At our hospital, ALL babies have a cord blood come down to the Blood Bank. Cord Workups (ABO, Rh, DAT) are ordered on babies of Rh neg moms. The rest are "held" for 2 weeks. Once or twice a month we get a request for a workup on a baby to R/O ABO incompatibility. By holding our specimens, the pediatricians can order the testing even after the baby has been discharged.