Eastwood J B, de Wardener H E, Gray R W, Lemann J L
Lancet. 1979 Jun 30;1(8131):1377-8. doi: 10.1016/s0140-6736(79)92012-9.
Three patients with advanced untreated nutritional osteomalacia had low plasma concentrations of 25-OHD and 24, 25-(OH)2D, and a raised concentration of immuno-assayable parathyroid hormone. The plasma concentration of 1, 25-(OH)2D was normal in all 3 patients.