# Vitamin D: Your store of the vitamin bones need

> Vitamin D helps you absorb calcium for your bones. Check your result, see what’s enough and what’s too much, and whether you need the test at all.

- Also called 25-hydroxy vitamin D, 25(OH)D and Calcidiol
- Not on a standard checkup
- No fasting needed
- Web page: https://picardo.health/guides/biomarkers/vitamin-d

## The short answer

Vitamin D helps you absorb the calcium your bones need. For most people, a level of 20 ng/mL or higher is enough.[2][3]

- **A good result:** 20 to 50 ng/mL. Twenty covers the needs of almost everyone, and going above 50 has no proven benefit.[2][3]
- **If yours is low:** Under 12 goes with deficiency, which can soften your bones over time. From 12 to 20 is lower than ideal. Both are usually treated with a daily vitamin D3 supplement.[3][8]
- **Should you test?** Most healthy adults don’t need it on its own. The Endocrine Society suggests against routine testing and sets no target, and US screening experts found too little evidence that it helps.[1][4] It’s worth checking if you have thin bones or a condition that affects absorption.[1][8] Many broader panels add it, because it costs little on a draw you’re already having.

## What is a normal vitamin D level?

Labcorp flags results under 20 ng/mL or over 100.[9] Until September 2026 it flagged anything under 30, but the 2024 Endocrine Society guideline no longer backs 30 as a target, or any target at all.[1][9] These are the cutoffs from US nutrition standards:[2][3]

Do you have osteoporosis?

### No

| Result (ng/mL) | What it means |
| --- | --- |
| Under 12.0 | Deficient: worth treating |
| 12.0 to 19.9 | Lower than ideal |
| 20.0 to 49.9 | Enough |
| 50.0 to 100.0 | More than you need |
| 100.1 to 149.9 | High: cut back |
| 150.0 or more | Very high: see a clinician soon |

### Yes, or I’m treated for thin bones (target: 30 to 50 ng/mL)

| Result (ng/mL) | What it means |
| --- | --- |
| Under 12.0 | Deficient: worth treating |
| 12.0 to 19.9 | Lower than ideal |
| 20.0 to 29.9 | Enough for most people, but below the target for osteoporosis |
| 30.0 to 49.9 | Enough |
| 50.0 to 100.0 | More than you need |
| 100.1 to 149.9 | High: cut back |
| 150.0 or more | Very high: see a clinician soon |

Osteoporosis guidelines aim higher, at 30 to 50 ng/mL, for people with thin bones.[8] For everyone else, 20 is enough.[2]

### Deficient: worth treating

**Range:** Under 12 ng/mL.

Levels below 12 go with vitamin D deficiency, which can soften your bones over time, a condition called osteomalacia.[3]

**How worried to be:** Very treatable. See a clinician in the next few weeks.

**What to do next:**

1. Ask a clinician about treatment and the right dose for you.
2. Find out why. Common reasons are little sun, darker skin, some medicines and conditions that affect absorption, such as celiac disease.[3][9]
3. Check your calcium and kidney function, which a metabolic panel includes.

[Test calcium and kidney function, $4.00](https://app.picardo.health/labs/order?tests=322000&ref=guide-vitamin-d)

### Lower than ideal

**Range:** 12 to 19.9 ng/mL.

Between 12 and 20, vitamin D is generally considered too low for bone health, and Labcorp flags it.[3][9] US nutrition standards call this inadequate rather than deficient, and it’s usually easy to raise.[3]

**How worried to be:** Not urgent.

**What to do next:**

1. A daily vitamin D3 supplement is the usual fix. D3 raises levels more than D2.[3]
2. The US daily allowance is 600 IU, or 800 IU over 70. Don’t take more than 4,000 IU a day unless a clinician advises it.[2]
3. Recheck after a few months, not weeks. The level changes slowly, with a half-life of about 15 days.[3]

### Enough for most people, but below the target for osteoporosis

**Range:** 20 to 29.9 ng/mL, if you have osteoporosis.

This is enough for most people.[2] But for people with osteoporosis, US endocrinologists recommend keeping vitamin D at 30 or higher.[8]

**How worried to be:** Not urgent. Worth raising at your next appointment.

**What to do next:**

1. Ask your clinician about your dose. Their guideline says 1,000 to 2,000 IU of D3 a day is typically needed to stay at 30 or above.[8]
2. Recheck after a few months. The level changes slowly.[3]

### Enough

**Range:** 20 to 49.9 ng/mL; 30 to 49.9 if you have osteoporosis.

This covers the needs of at least 97.5% of people, according to the US National Academies.[2] In large trials of mostly healthy adults, taking more vitamin D didn’t prevent cancer, heart disease or fractures.[5][6]

**How worried to be:** Nothing to worry about.

**What to do next:**

1. If you don’t have osteoporosis, there’s no need to retest routinely.[1]
2. If you take a supplement, keep to 4,000 IU a day or less unless a clinician advises more.[2]

### More than you need

**Range:** 50 to 100 ng/mL.

Labcorp won’t flag this.[9] But there’s no proven benefit to being this high, and the US National Academies recommend avoiding levels above about 50 to 60: they’ve been linked to possible harm.[2][3]

**How worried to be:** Not urgent. Toxic effects usually start far higher, above 150, but there’s no reason to go higher.[3]

**What to do next:**

1. If you take more than 4,000 IU a day, ask whether to cut back.[2]
2. If you’re 50 or older, daily doses are preferred to large weekly or monthly ones.[1]

### High: cut back

**Range:** Over 100 to 149.9 ng/mL.

This is above Labcorp’s range.[9] It’s nearly always from supplements, not sun or food.[3] It isn’t usually toxic yet, but it’s more than anyone needs.[3]

**How worried to be:** Not an emergency, but worth acting on now.

**What to do next:**

1. Stop or cut back on vitamin D, and check every product you take, including multivitamins and calcium.
2. Check your calcium. Too much vitamin D can push it up.[3]

[Test calcium and kidney function, $4.00](https://app.picardo.health/labs/order?tests=322000&ref=guide-vitamin-d)

### Very high: see a clinician soon

**Range:** 150 ng/mL or higher.

Vitamin D toxicity usually shows at levels above 150. It raises your calcium, which can cause nausea, vomiting, weakness, confusion, thirst and kidney stones.[3]

**How worried to be:** See a clinician in the next few days, and the same day if you have any of those symptoms.

**What to do next:**

1. Stop all vitamin D supplements now.
2. Have your calcium and kidney function checked. Too much vitamin D raises calcium, and in extreme cases damages the kidneys.[3]

[Test calcium and kidney function, $4.00](https://app.picardo.health/labs/order?tests=322000&ref=guide-vitamin-d)

## What is vitamin D?

> Think of this test as a gauge on a tank that fills and drains slowly. It reads your stored vitamin D, which changes over weeks and months, not from one day to the next.

Your skin makes vitamin D in sunlight, and a few foods contain it. Your liver turns it into 25-hydroxy vitamin D, the form this test measures, which reflects your supply from both.[3]

Its main job is helping your gut absorb calcium. Without enough, bones can become thin, brittle or misshapen.[3]

## Why don’t guidelines recommend routine vitamin D tests?

Because no one has shown that testing healthy people, and treating their numbers, makes them healthier. The US Preventive Services Task Force found too little evidence to recommend screening adults without symptoms.[4]

The 2024 Endocrine Society guideline goes further. It suggests against routine testing in healthy adults, including people with darker skin or obesity, and in pregnancy.[1] It also dropped the old target of 30 ng/mL, because trials haven’t identified a level that predicts benefit.[1]

## Do vitamin D supplements prevent disease?

In large trials of mostly healthy adults, they didn’t prevent cancer, heart disease or fractures. A newer trial in people who’d had a heart attack missed its main goal too:

| Trial | Who took part | What it found |
| --- | --- | --- |
| VITAL (2019) | 25,871 US men 50 and over and women 55 and over, taking 2,000 IU a day for about 5 years | No fewer cancers, heart attacks or strokes than a placebo[5] |
| VITAL fractures (2022) | The same trial | No fewer fractures, whatever people’s vitamin D level at the start[6] |
| TARGET-D (2026) | 630 people after a heart attack, dosed to reach 40 to 80 ng/mL | No significant drop in major heart events, its main goal. Fewer repeat heart attacks, a secondary finding that needs confirming.[7] |

The Endocrine Society does suggest a supplement, without testing first, for a few groups where trials point to modest benefits: adults 75 and older, pregnant people and people with prediabetes at high risk of diabetes.[1]

## What causes low vitamin D?

- Little sun, especially in winter or at northern latitudes[3][9]
- Darker skin, which makes less vitamin D from the same sun. Whether lower levels harm people with darker skin isn’t clear.[3]
- Older age, and obesity[3]
- Conditions that limit absorption, such as celiac disease, Crohn’s disease or gastric bypass surgery[3]
- Some medicines, including the seizure medicines phenytoin and phenobarbital, the antibiotic rifampin and steroids[3][9]

## How to raise vitamin D

- **A daily vitamin D3 supplement:** The most reliable way to raise your level. D3 works better than D2.[3] Over 50, daily doses are preferred to large weekly or monthly ones.[1] How much it helps: a lot. How sure we are: very sure.
- **Sunlight:** Your skin makes vitamin D in the sun, but how much varies with the season, the time of day and your skin color.[3] Sun also raises your risk of skin cancer.[3] How much it helps: some. How sure we are: fairly sure.
- **Food:** Oily fish, egg yolks and fortified milk and cereals contain some, but few foods contain much.[3] How much it helps: a little. How sure we are: very sure.

The US daily allowance is 600 IU, or 800 IU over 70, and the upper limit for adults is 4,000 IU a day.[2] Higher treatment doses are for a clinician to set.

## Who should get a vitamin D test?

Guidelines don’t support routine testing in healthy adults, whatever their age, skin color or weight.[1][4] It’s worth checking if:

- You have osteoporosis or have broken a bone in a minor fall.[8]
- You have a condition that affects absorption, such as celiac disease, inflammatory bowel disease or weight-loss surgery.[1][3]
- You have kidney or liver disease.[1][9]
- You take a medicine that speeds up vitamin D breakdown, such as phenytoin, phenobarbital or rifampin.[9]
- You take more than the upper limit of 4,000 IU a day.[2][3]

Vitamin D also comes in many broader panels, such as checkups and tests for tiredness or after birth, because it costs little to add to a draw that’s already happening. If yours comes back low, that’s common: almost 1 in 4 people in the US have a level that’s low or borderline.[3] So a low result won’t by itself explain symptoms such as tiredness. A daily vitamin D3 supplement is the usual fix.[3]

## How to get a vitamin D test, and what it costs

A vitamin D test costs $11.00 through Picardo.

- [Vitamin D on its own, $11.00](https://app.picardo.health/labs/order?tests=081950&ref=guide-vitamin-d). Labcorp 081950, no fasting needed.

Every order comes with:

- Results in 2 to 3 days, in the app
- Physician follow-up if you want one
- Free Labcorp draw, or $75 at home
- No other fees. HSA and FSA eligible.

It’s also part of the [Base Core Annual – Men](https://picardo.health/labs/panels/base-core-men), [Base Core Annual – Women](https://picardo.health/labs/panels/base-core-women), [Heart Health](https://picardo.health/labs/panels/heart-health), [Brain Health Screening](https://picardo.health/labs/panels/brain-health), [Postpartum](https://picardo.health/labs/panels/postpartum), [Fertility](https://picardo.health/labs/panels/fertility) and [Celiac / GI](https://picardo.health/labs/panels/celiac-gi) panels, if you’d rather test more at once.

Already have a result? [Ask Picardo about it](https://app.picardo.health/auth).

## Questions people ask

### Is a vitamin D level of 25 low?

Not for most people. The US National Academies say 20 ng/mL covers the needs of 97.5% of people, and Labcorp’s range now starts at 20.[2][9] If you have osteoporosis, US endocrinologists aim for 30 or higher.[8]

### How much vitamin D should I take?

For most adults, the US daily allowance is 600 IU, or 800 IU over 70. It assumes you get little sun.[2] The Endocrine Society suggests more, without testing first, for adults 75 and older, in pregnancy and, alongside lifestyle changes, for prediabetes with a high risk of diabetes. Trial doses in those groups averaged about 900, 2,500 and 3,500 IU a day.[1]

### Can you take too much vitamin D?

Yes. The upper limit for adults is 4,000 IU a day.[2] Toxicity is rare and almost always comes from supplements, with levels usually above 150 ng/mL. It raises calcium, which can harm your kidneys.[3]

### Is vitamin D3 better than D2?

Yes. D3 raises your level more, and keeps it up for longer.[3]

### How long does it take to raise vitamin D?

Months rather than weeks. The form the test measures has a half-life of about 15 days, so a new dose takes a few months to settle.[3]

## Often checked alongside

- [Calcium](https://picardo.health/guides/biomarkers/calcium.md): Calcium in your blood, set by the parathyroid glands
- [Magnesium](https://picardo.health/guides/biomarkers/magnesium.md): A mineral for muscles, nerves and heart rhythm
- [Vitamin B12](https://picardo.health/guides/biomarkers/vitamin-b12.md): Needed for nerves and red blood cells
- [Ferritin](https://picardo.health/guides/biomarkers/ferritin.md): How much iron you have in store

## Test details

- **Labcorp test:** Vitamin D, 25-Hydroxy, 081950
- **LOINC:** 62292-8
- **Sample:** Blood
- **Fasting:** Not needed
- **Typical lab range:** 20.0 to 100.0 ng/mL[9]
- **Measures:** Total 25-hydroxy vitamin D, from D2 and D3[9]
- **Units:** ng/mL in the US. For nmol/L, multiply by 2.5.

## Sources

1. Demay MB, Pittas AG, Bikle DD, et al. Vitamin D for the prevention of disease: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2024;109(8):1907–1947. https://doi.org/10.1210/clinem/dgae290
2. Ross AC, Manson JE, Abrams SA, et al. The 2011 report on dietary reference intakes for calcium and vitamin D from the Institute of Medicine: what clinicians need to know. J Clin Endocrinol Metab. 2011;96(1):53–58. https://doi.org/10.1210/jc.2010-2704
3. Office of Dietary Supplements, National Institutes of Health. Vitamin D: fact sheet for health professionals. Updated June 27, 2025. https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/
4. US Preventive Services Task Force; Krist AH, Davidson KW, Mangione CM, et al. Screening for vitamin D deficiency in adults: US Preventive Services Task Force recommendation statement. JAMA. 2021;325(14):1436–1442. https://doi.org/10.1001/jama.2021.3069
5. Manson JE, Cook NR, Lee IM, et al. Vitamin D supplements and prevention of cancer and cardiovascular disease. N Engl J Med. 2019;380(1):33–44. https://doi.org/10.1056/NEJMoa1809944
6. LeBoff MS, Chou SH, Ratliff KA, et al. Supplemental vitamin D and incident fractures in midlife and older adults. N Engl J Med. 2022;387(4):299–309. https://doi.org/10.1056/NEJMoa2202106
7. May HT, Le VT, Anderson JL, et al. Targeted vitamin D supplementation and major adverse cardiovascular events after myocardial infarction: the TARGET-D trial. Eur Heart J. Published online September 7, 2026. https://doi.org/10.1093/eurheartj/ehag611
8. Camacho PM, Petak SM, Binkley N, et al. American Association of Clinical Endocrinologists/American College of Endocrinology clinical practice guidelines for the diagnosis and treatment of postmenopausal osteoporosis—2020 update. Endocr Pract. 2020;26(Suppl 1):1–46. https://doi.org/10.4158/GL-2020-0524SUPPL
9. Labcorp. Vitamin D, 25-hydroxy, test 081950. Labcorp test menu. Updated September 15, 2026. Accessed October 28, 2026. https://www.labcorp.com/tests/081950/vitamin-d-25-hydroxy

Updated 2026-11-03. This is general health information, not medical advice: talk to your clinician about your results and before changing any treatment.