SEASONAL VARIATIONS IN SERUM CONCENTRATIONS OF 25 HYDROXYVITAMIN D AND PARATHYROID HORMONE IN NORMAL SUBJECTS IN BEIJING / 中华内分泌代谢杂志

ABSTRACT

Serum concentrations of 25-OHD and PTH were determined in 71 normal subjects in Beijing both in December 1983 and in July 1984 using the methods of CPBA and RIA respectively. The results showed that the mean values of 25-OHD were 13.2?3.8 and 18.9?6.5ng/ml (M?SD, P