@kdfrawg O_O really? usually here we screen people if they are at risk of vit d deficiency or osteoporosis. Actually this AAFP (american!) article is quite readable and gives a good list of the people who should be screened http://www.aafp.org/afp/2013/0415/od1.html
(I wonder what the current evidence base is for vit d and depression; i know there is some but how strong i'm not sure)
// @matigo @hazardwarning @ukhaiku @jpa