A crossmatch is a group of tests undertaken before a person requires a blood transfusion. The transfusion laboratory completes a group and screen to establish the person's blood group and identify any possible red cell antibodies that may be present in their blood.
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1 24 hour nurse hotline: Members can speak to a real registered nurse 24 hours a day for general medical advice. 2  Members should call 1-866-444-3008 pin #382. 3  HealthLink@hopkins: This is the secure web portal for members' personal health information. 4  Members can login and register at hopkinsmedicine.org/usfhp.