> 50 nmol/L
Vitamin D levels >50 nmol/L at the end of winter are recommended. Level should be 10-20 nmol/L higher at the end of summer to allow for seasonal decrease.
Vitamin D levels < 50 nmol/L indicate deficiency. Levels <25 nmol/L indicate significant deficiency.
Sources: RCPA Position Statement May 2019, "Use and Interpretation of Vitamin D testing"
Nowson CA, McGrath JJ, Ebeling PR, et al. Vitamin D and health in adults in Australia and New Zealand: a position statement. Med J Aust 2012; 196: 686-7.
25 Hydroxy Vitamin D3 is the appropriate metabolite to asess in suspected deficiency states.
Occasionally 1,25 di-Hydroxy Vitamin D3 is indicated, but discussion with Chemical Pathologist is required prior to testing by an external provider.
Enquiries - Phone Core Laboratory Box Hill Hospital; 9895 3473