From:  Osteoporosis: definition, diagnosis, and considerations prior to starting treatment

 Classification of vitamin D status [88, 89, 94].

Status25OHD (ng/mL)25OHD (nmol/L)
Toxicity/Upper limit≥ 100≥ 250
Sufficiency≥ 30≥ 75
Insufficiency21–2952.5–72.5
Deficiency≤ 20≤ 50