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Crossmatch

Item Value
Approval req'd? No
Available Stat? Yes
Test code XM-Standard
XMAG-w/ Coombs
XMPW-w/ prewarming to 37C
XMPG-w/ Ployethylene Glycol (PEG)
Performed by Blood Bank
In House Availability Test available 24 hours per day 7 days per week
Collection Instructions Use BLOOD BANK requisition. Specimen label must contain the date the sample was collected and the legible name of the person who collected the sample.
Container type Lavender top (6 mL size preferred)
Amount to Collect 6 mL blood
Sample type EDTA whole blood
Preferred volume
Patient Age EDTA (Purple top) Volume
< 4 mo Full Microtainer (0.8 mL)
4 mo - 1 year 3 mL
1 -18 years. 3-6 mL (3 mL OK for small children)
> 18 years 6 mL


Check Specimen:
< 4 mo Full Microtainer (0.8 mL)
> 4 mo 3 mL
Min. Volume
Patient Age EDTA (Purple top) Volume
< 4 mo Full Microtainer (0.8 mL)
4 mo - 1 year 1 mL
1 -18 years. 3 mL
> 18 years 5 mL


Check Specimen:
< 4 mo Full Microtainer (0.8 mL)
> 4 mo 1 mL
UCSF Rejection Criteria Unsigned, mislabeled or unlabeled sample
Normal range See Additional Information
Turn around times STAT 1 hour, ASAP 2 hours, Routine 4 hours
Additional information 3 mL may suffice for an infant < 4 months old if blood is not needed to cover surgical losses. This test is always ordered in conjunction with a separately charged Blood Typing and Antibody Screen, and cannot be ordered by itself. The Coombs test is employed when the antibody screen is positive; the various other modifications to the standard crossmatch are used to overcome the effects of non-specific cold-reactive antibodies.

see also HLA Crossmatch
Last Updated 2/19/2010 3:38:28 PM
Entry Number 268
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