ACOG technical bulletin. Blood component therapy. Number 199--November 1994 (replaces no. 78, July 1984). Committee on Technical Bulletins of the American College of Obstetricians and Gynecologists

Component therapy is the standard method for most transfusion needs and has made the use of whole blood rarely necessary. By giving only the specific component that is needed, blood component therapy usually provides better treatment. Because blood and blood products are in short supply and most carry some risk of infection, the National Institutes of Health guidelines for the use of each component should be followed closely. When significant blood loss is anticipated, autologous predonation should be considered and discussed with the patient.

Published by International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics, 1995. The guideline itself is at the source linked here.

pubmed.ncbi.nlm.nih.gov/7789606/