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Laboratory Medicine

Test Directory / Crossmatch

Crossmatch

EDTA X 1

TestCrossmatch
Common Abbreviations
Specimen typeBlood
Sample typeBlood
Tube typeEDTA X 1
Minimum volume *4.9 ml
Special precautionsPatients’ spun samples are stored at 4-8 °C for 7 days and may be suitable for subsequent crossmatch requests.
Stability**up to 7 days
Turnaround times45 mins (URGENT) / Within 4 hours (ROUTINE)
LaboratoryYork and Scarborough
Reference interval
LimitationsBlood – [red cells] is provided in accordance with the agreed “surgical blood order schedule”. Exceptions to the schedule must be discussed directly with the laboratory staff. The detection of atypical antibodies and incompatibilities may cause unexpected and inevitable delays. Un-crossmatched blood may be issued on clinical demand only. Blood can now be issued electronically provided: • Two electronic groups exist on the database (one historical and one for the current situation) • The patient has no atypical antibodies present. Electronic issue (EI) enables blood to be available for the patient within 20 minutes rather than the serological issue of 45 minutes. The transfusion department will undertake the decision to EI. Haemolysis and lipaemia may affect results
** For paediatric patients, smaller volumes (approximately 1 ml) are acceptable – please contact the laboratory for further advice if necessary.
**** Largely dependent on patients serological status and recent transfusion history
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