urinary free catecholamines

urinary free catecholamines

The free/nonbound and nonmetabolized catecholamines, epinephrine and norepinephrine, excreted in urine in 24 hrs which, normally, is 2-4% of the total catecholamine production Ref range < 600 nmol/24 hrs–US: 100 µg/24 hrs, of which 473 nmol/24 hrs–US: 80 µg/24 hrs is norepinephrine, and 109 nmol/24 hrs–US: 20 µg/24 hrs is epinephrine. Cf Total catecholamine test.
References in periodicals archive ?
Parkinson's disease: The effect of L-dopa therapy on urinary free catecholamines and metabolites.
The usual methods are measurement of urinary free catecholamines and its metabolites VMA and MNs in a 24-hour urine sample.
Of the 95 patients with MAD or NMT over the upper reference limit, 30 patients had no further follow-up because negative results were obtained for repeat testing of either urinary fractionated metanephrines or urinary free catecholamines.
The measurement of plasma MN and NMN has been shown to be more clinically sensitive than urinary free catecholamines and metanephrines for the detection of pheochromocytoma (8-11).
Recently, the measurement of plasma free metanephrine and free normetanephrine has been advocated as being more clinically sensitive than urinary free catecholamines and metanephrines (tM plus tNM together) (6).
The aim of this study was to determine whether drugs commonly prescribed to subjects with symptoms of pheochromocytoma interfere with the measurement of urinary free catecholamines and total metanephrines by these new immunoassays.
An automated method for the analysis of urinary free catecholamines using ASTED and highpertormance liquid chromatography.
The automation of such techniques using automated sequential trace enrichment of dialysates (ASTED) [3] has been applied successfully to the assay of urinary free catecholamines (2).
In the present experiments, urinary free catecholamines were assayed using a modification of a method described previously (7).