C. VELENTZAS, M.D.; D. G. OREOPOULOS, M.D., PH.D.; L. BRANDES, B.SC.; D. R. WILSON, M.D.; A. MARQUEZ-JULIO, M.D.
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The introduction of Haddad and Chyu's method (1) for the measurement of plasma 25-(OH) vitamin D has highly facilitated the study of vitamin-D metabolism. It has been found that low levels of 25-(OH) vitamin D are present in patients receiving anticonvulsants (2), in patients with derangement of the excretory function of the liver (1), and in patients with vitamin-D deficiency (3). Recently, low levels of plasma 25-(OH) vitamin D have been reported in patients with nephrotic syndrome (4). In contrast, high levels have been observed in persons with heavy exposure to sunlight (1); this causes a seasonal variation of plasma
VELENTZAS C, OREOPOULOS DG, BRANDES L, et al. Abnormal Vitamin-D Levels. Ann Intern Med. 1977;86:198. doi: 10.7326/0003-4819-86-2-198
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Published: Ann Intern Med. 1977;86(2):198.
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