Final answer:
Factors that may increase the likelihood of a positive Gastroccult test result include taking iron preparations, consuming red meat, and being on a long-term NSAID regimen. Consuming carbohydrates or experiencing nausea are not typically associated with an altered test result.
Step-by-step explanation:
The likelihood of a positive Gastroccult test, which is a test used to detect the presence of blood in the stool, can be influenced by various factors. A) Taking an iron preparation might cause a false-positive result because iron can turn the test developer blue, a color change that also indicates a positive test for blood. B) Consuming red meat can lead to a positive result as well; components from red meat can mimic blood during the test. C) Being on a long-term nonsteroidal anti-inflammatory drug (NSAID) regimen may also increase the likelihood of a positive result, as these medications can cause gastrointestinal bleeding, which the test is designed to detect. Consuming carbohydrates (D) or experiencing nausea (E) does not typically affect the outcome of a Gastroccult test. Factors that favor iron absorption, such as alcohol ingestion, and those that impair it, such as achlorhydria and copper deficiency, are unrelated to the Gastroccult test's ability to detect blood in stool.