guaiac test

(redirected from Almen test for blood)


a resin from certain Caribbean trees, used as a reagent.
guaiac test one for occult blood; glacial acetic acid and guaiac are mixed with the specimen; on addition of hydrogen peroxide, the presence of blood is indicated by a blue tint.

guai·ac test

an obsolete test using glacial acetic acid, gum guaiac solution or hydrogen peroxide to detect traces of fecal or occult blood.

guai·ac test

(gwī'ak test)
A screening procedure for occult blood in stool.


August Teodor, Swedish physiologist, 1833-1903.
Almén test for blood - a test for occult blood. Synonym(s): guaiac test; Schönbein test; van Deen test