Red blood cells carry oxygen; this test counts them to check for anemia, hydration issues, and overall blood health.
Red blood cells, or erythrocytes, are the most common cells in your blood. They carry hemoglobin, the protein that transports oxygen from your lungs to your tissues and carries carbon dioxide back.
The red blood cell count measures how many of these cells you have in a set volume of blood. It is a core part of the complete blood count and is read with hemoglobin and hematocrit.
A red blood cell count helps assess for anaemia, when it is low, or an excess of red cells, when it is high. A low count often goes with low hemoglobin and points to iron, B12 or folate deficiency, blood loss, or chronic illness.
A high count can reflect dehydration, smoking, low oxygen from lung or heart conditions, or a bone marrow disorder. The count is most useful read with hemoglobin, hematocrit, and the red cell indices that describe cell size and content.
Aniva reads your result against research-backed ranges, not just the lab's wide normal. The reference shown below is specific to this biomarker.
Ranges are guidance, are sex-specific, and vary by laboratory.
| Group | Reference range (SI) |
|---|---|
| Women | 3.9 to 5.2 x10^12/L |
| Men | 4.3 to 5.7 x10^12/L |
Aligned to German laboratory practice (DGKL). Always interpret against your own lab's range.
Dehydration can raise the count and overhydration can lower it. Pregnancy lowers it. Very high white cell counts or clumped platelets can interfere with some analysers. Recent transfusion changes the result.
Read together with hemoglobin, hematocrit, and red cell indices (MCV, MCH, MCHC), plus iron studies when anaemia is suspected.
What does my RBC result mean? It shows how many oxygen-carrying red cells you have. Low often suggests anemia; high can occur with dehydration or altitude.
Do I need to fast? No. Eating does not affect the RBC count. Stay hydrated unless your clinician advises otherwise.
What can affect my result? Dehydration, IV fluids, hard exercise, smoking, altitude, pregnancy, recent donation, illness, and some medicines can shift counts.
How often should I test RBC? Often during routine checkups or when you have symptoms. Your clinician may recheck after treatment or if results were borderline.
How long do results take? Results are usually ready in about 7 days.
What should I discuss with my clinician? Share symptoms, medications, and supplements, plus recent donations, travel to altitude, periods, or pregnancy. Ask if iron, B12, folate, or reticulocytes are needed.
One annual membership, 100+ biomarkers, every result explained in plain language with a personalized action plan and concierge guidance.
