IgG – what do your levels mean?
Have you had your IgG level measured and are unsure what the numbers mean? Here's a clear explanation of the normal range, what high or low levels can mean, and when it makes sense to get tested.
What is the normal range for IgG?
What is the normal range for IgG?
The normal range for IgG varies depending on age and gender. For newborns (0-14 days), the range is 3.2-14.1 g/L. For children between 1 and 4 years, it's 3.2-11.5 g/L, while for children between 10 and 18 years, it's 6.6-15.3 g/L. For adult women aged 18-50, the range is 6.9-15.7 g/L, and for women over 50 and men over 18, it's 6.1-14.9 g/L. These values may vary depending on the laboratory's analysis methods. Being close to the limit values can indicate incipient immunological changes and should be assessed by a doctor.
What does a low level mean?
A low level of IgG can indicate immune deficiencies, which can lead to an increased risk of infections, especially bacterial ones. Symptoms can include frequent respiratory infections, sinusitis, and pneumonia. Causes can be primary, such as inherited conditions like X-linked agammaglobulinemia, or secondary, such as chronic diseases like kidney disease or certain cancers. Particularly vulnerable groups include people with autoimmune diseases or those receiving immunosuppressive treatment. A low IgG level should prompt a consultation with a doctor for further investigation and possible treatment, which may include immunoglobulin replacement therapy.
What does a high level mean?
An elevated level of IgG can be due to chronic stimulation of the immune system, as seen in autoimmune diseases like systemic lupus erythematosus, chronic active hepatitis, or infections. Symptoms can vary from fatigue and joint pain to more serious manifestations like organ damage. Other causes include multiple myeloma or other lymphoproliferative disorders. It is recommended to seek medical advice if elevated IgG is found, especially if accompanied by symptoms such as weight loss, fever, or night sweats. Treatment depends on the underlying cause and may include medical treatment or further diagnostic examinations.
Get your IgG level tested
At Celto, you can order an IgG blood test directly online – without a doctor's referral and without long waiting times. We have over 34 sample collection sites at public hospitals throughout Denmark, and your samples are analyzed at 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 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 needed. After your purchase, you will receive an email with a link to our booking system, where you choose a time and place. The blood test 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 at the same laboratories used by your own doctor and the rest of the healthcare system, with the exact same quality and the same tests. You will receive your results directly on sundhed.dk within a few working days, and Celto will also send an easy-to-understand review of your values so you know what the numbers mean.