If your doctor suggests a vitamin D assessment would be best for you, then a blood test will be performed at the end of winter/beginning of spring, when levels are at their lowest.
What are Adequate Vitamin D Levels?
When testing for vitamin D, adequate levels of vitamin D are considered to be >50nmol/L.2
Vitamin D deficiency can be determined using the 25-hydroxyvitamin D radioimmunoassay. While there is debate as to what vitamin D levels constitutes deficiency, the following is commonly used to guide a clinical approach3:
- Mild deficiency: 30-49nmol/L
- Moderate deficiency: 12.5-29nmol/L
- Severe deficiency: <12.5nmol/L