What does citrated mean?
Citrated is a technical adjective used chiefly in medicine and laboratory science to describe a substance — most often blood or plasma — that has been treated with a citrate, typically sodium citrate. Citrate works by binding free calcium ions, which are essential to the clotting cascade; removing them in this way prevents the sample from coagulating. This makes citrated blood the standard form in which donated blood is collected and stored, since it must remain liquid from donor to recipient. Beyond transfusion medicine, the word can appear in chemistry to describe any compound or solution containing a citrate group. Because of its narrow domain, citrated carries a distinctly clinical register: readers will meet it in hospital protocols, research papers, and blood-bank documentation rather than everyday prose. It derives ultimately from citrus, via citric acid and its salts.
adjectiveCombined or treated with a citrate, especially a salt of citric acid; in medicine and laboratory work, describing blood or solutions that have been mixed with sodium citrate to prevent clotting.
- (Of blood, plasma, or other biological fluids) treated with a citrate salt such as sodium citrate to prevent coagulation by binding calcium ions.
- (More generally, in chemistry) combined with or containing a citrate.
"The blood bank stored the citrated plasma at four degrees Celsius until it was needed for transfusion."
"The transfusion relied on citrated blood collected earlier that morning."
"The chemist prepared a citrated buffer to keep the calcium ions in solution."
Every bag of donated blood that saves a life is almost certainly citrated — without citrate salts to tie up calcium, it would clot long before reaching the patient.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of citrated
Citrated is formed from the noun citrate — a salt or ester of citric acid — combined with the participial suffix -ed, indicating treatment or combination with that substance. Citric acid takes its name from citrus fruits, whose Latin name citrus gave English both citrus and citron. The chemical vocabulary around citrates developed in the late eighteenth and nineteenth centuries as organic chemistry established the identities of fruit acids and their salts.
How citrated is actually used
A technical term confined largely to haematology, transfusion medicine, and clinical chemistry; it is rarely encountered outside medical and laboratory contexts and would be considered jargon in general writing.
Easily confused with citrated
Citrine is a yellow quartz gemstone (or the colour yellow), whereas citrated means combined or treated with a citrate salt.