Final answer:
The first test to check for hyperemesis gravidarum is often a urinalysis, which is used to assess dehydration and nutritional intake. Blood tests are also common to check for electrolyte imbalances and other conditions.
Step-by-step explanation:
The subject of the question relates to the diagnosis of hyperemesis gravidarum, a condition characterized by severe nausea and vomiting in pregnant individuals. When evaluating a person for hyperemesis gravidarum, the first test that is often performed is a urinalysis. This can help to assess for dehydration and the presence of ketones which may indicate poor nutritional intake due to excessive vomiting. A blood test may also be conducted to check for electrolyte imbalances, liver and thyroid function, and to evaluate for other potential causes of nausea and vomiting.