The 25-hydroxy vitamin D test is the most accurate way to measure how much vitamin D is in your body. Vitamin D helps control calcium and phosphate levels in the body.
Doctor may request a 25-hydroxy vitamin D test for several different reasons. It can help them figure out whether too much or too little vitamin D is causing bone weakness or other abnormalities.
The results can indicate the following:
deficiency: less than 30 nmol/L (12 ng/mL)
potential deficiency: between 30 nmol/L (12 ng/mL) and 50 nmol/L (20 ng/mL)
normal levels: between 50 nmol/L (20 ng/mL) and 125 nmol/L (50 ng/mL)
high levels: higher than 125 nmol/L (50 ng/mL)
