Recognize that prolactin levels are elevated due to causes other than prolactinoma.

Explanation

Many doctors who do not know this would look to get an MRI or CT of the head looking for a prolactinoma but this could easily mislead a workup.

Hypothyroidism is notorious for giving elevated prolactin levels. It is thus important to check the TSH in every case with hyperprolactinemia.

Drugs such as Phenothiazines can also do this because of their anti-dopaminergic effect. This makes it important to take a good drug (medication) history in patients with galactorrhea.