alexa Insulinoma with low circulating insulin levels: the diagnostic value of proinsulin measurements.
Diabetes & Endocrinology

Diabetes & Endocrinology

Journal of Diabetes & Metabolism

Author(s): Alsever RN, Roberts JP, Gerber JG, Mako ME, Rubenstein AH

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Abstract Hypoglycemia coexisting with very low plasma immunoreactive insulin concentrations was found in a 78-year-old woman with an insulinoma. However, the absolute proinsulin levels during hypoglycemia were elevated (0.9 to 1.4 ng/ml), accounting for 66.5\% of the total circulating immunoreactive insulinlike material. The raised serum proinsulin concentrations together with an abnormal proinsulin:insulin ratio proved to be of critical importance in establishing the diagnosis of an islet-cell tumor in this patient.
This article was published in Ann Intern Med and referenced in Journal of Diabetes & Metabolism

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