Measures catecholamines (such as adrenaline, noradrenaline, and dopamine) in urine collected over time. HPLC is a lab method used to separate and quantify these stress‑related hormones.
Used to investigate suspected catecholamine‑secreting tumours (pheochromocytoma or paraganglioma) when symptoms include episodic headaches, sweating, palpitations, and high blood pressure.