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Vitamin D (25-OH)

Vitamin D Blood Test

Q: How much sunlight do I need for vitamin D?

Around 15–20 minutes of midday sun exposure on face and arms may be sufficient for many people, but individual needs vary based on skin tone, location, and season. Consult your healthcare provider for personalised guidance.

Q: Can I get enough vitamin D from food alone?

It can be challenging to obtain sufficient vitamin D from food alone, as few foods are naturally rich in it. Fatty fish, fortified foods, and egg yolks are good sources, but supplementation may be needed, especially during winter.

Q: What is a healthy vitamin D level?

Optimal ranges may vary depending on the laboratory and guidelines used. Your healthcare provider can help interpret your results in the context of your overall health and lifestyle.

Vitamin D is a fundamental marker for preventive health, supporting bone strength, immune defence, and overall well-being. Regular monitoring helps you stay ahead of potential deficiencies.

Doctor's Assessment Included

When is this value abnormal?

See the value that applies to you:

Age years

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

up to 69 years Your group

Decision limits per result, in nmol/l
Result	Value (nmol/l)
Deficiency	< 30
Sufficient	≥ 30

70 years and older Your group

Decision limits per result, in nmol/l
Result	Value (nmol/l)
Severe deficiency	< 35
Deficiency	35–50
Sufficient	≥ 50

Nederlandse richtlijnen zijn het niet eens over deze grens. Het Zorginstituut stelt vast: "Er ontbreekt een eenduidige grens voor vitamine D-deficiëntie" (2022). Wij volgen de Gezondheidsraad, het NHG en het Farmacotherapeutisch Kompas. De NVKC hanteert 50 nmol/l voor iedereen; de osteoporoserichtlijn hanteert 50 nmol/l bij verhoogd fractuurrisico.

Source: Gezondheidsraad Reference population: Nederlandse bevolking (Gezondheidsraad 2012)

Source: Zorginstituut Nederland Reference population: Nederlandse bevolking (Gezondheidsraad 2012)

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Vitamin D (25-OH): what this test measures

This test measures the level of 25-hydroxyvitamin D in your blood, which is the main circulating form of vitamin D and the most reliable indicator of your overall vitamin D status.

Vitamin D (25-OH): why this value matters

Adequate vitamin D levels are essential for strong bones, a well-functioning immune system, and overall well-being. Low levels may be associated with an increased risk of bone disorders, mood changes, and weakened immunity. Consult your healthcare provider for personalised advice.

Vitamin D (25-OH): when is testing worthwhile?

Testing may be recommended if you experience fatigue, bone pain, or muscle weakness, or if you have limited sun exposure. Seasonal testing in autumn or winter can be helpful, as vitamin D production from sunlight is reduced during these months.

Vitamin D (25-OH): symptoms of a high or low value

Low Levels

Symptoms of low vitamin D may include fatigue, bone pain, muscle weakness, frequent infections, and mood changes such as feelings of low mood. In severe cases, it may be associated with bone softening or increased fracture risk.

High Levels

Excessively high vitamin D levels, usually from over-supplementation, may cause nausea, vomiting, weakness, and excessive calcium build-up, which can affect kidney function. Consult your healthcare provider if you suspect elevated levels.

Vitamin D (25-OH): what to do about an abnormal value

Male

If Low

Low vitamin D may cause fatigue, muscle weakness, and bone pain. Consider 2000-5000 IU daily supplementation and increase sun exposure.

If High

High vitamin D may indicate excessive supplementation. Reduce supplement dose and retest in 3 months.

Female

If Low

Low vitamin D may cause fatigue, muscle weakness, and bone pain. Consider 2000-5000 IU daily supplementation and increase sun exposure.

If High

High vitamin D may indicate excessive supplementation. Reduce supplement dose and retest in 3 months.

Vitamin D (25-OH): lifestyle and this value

Aim for regular, safe sun exposure of around 15–20 minutes daily when possible. Include vitamin D-rich foods such as fatty fish, egg yolks, and fortified dairy products. Consider supplementation during winter months after consulting your healthcare provider.

Vitamin D (25-OH): frequently asked questions

How much sunlight do I need for vitamin D?

Around 15–20 minutes of midday sun exposure on face and arms may be sufficient for many people, but individual needs vary based on skin tone, location, and season. Consult your healthcare provider for personalised guidance.

Can I get enough vitamin D from food alone?

It can be challenging to obtain sufficient vitamin D from food alone, as few foods are naturally rich in it. Fatty fish, fortified foods, and egg yolks are good sources, but supplementation may be needed, especially during winter.

What is a healthy vitamin D level?

Optimal ranges may vary depending on the laboratory and guidelines used. Your healthcare provider can help interpret your results in the context of your overall health and lifestyle.

Test Products

This marker is included in the following test panels.

Health Checkups

Extended Health Checkup

Broad health panel: blood count, thyroid, vitamins, lipids, liver, kidney and HbA1c.

Free T3 (Triiodothyronine) Free T4 (Thyroxine) TSH (Thyroid Stimulating Hormone) Vitamin B12 Vitamin D (25-OH) Ferritin HbA1c (Glycated Hemoglobin) HDL Cholesterol LDL Cholesterol Triglycerides Liver Function Test (LFT) Creatinine eGFR (Estimated Glomerular Filtration Rate) Basic Blood Count

€259,-

Health Checkups

Basic Health Checkup

Key health markers: CBC, lipids, and Vitamin D.

Vitamin D (25-OH) HDL Cholesterol LDL Cholesterol Triglycerides Basic Blood Count

€104,-

InsideTracker

An InsideTracker blood test with 35 biomarkers: heart, hormones, metabolism, inflammation, recovery and iron status. Measured in the Netherlands.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol GGT (Gamma-Glutamyl Transferase) Cortisol DHEA-S Estradiol (E2) Free Testosterone Total Testosterone Folate (Folic Acid) Vitamin B12 Calcium Ferritin Iron (Serum) Magnesium Potassium Progesterone Sodium Transferrin CRP (C-Reactive Protein) Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Total Cholesterol Albumin AST (Aspartate Aminotransferase) Vitamin D (25-OH) Insulin (Fasting) Leukocyte Differential Creatine Kinase (CK) Transferrin Saturation Triglycerides Basic Blood Count

€399,-

Health Checkups

Fatigue

Investigate some common causes of fatigue: CBC, thyroid, iron, vitamins, glucose, and HbA1c.

Free T3 (Triiodothyronine) Free T4 (Thyroxine) TSH (Thyroid Stimulating Hormone) Vitamin B12 Vitamin D (25-OH) Ferritin Glucose (Fasting) HbA1c (Glycated Hemoglobin) Basic Blood Count

€196,-

Whoop

A 43-biomarker comprehensive health panel inspired by WHOOP Advanced Labs — a deep look at metabolism, cardiovascular risk, hormones, liver, kidney and inflammation.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol Cortisol DHEA-S Estradiol (E2) Free Testosterone FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) Total Testosterone Bicarbonate Calcium Chloride Ferritin Iron (Serum) Magnesium Potassium Sodium Transferrin CRP (C-Reactive Protein) Homocysteine Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Total Cholesterol Albumin HOMA-IR ALP (Alkaline Phosphatase) AST (Aspartate Aminotransferase) Bilirubin (Total) Total Protein Urea (BUN) Creatinine Vitamin D (25-OH) eGFR (Estimated Glomerular Filtration Rate) Insulin (Fasting) Leukocyte Differential Transferrin Saturation Lipoprotein(a) Triglycerides Basic Blood Count

€499,-

Vitamins & Blood

Vegetarian

Key nutrients at risk on a plant-based diet: Ferritin, CBC, B12, Vitamin D, Zinc, Magnesium.

Vitamin B12 Vitamin D (25-OH) Ferritin Magnesium Zinc Basic Blood Count

€161,-

Whoop

Whoop Heart Health

A 45-biomarker heart health panel inspired by the WHOOP Heart Health Panel — an advanced look at cholesterol, lipoproteins, inflammation and kidney function.

Complete Blood Count (CBC) Leukocyte Differential ALP (Alkaline Phosphatase) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) Albumin Total Protein Bilirubin (Total) ApoB (Apolipoprotein B) Total Cholesterol LDL Cholesterol HDL Cholesterol Triglycerides Lipoprotein(a) Urea (BUN) Creatinine eGFR (Estimated Glomerular Filtration Rate) Calcium Bicarbonate Chloride Sodium Potassium Magnesium Cortisol DHEA-S Estradiol (E2) FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) SHBG (Sex Hormone Binding Globulin) Total Testosterone Free Testosterone TSH (Thyroid Stimulating Hormone) Glucose (Fasting) HbA1c (Glycated Hemoglobin) Insulin (Fasting) HOMA-IR CRP (C-Reactive Protein) Homocysteine Ferritin Iron (Serum) Transferrin Transferrin Saturation Vitamin D (25-OH) Cystatin C Uric Acid

€629,-

Whoop

Whoop Performance Health

A 50-biomarker performance panel inspired by the WHOOP Performance Health Panel — recovery, blood production, thyroid, hormones, iron and nutrient status for people who train.

€689,-

Whoop

Whoop Metabolic Health

A 51-biomarker metabolic panel inspired by the WHOOP Metabolic Health Panel — blood sugar regulation, insulin, thyroid, liver and the mineral cofactors behind your metabolism.

€799,-

Vitamins & Blood

Vitamin D Test

Measure your vitamin D, important for your bones, muscles and immune system. No referral needed, results within a few working days.

Vitamin D (25-OH)

€70,-

Whoop

Whoop Women's Health

A 53-biomarker women's health panel inspired by the WHOOP Women's Health Panel — fertility, cycle and thyroid hormones plus a complete metabolic and nutrient base.

€709,-

Whoop

Whoop Men's Health

A 48-biomarker men's health panel inspired by the WHOOP Men's Health Panel — testosterone, PSA and prostate health plus a complete metabolic and hormone base.

€659,-

InsideTracker

InsideTracker Recovery

A 10-biomarker recovery panel inspired by InsideTracker's Recovery category — muscle enzymes, liver values, electrolytes, magnesium and vitamin D behind your recovery score.

Magnesium CRP (C-Reactive Protein) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) GGT (Gamma-Glutamyl Transferase) Albumin Creatine Kinase (CK) Sodium Potassium Vitamin D (25-OH)

€139,-

InsideTracker

InsideTracker Inflammation

A 5-biomarker inflammation panel inspired by InsideTracker's Inflammation category — hs-CRP, a complete blood count with differential, vitamin D and ferritin behind your inflammation score.

CRP (C-Reactive Protein) Complete Blood Count (CBC) Leukocyte Differential Vitamin D (25-OH) Ferritin

€139,-

InsideTracker

InsideTracker Sleep

A 10-biomarker sleep panel inspired by InsideTracker's Sleep category — blood sugar regulation, magnesium, vitamin D, inflammation, testosterone and cortisol behind your sleep score.

Insulin (Fasting) Magnesium Glucose (Fasting) HbA1c (Glycated Hemoglobin) Vitamin D (25-OH) CRP (C-Reactive Protein) Complete Blood Count (CBC) Total Testosterone Cortisol HOMA-IR

€199,-

InsideTracker

InsideTracker Hormone Balance

A 12-biomarker hormone panel inspired by InsideTracker's Hormone Balance category — estradiol, progesterone, testosterone, SHBG, DHEA-S, cortisol, TSH and the minerals behind your hormone score.

Estradiol (E2) Progesterone TSH (Thyroid Stimulating Hormone) Insulin (Fasting) DHEA-S Free Testosterone Calcium Cortisol SHBG (Sex Hormone Binding Globulin) Total Testosterone Vitamin D (25-OH) Magnesium

€279,-

Medical standards

Dr. Naimi oversees the medical standards behind our content and assessments.

Medical policy

CIBG Ministerie van Volksgezondheid,
Welzijn en Sport Official BIG registration BIG 49928676701

Doctor's Assessment Included

Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.

Vitamin D (25-OH)

€35,-

When is this value abnormal?

up to 69 years Your group

70 years and older Your group

Vitamin D (25-OH): what this test measures

Vitamin D (25-OH): why this value matters

Vitamin D (25-OH): when is testing worthwhile?

Vitamin D (25-OH): symptoms of a high or low value

Low Levels

High Levels

Vitamin D (25-OH): what to do about an abnormal value

Male

Female

Vitamin D (25-OH): lifestyle and this value

Vitamin D (25-OH): frequently asked questions

Test Products

Extended Health Checkup

Basic Health Checkup

InsideTracker

Fatigue

Whoop

Vegetarian

Whoop Heart Health

Whoop Performance Health

Whoop Metabolic Health

Vitamin D Test

Whoop Women's Health

Whoop Men's Health

InsideTracker Recovery

InsideTracker Inflammation

InsideTracker Sleep

InsideTracker Hormone Balance

Read more about this blood value

Which disease causes vitamin D deficiency?

Frequent colds: when is it actually your immune system?

Staying strong with age: muscle, strength training and the blood values involved

Preventing osteoporosis: which blood values (vitamin D, calcium) to test

Medical standards