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Clinical Chemistry 32: 1879-1883, 1986;
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Clinical Chemistry, Vol 32, 1879-1883, Copyright © 1986 by American Association for Clinical Chemistry

Radioimmunoassay of metanephrine and normetanephrine for diagnosis of pheochromocytoma

K Iinuma, I Ikeda, T Ogihara, K Hashizume, K Kurata and Y Kumahara

Sensitive and specific radioimmunoassays of metanephrine and normetanephrine were developed by use of 125I-labeled synephrine and specific metanephrine antibody, and 125I-labeled octopamine and specific normetanephrine antibody. Specific antibody for both metanephrine and normetanephrine was raised in rabbits by immunization with bovine serum albumin conjugated with the corresponding hapten, prepared by the method of Grota and Brown (Endocrinology 1976;98:615). The detection limits of the metanephrine and the normetanephrine radioimmunoassays were 2 and 6 pg/tube, respectively. Mean plasma metanephrine and normetanephrine values for 24 normal subjects were 62 (SD 14) and 100 (SD 40) ng/L, respectively. Mean urinary metanephrine and normetanephrine values for 22 normal subjects were 154 (SD 74) and 217 (SD 109) micrograms/day. For 14 pheochromocytoma patients, plasma metanephrine and normetanephrine values ranged from 29 to 683 and from 28 to 7850 ng/L, and urinary metanephrine and normetanephrine values were 606 to 6630 and 296 to 4800 micrograms/day, respectively. The present methods are simple and suitable for routine tests or for mass screening for pheochromocytoma.


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J. Wassell, P. Reed, J. Kane, and C. Weinkove
Freedom from Drug Interference in New Immunoassays for Urinary Catecholamines and Metanephrines
Clin. Chem., December 1, 1999; 45(12): 2216 - 2223.
[Abstract] [Full Text] [PDF]

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B. G. Wolthers, I. P. Kema, M. Volmer, R. Wesemann, J. Westermann, and B. Manz
Evaluation of urinary metanephrine and normetanephrine enzyme immunoassay (ELISA) kits by comparison with isotope dilution mass spectrometry
Clin. Chem., January 1, 1997; 43(1): 114 - 120.
[Abstract] [Full Text] [PDF]


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Copyright © 1986 by the American Association for Clinical Chemistry.