Blood
Collect blood in both tubes. Minimum one EDTA (lavender top) tube with at least 3 mL of whole blood; pediatric collection of 4–5 mL in a single tube is acceptable. Multiple tests can typically run from one 3 mL sample.
Ship the same day as collection. If that is not possible, refrigerate at 2–8°C and ship within 24 hours.
Overnight, Monday–Thursday, in the pre-labeled FedEx Clinical Pak. A cold pack is recommended in warmer months.
Patients who have received an allogeneic bone marrow or stem cell transplant (donor DNA — cultured fibroblast DNA is required instead). Transfusions within two weeks may impact results. Specimens are rejected if frozen, hemolyzed, clotted, or unlabeled.

