Vitamin D
Stomach and gut healthVitamin D is a fat-soluble vitamin that acts like a hormone in the body.
It's essential for calcium absorption, bone health, immune function, and muscle performance. The body can produce it through sunlight exposure, but it can also be obtained from food and supplements.
Reference range
Source: Ahead Health benchmark
Reference ranges may vary between labs and assays. Always interpret results with your healthcare provider.
Why this matters
Low vitamin D can lead to weakened bones (osteopenia or osteoporosis), muscle weakness, and increased risk of falls. It may also affect immune function and mood. Maintaining adequate vitamin D levels through sunlight, diet, and supplementation when needed supports bone strength, muscle function, and overall health.
How this connects to other biomarkers
- Low Vitamin D with low Calcium and elevated Alkaline Phosphatase suggests soft, weakened bones (osteomalacia) or a compensating overactive parathyroid (secondary hyperparathyroidism).
- Vitamin D is needed to absorb calcium from the gut - persistently low Albumin-corrected Calcium despite oral calcium supplementation should prompt vitamin D testing.
- In chronic kidney disease (low estimated Glomerular Filtration Rate (eGFR)), the kidneys can no longer activate vitamin D properly, so 25-OH levels often drop.
Included in
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