IgM – what do your levels mean?
Have you had your IgM level measured and are unsure what the numbers mean? Here's 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 IgM?
What is the normal range for IgM?
The normal range for IgM varies depending on age and gender. For newborns (0-14 days), the value is below 0.35 g/L. For infants (14-91 days), the range is between 0.12-0.71 g/L, and for children up to 1 year, it is 0.16-0.86 g/L. From 1 to 18 years, the normal range is 0.48-1.86 g/L. For adult women between 18-50 years, the range is 0.55-2.30 g/L, while for men in the same age group, it is 0.39-2.08 g/L. After 50 years, the normal range is the same for both sexes, namely 0.39-2.08 g/L. However, these values may vary slightly depending on the laboratory's measurement methods and equipment. Being close to the limit values may indicate a need for further investigation, especially if there are clinical symptoms.
What does a low level mean?
A low level of IgM can indicate an immune deficiency, either primary or secondary. Primary immune deficiencies such as X-linked agammaglobulinemia or selective IgM deficiency are rare but serious conditions often detected early in life. Secondary causes may include chronic diseases such as multiple myeloma, chronic lymphocytic leukemia, or nephrotic syndrome, where the body loses proteins through urine. Symptoms of low IgM can include frequent and prolonged infections, especially in the respiratory tract. Particularly vulnerable groups include individuals with known immune deficiencies or chronic diseases. If low IgM is suspected, a doctor should be contacted for further diagnosis and possibly treatment such as immunoglobulin replacement therapy.
What does a high level mean?
An elevated level of IgM can be a sign of an acute infection, as IgM is the first antibody produced in response to an infection. It can also be seen in chronic inflammatory conditions such as primary biliary cirrhosis or autoimmune diseases like rheumatoid arthritis. Other causes include lymphoproliferative diseases such as Waldenström's macroglobulinemia. Symptoms can vary from fatigue and weight loss to specific signs of the underlying disease, such as jaundice in liver diseases. If the IgM level is significantly elevated, a doctor should be consulted for further investigations, as it may require treatment of the underlying cause, such as infection or autoimmune disease.
Get your IgM level tested
At Celto, you can order a blood test for IgM 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 will receive your results directly on sundhed.dk, just like all other public blood tests.
How it works
When you order a blood test from Celto, you choose which markers you want tested – no doctor's referral needed. After your purchase, you will receive an email with a link to our booking system, where you choose time and location. The blood sample itself is taken by authorized healthcare professionals and typically only takes a few minutes.
Where you can get tested
Celto has over 34 sample collection sites at public hospitals and clinics throughout 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, with the exact same quality and same tests. You will receive your results directly on sundhed.dk within a few business days, and Celto will also send an easy-to-understand overview of your values so you know what the numbers mean.