When preparing for a guaiac test, what should the nurse tell the client the test will detect?

The guaiac test is designed to detect the presence of hidden (occult) blood in the stool. This test is often used as a preliminary screening tool for various gastrointestinal conditions, such as colorectal cancer or gastrointestinal bleeding. When blood is present in the digestive tract, it may not be visibly noticeable in the stool, making this test an essential diagnostic tool for identifying underlying issues that require further investigation.

In this context, the focus on blood detection is crucial, as it helps in assessing the health of the gastrointestinal system and prompts further diagnostic procedures if needed. The other options presented do not pertain to the purpose of a guaiac test, as it specifically targets blood rather than glucose levels, fat content, or bacterial infections.