Table 1.

Classification of vitamin D status for skeletal health

For the ranges below, vitamin D status is measured in terms of 25(OH)D serum concentration
Most common thresholdsa
Deficiency: <50 nmol/l (20 ng/ml)
Insufficiency: 51–74 nmol/l (21–29 ng/ml)
Sufficiency: >75 nmol/l (>30 ng/ml)
Most conservative thresholdsb
Deficiency: <25 nmol/l (<10 ng/ml)
Insufficiency: 25–50 nmol/l (10–20 ng/ml)
Sufficiency: >50 nmol/l (>20 ng/ml)

^aHolick & Chen (2008); US Institute of Medicine: Ross et al. (2011).

^bInternational Osteoporosis Foundation: Dawson-Hughes et al. (2010).