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.
an obsolete test using glacial acetic acid, gum guaiac solution or hydrogen peroxide to detect traces of fecal or occult blood.
Synonym(s): Almén test for blood
guai·ac test(gwī'ak test)
A screening procedure for occult blood in stool.