Clinical Research
Establishment a diagnostic strategy of pheochromocytoma by plasma free metanephrines determined by liquid chromatography-tandem mass spectrometry
Fei Huang, Fangjun Chen, Yingfei Peng, Jiong Wu, Wei Guo
Published 2017-11-08
Cite as Chin J Exp Surg, 2017, 34(11): 1982-1984. DOI: 10.3760/cma.j.issn.1001-9030.2017.11.053
Abstract
ObjectiveTo set up reference intervals of plasma free metanephrine (MN) and normetanephrine (NMN) by liquid chromatography-tandem mass spectrometry (LC-MS/MS) and diagnostic strategies of pheochromocytoma.
Methods255 healthy people were recruited to set up reference intervals.110 patients with pheochromocytoma were also enrolled, in addition to 1 262 subjects taken as disease control group and 500 subjects taken as health control group. Positive rates of plasma free MN and NMN were compared among different groups. Diagnostic strategies were designed according to reference intervals and cut-off value with optimal specificity determined by receiver operating characteristic (ROC) curve.
ResultsThe reference intervals of MN and NMN are <64.97 pg/ml and <185.83 pg/ml, respectively. Significant differences in the level of MN and NMN were found between not only pheochromocytoma group and disease control group (Z=-17.410, P=0.000; Z=-17.278, P=0.000), but also pheochromocytoma group and health control group (Z=-16.434, P=0.000; Z=-16.439, P=0.000). We establish diagnostic strategy A for either of MN and NMN above the upper limit of the reference range and B for either of MN and NMN above specific diagnostic cutoff value to rule in or rule out the diagnosis of pheochromocytoma.
ConclusionThe reference intervals of plasma free MN and NMN by LC-MS/MS and diagnostic strategies of pheochromocytoma.
Key words:
Liquid chromatography-tandem mass spectrometry; Metanephrine; Normetanephrine; Pheochromocytoma
Contributor Information
Fei Huang
Department of Clinical Laboratory Medicine, Zhongshan Hospital, Fudan University, Shanghai 200032, China
Fangjun Chen
Yingfei Peng
Jiong Wu
Wei Guo