Red blood cells – what do your levels mean?
Have you had your red blood cell levels measured and are unsure what the numbers mean? Here you'll find a clear explanation of the normal range, what a high or low level can indicate, and when it makes sense to get tested.
What is the normal range for red blood cells?
What is the normal range for red blood cells?
The normal range for red blood cells (erythrocytes) varies depending on age, sex, and the laboratory's measurement methods. For adult men, it typically ranges from 4.3 to 5.7 x 10¹²/L, for women between 3.9 and 5.2 x 10¹²/L, and for children, values vary with age but are generally slightly lower. Newborns may have higher values, often up to 6.0 x 10¹²/L or slightly above. These values may vary slightly from laboratory to laboratory. Levels close to the thresholds can indicate early stages of diseases or physiological conditions such as dehydration or pregnancy, and should be evaluated by a doctor.
What does a low level mean?
A low level of red blood cells is called anemia and can lead to symptoms such as fatigue, dizziness, shortness of breath, and paleness. Causes include iron deficiency, vitamin B12 or folic acid deficiency, chronic diseases such as kidney failure or inflammatory conditions, as well as blood loss from, for example, the gastrointestinal tract. Pregnant women and individuals with a restrictive diet are particularly vulnerable. If a low level is suspected, one should contact a doctor to have a blood test performed and determine the underlying cause so that appropriate treatment can be initiated.
What does a high level mean?
A high level of red blood cells, also called polycythemia, can cause symptoms such as headache, dizziness, flushed skin, and high blood pressure. It can be due to dehydration, chronic lung diseases, or rarer diseases such as polycythemia vera, where the bone marrow produces too many red blood cells. Smoking and living at high altitudes can also lead to elevated values. It is important to seek medical advice if a high level is suspected, as it can increase the risk of blood clots, and treatment may be necessary to reduce blood viscosity.
Get your red blood cell levels tested
At Celto, you can order a red blood cell 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 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 necessary. After your purchase, you will receive an email with a link to our booking system, where you choose a time and place. 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 best suits you 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 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 review of your values so you know what the numbers mean.