phenolphthalein test

phenolphthalein test
(for blood) boil a thin fecal suspension, cool, and add it to half as much reagent (made by dissolving 1 to 2 g of phenolphthalein and 25 g of potassium hydroxide in water). Add 10 g of metallic zinc and heat until decolorized. A pink color indicates the presence of blood.

Medical dictionary. 2011.

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