What is the test used to evaluate a patient’s ability to tolerate food or liquid by mouth without subsequent vomiting?

• A. PO challenge
• B. Oral tolerance test
• C. Gastrointestinal swallow study
• D. NPO challenge

Answer: (A)

The key idea is testing how well a patient can take in food or liquids by mouth after a period without oral intake. A PO challenge does exactly that: small amounts of oral intake are given and the patient is watched for vomiting or other trouble, to see if it's safe to resume feeding. If the patient tolerates the initial sips, the intake is gradually increased.

Other approaches focus on different goals. A gastrointestinal swallow study uses imaging to examine how the swallowing mechanism works and whether there’s a risk of aspiration, rather than simply whether vomiting occurs after oral intake. An oral tolerance test is typically used in contexts like food immunology or specific tolerance assessments and isn’t the standard method for determining general readiness to resume eating by mouth. An NPO challenge isn’t about resuming oral intake at all; NPO means nothing by mouth, so this would not evaluate tolerance to eating.