Definition
What Vitamin D measures
25-hydroxy vitamin D is the storage form used to judge vitamin D status. It reflects sun exposure, intake, absorption, and season more than a single day’s weather.
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Nutrient statusEssentialCompleteng/mL
Vitamin D
The hormone-like nutrient from sun, food, and stores
Illustrative sample band · Synthetic
38ng/mL
24Sample target 40–80 ng/mL106
Why it matters
How clinicians usually read it
It sits at the intersection of bone, muscle, immune, and endocrine conversations. The laboratory report and a clinician set the target; this page does not.
When it reads low
A lower value can mean
A lower value is common in winter, with limited sun, darker skin, or malabsorption. It is a status marker, not a diagnosis of bone disease.
When it reads high
A higher value can mean
A higher value usually reflects supplementation. Very high levels are uncommon from sun alone and should be reviewed before more is added.
Questions for a clinician
Bring the number into a real conversation
01
What target do you use for my age, season, and medical history?
02
Should this be repeated after a season change or a supplement change?
03
Do my calcium, PTH, or bone history change how you read this?
Educational boundary
Educational information only. Displayed ranges are illustrative sample bands, not a diagnosis, treatment plan, or substitute for the contracted laboratory report and a qualified clinician.
See it as a sample result
The sample dashboard shows an illustrative reading, target band, and trend for Vitamin D.