Diagnosis depends on identification of mutation of the RET gene. This can be done with a blood test.
Diagnostic tests are also used to evaluate the function of each endocrine gland.
A physical examination may reveal enlarged cervical lymph nodes. An examination of the thyroid may reveal a single or multiple thyroid nodules. Vital signs (temperature, pulse, rate of breathing, blood pressure) may reveal high blood pressure, which may be sustained or episodic, rapid heart rate and elevated temperature. In MEN IIb, mucosal neuromas (benign tumors of the mucosa) may be present, as well as puffy lips and a prominent jaw.
These tests help confirm the diagnosis:
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