Objective To investigate the levels of 25-hydroxyvitamin D(25-OHD)in 0-6years old children in Chengdu and to provide scientific basis for the diagnosis of vitamin D deficiency rickets.Methods Serum levels of25-OHD in 2 162cases of children,who received the conventional health examination in the department of Child Care from September.2011to August.2012,were detected by chemiluminescence immunoassay(CIA).Results The mean values of serum 25-OHD was(30.57±13.50)ng/mL.Among 2 162children,909(42.0%)were relative...