Catecholamines, Plasma

 This test measures the levels of catecholamines—primarily dopamine, norepinephrine, and epinephrine—in the bloodstream. These hormones are produced by the adrenal glands and are crucial in regulating stress response, heart rate, and blood pressure. It is typically ordered to diagnose conditions like pheochromocytoma or neuroblastoma.

 Patients with episodic symptoms such as severe hypertension, palpitations, headaches, excessive sweating, and anxiety may be advised to undergo this test. It is also used to evaluate adrenal gland tumors and in some cases, to monitor the progress or recurrence of certain cancers.

 The test requires a blood sample, usually drawn in a controlled setting. The patient may need to fast and avoid caffeine, nicotine, certain medications, and stress prior to testing, as these can influence catecholamine levels. Some medications may need to be temporarily discontinued under a doctor’s supervision.

 Elevated catecholamine levels may suggest the presence of a catecholamine-secreting tumor such as pheochromocytoma or paraganglioma. In children, high levels may be linked to neuroblastoma. Mild elevations can also occur due to stress, stimulant use, or certain medications. Low levels are generally not clinically concerning but may warrant investigation in specific contexts.

 Yes, it is frequently used to assess the success of surgical removal of tumors and to check for recurrence. A return to normal catecholamine levels post-treatment usually indicates a favorable outcome.