Vitamin D – what do your levels mean?
Have you had your vitamin D levels measured and are unsure what the numbers mean? Here, you’ll find a clear explanation of the normal range, what high or low levels can signify, and when it makes sense to get tested.
What is the normal range for vitamin D?
What is the normal range for vitamin D?
The normal range for vitamin D (25-hydroxyvitamin D) in the blood is generally between 50 and 160 nmol/L. This interval can vary depending on the laboratory and the season, as vitamin D levels are often higher in summer due to increased sun exposure. For individuals with special needs, such as those with osteoporosis or kidney disease, an optimal level may be between 75 and 150 nmol/L. A level below 50 nmol/L is considered insufficient, while values below 25 nmol/L indicate a severe deficiency. It is important to note that toxic levels are typically above 200 nmol/L. Variations can also occur based on age, gender, and individual health conditions.
What does a low level mean?
A low level of vitamin D can lead to a range of health problems. Symptoms include muscle weakness, fatigue, bone pain, and in severe cases, osteomalacia in adults or rickets in children. The most common causes of low vitamin D are insufficient sun exposure, poor diet, malabsorption, or certain medical conditions such as kidney disease. Particularly vulnerable groups include the elderly, people with dark skin, pregnant women, and those who wear covering clothing. Treatment often involves vitamin D supplementation and increased sun exposure. It is recommended to consult a doctor for correct dosage and follow-up.
What does a high level mean?
A high level of vitamin D, often above 200 nmol/L, can lead to toxicity. Symptoms include nausea, vomiting, loss of appetite, constipation, muscle weakness, and in severe cases, kidney damage due to elevated blood calcium (hypercalcemia). Causes can include excessive intake of vitamin D supplements or medical errors. Individuals taking high doses of vitamin D should regularly monitor their blood levels. If symptoms of toxicity occur, it is important to stop supplementation and seek medical attention immediately. Treatment may include fluid therapy and medication to lower calcium and vitamin D levels.
Get your vitamin D levels tested
At Celto, you can order a vitamin D blood test directly online – without a referral from your doctor and without long waiting times. We have over 34 sample collection sites at public hospitals across Denmark, and your samples are analyzed in the same accredited laboratories used by the rest of the healthcare system. You receive your results directly on sundhed.dk, just like all other blood tests from the public system.
How it works
When you order a blood test from Celto, you choose which markers you want to have tested – no doctor's referral necessary. After your purchase, you will receive an email with a link to our booking system, where you choose a time and location. The blood test itself is taken by authorized healthcare professionals and typically takes only a few minutes.
Where you can get tested
Celto has over 34 sample collection sites at public hospitals and clinics around Denmark. You choose the location that suits you best among our partners, and there are typically available appointments within a few days. Find your nearest sample collection site →
How to get your results
Your blood samples are analyzed in the same laboratories used by your own doctor and the rest of the healthcare system – the exact same quality and the same tests. You receive your results directly on sundhed.dk within a few business days, and Celto also sends an easy-to-understand review of your values so you know what the numbers mean.