In some cases, reference samples may need to be collected from the donors of each unit of blood transfused to the victim during rescue surgery. Again, consult experts and discuss with defense counsel.

Reference Samples From Individuals Who Have Been Transfused

If an individual has received transfusions shortly before the collection of a blood sample (e.g., homicide victim), the DNA test results may indicate the presence of DNA from two or more sources. Generally the predominant DNA types reflect the types from the individual. However, other sources of reference samples for individuals who have received transfusions may need to be collected. These would include: blood-stained clothing or other material (bedding, etc.) and oral, vaginal, and other swabs in addition to the items listed above.