Explain the principle of the Guaiac Test for occult blood and the reasons that guaiac is the reagent of choice.

1. Explain the principle of the Guaiac Test for occult blood and the reasons that guaiac is the reagent of choice.

2.    Write the instructions that must be given to patients as regards the collection of stool specimen for occult blood test, including the dietary restrictions.

3. What is the most sensitive and specific method for the detection of occult blood?

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