In which situation would you use lavage?

Lavage refers to the process of flushing out an organ or cavity with a liquid, often used in medical settings. In the context of this question, using lavage to clean out the stomach during poisoning is correct because it is a common procedure employed to remove toxic substances or drugs that have been ingested. This can help prevent the poison from being further absorbed into the bloodstream, thereby reducing its harmful effects on the body. By cleansing the stomach, healthcare providers can provide a more effective intervention in cases of acute poisoning.

While the other options involve important medical procedures, they do not pertain to the specific use of lavage. Treating parasitic infections typically requires different therapeutic approaches, such as medication specific to the type of infection. Assessing blood flow generally involves imaging techniques or specialized tests that measure circulation rather than a flushing technique like lavage. Lastly, delivering medication intravenously involves injecting substances directly into the bloodstream rather than using a washing process. Understanding the specific context and application of lavage emphasizes its role in emergency medicine, especially in cases of poisoning.