma is frozen to preserve labile coagulation factors. Over storage, red cells undergo the cumulative biochemical and morphological changes of the storage lesion, but randomised trials comparing fresher with standard-issue blood have not shown a clinical benefit from preferentially using fresher units (lacroix-2015, carson-2016). Components are commonly leukoreduced by filtration to lower the risk of certain reactions (carson-2017).

Clinical relevance

The way components are prepared and stored determines what products are available, how long they last, and which modifications can be requested for particular patients. This entry describes manufacturing and storage science and the evidence about storage age; it does not provide guidance on selecting, ordering, or administering products for an individual patient.

Evidence & guidelines

The AABB guideline that addresses red-cell transfusion also reviewed storage duration and concluded that standard-issue (rather than freshest-available) blood is appropriate, consistent with large trials such as the ABLE study that found no benefit from fresher red cells (carson-2016, lacroix-2015).

History

Storage of blood became practical with the development of citrate anticoagulation and later acid-citrate-dextrose and additive solutions that extended shelf-life. The shift from transfusing whole blood to component therapy, and the routine adoption of leukoreduction, transformed blood banking into a manufacturing discipline (klein-2007).

Debates

Does the age of stored red cells matter clinically?

The storage lesion raised concern that older units might be less effective or more harmful, but multiple randomised trials, including ABLE, found no outcome advantage to using fresher blood, supporting continued issue of standard-aged units.

Seminal works

• carson-2016
• lacroix-2015
• carson-2017

Frequently asked questions

Why are platelets stored at room temperature while red cells are refrigerated?

Platelet function is best preserved near room temperature with gentle agitation, whereas red cells survive longer when refrigerated in a preservative solution; their different biology dictates different storage conditions and shelf-lives.

Should the freshest available blood be requested?

Randomised trials comparing fresher with standard-issue red cells have not shown better outcomes with fresher blood, so blood banks generally issue standard-aged units rather than reserving the freshest stock.