13 source-based articles maintained by the HealthRX.com Editorial Team.
Showing 13 of 13 clinical reviews.
A decade-by-decade clinical guide to interpreting 25-OH vitamin D lab results, including optimal ranges, deficiency thresholds, supplementation doses, and age-specific risks backed by primary evidence.
The lab reference range for 25-OH vitamin D starts at 20 ng/mL, but clinical guidelines and outcomes data suggest a functional optimal is 40 to 60 ng/mL. Learn what your number means, what drives deficiency, and how to correct it.
What serum 25-OH vitamin D level should you actually aim for? This HealthRX.com clinical guide covers standard lab ranges, longevity-medicine targets, deficiency thresholds, optimal dosing, and the latest trial evidence prepared by the HealthRX.com Editorial Team.
A clinical guide to how common medications raise or lower 25-OH vitamin D levels, including corticosteroids, anticonvulsants, GLP-1 agonists, and more. Includes optimal ranges, dosing guidance, and monitoring protocols.
A complete clinical guide to medications that raise, lower, or falsify 25-OH vitamin D results, plus normal ranges, deficiency thresholds, and how to interpret a distorted lab value.
strategies to raise or normalize your 25-hydroxyvitamin D, including supplementation doses, sun exposure guidelines, dietary sources, and when to retest.
Learn what the 25-hydroxyvitamin D blood test measures, how it reflects your vitamin D status, what normal ranges mean, and when your doctor should order it.
Your 25-OH vitamin D level directly shapes medication choices, dosing protocols, and clinical outcomes. Learn how specific ranges affect hormone therapy, GLP-1 treatment, bone health prescriptions, and more.
Learn when clinicians should order a 25-OH vitamin D test, what normal ranges mean, and how to interpret results for deficiency or excess.
A clinician-facing guide to the labs you should pair with a 25-hydroxyvitamin D test, including calcium, PTH, magnesium, phosphorus, and renal panels, with evidence-based rationale for each.
See vitamin D ranges by ng/mL: under 20 is deficient, 30-100 is sufficient, 40-60 is the preferred target for at-risk adults per Endocrine Society guidelines.
Finger-prick dried blood spot kits for 25-OH vitamin D correlate closely with venous draws. Deficiency is below 20 ng/mL; target range is 40 to 60 ng/mL.
Fasting is not required for a 25-OH vitamin D test; it changes results by less than 5%. See deficiency, insufficiency, and optimal ranges (40-60 ng/mL).