Catecholamines (derived from tyrosine residues) are classed as phenethylamines; of these, adrenaline, noradrenaline and dopamine are the most abundant. They are produced mainly from the adrenal medulla in addition to the post-ganglionic fibres of the sympathetic nervous system, and function as hormones in the vascular system and neurotransmitters in the central/peripheral nervous systems. Their role is one of bringing about physiological changes preparatory to physical activity, eg. increased heart rate/blood pressure and gluconeogenesis. Elevated catecholamine turnover is observed in incidences of phaeochromocytoma and childhood neuroblastoma.
Diagnosis of phaeochromocytoma/paraganglioma. Symptoms include: elevated heart rate, resistant arterial hypertension, palpitations, anxiety, diaphoresis, cardiomyopathy and headaches Differential diagnosis of phaeochromocytoma includes: anxiety disorders, carcinoid syndrome, essential hypertension, hyperthyroidism, renovascular hypertension, paroxysmal supraventricular tachycardia and insulinoma
|Reference ranges will be given with the report|
24 hour urine collection acidified
24 hour urine collection
Random urine samples are accepted where it is difficult to provide 24 hour collections. These must be acidified on receipt in the Laboratory specimen reception.