Table 4.

Diverse thresholds of serum vitamin D [25(OH)D] for the definition of sufficiency, insufficiency, or deficiency proposed by diverse scientific societies and international agencies.

25(OH)D ng/mL	NAM/NIH	ES	NOS	SACN	AGS *	ESE
<10	deficiency	deficiency	deficiency	deficiency	deficiency	deficiency
10–20	inadequacy risk	deficiency	inadequacy risk	sufficient	deficiency	deficiency
20–30	sufficiency	insufficiency	sufficiency	sufficient	deficiency risk	insufficiency
30–50	sufficiency	desirable concentration	sufficiency	sufficient	minimal acceptable concentration	sufficiency
50–100	possible excess adverse events	desirable concentration			possible onset of toxicity
100–150	possible excess adverse events				possible onset of toxicity
>150					toxicity

NAM: National Academy of Medicine (former Institute of Medicine, IOM), USA; NIH: National Institute of Health, USA; ES: Endocrine Society, USA; NOS: National Osteoporosis Society, UK; SACN: Scientific Advisory Committee on Nutrition, UK; American Geriatrics Society, USA; ESE: European Society of Endocrinology. * Values applicable to old age.