A nurse is reinforcing teaching with a client who is to take a fecal occult blood test at home. Which of the following instructions should the nurse include in the teaching?

A. Use the same part of stool for each sample: Samples should be collected from different areas of the stool because blood may not be uniformly distributed. Using the same area could lead to a false-negative result. B. Apply five drops of developer to each smear: The correct number of drops is specified in the test kit instructions, and five drops may be excessive or insufficient depending on the manufacturer. Following kit directions ensures accurate results. C. Ensure the sample contains no urine: Urine can interfere with the chemical reaction in the fecal occult blood test and cause false-positive or false-negative results. Keeping the stool free of urine is essential for accurate testing. D. Wait 10 min before applying the developing solution: The developer should be applied immediately after the stool sample is prepared according to the kit instructions. Waiting unnecessarily could affect the test’s sensitivity and lead to inaccurate results.