Discussion
One of the following is not the component of Kastle-Meyer Test
Answer: B
The item that is not a component of the Kastle-Meyer test is glacial acetic acid. The reagent is made from phenolphthalein (reduced to colourless phenolphthalin by zinc dust) in potassium hydroxide solution, and then hydrogen peroxide is added to the sample. A pink colour shows haemoglobin's peroxidase-like action.
Phenolphthalein, zinc dust and potassium hydroxide are all in the reagent. Glacial acetic acid is used in a different blood test, Teichmann's crystal test for haemin, so it is the odd one out.
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