What does crossmatch mean?
A crossmatch is a critical laboratory procedure used in transfusion medicine and transplantation to confirm that donor blood or organs are compatible with a specific recipient. In the most common form, serum from the patient is mixed with red cells from the donated unit; if the patient's antibodies attack the donor cells, causing them to clump (agglutinate) or break apart (haemolyse), the unit is incompatible and must not be given. The term also works as a verb — laboratories crossmatch blood before issuing it. Crossmatching exists alongside ABO and Rh typing: typing establishes broad group compatibility, while the crossmatch catches less common but potentially dangerous antibodies. Because it takes time, true emergencies may use type O negative blood before a complete crossmatch can be finished, and some labs now rely partly on electronic crossmatching using validated computer records. Precise, clinical, and life-saving, the word is indispensable vocabulary in medicine.
A laboratory test in which a recipient's serum is mixed with a prospective donor's blood cells to verify compatibility prior to transfusion or transplantation.
"The crossmatch revealed an antibody incompatibility, so a different unit was selected."
Usually countable and often modified adjectivally, e.g. 'a compatible crossmatch', 'an emergency crossmatch'.
To perform a crossmatch test on (blood or tissue samples) to establish compatibility between donor and recipient.
"Technicians crossmatched six units overnight ahead of tomorrow's operation."
Regular inflection: crossmatches, crossmatched, crossmatching.
Standard plural, used mainly when referring to multiple test results or procedures.
"All crossmatches from the night shift were reviewed at morning handover."
Before any blood transfusion, a crossmatch literally mixes patient and donor samples in a tube — if they clump together, that blood cannot be given.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of crossmatch
Crossmatch is a twentieth-century compound formed within English medical terminology from 'cross' (in its sense of reciprocal or opposing combination, as in cross-examination) and 'match' (a pairing or contest). It arose as blood transfusion became routinely safe after the discovery of blood groups and anticoagulants in the early twentieth century, when laboratories needed a term for testing donor and recipient samples directly against each other. Its roots are therefore English and Germanic: 'cross' traces to Old Norse 'kross' via Latin 'crux', and 'match' to Old English 'gemæcca', meaning mate or equal.
Related word forms
How crossmatch is actually used
Crossmatch is chiefly a technical term used in transfusion medicine and transplantation, written solid (one word) in modern medical usage, though 'cross-match' also appears. It functions as both noun and verb, with standard inflections (crossmatched, crossmatching). It is formal/clinical rather than everyday vocabulary.
Easily confused with crossmatch
A cross-check verifies information against another source, whereas a crossmatch specifically tests biological compatibility of blood or tissue between individuals.
A mismatch is an incompatible pairing, while a crossmatch is the test used to detect such incompatibility.