My Hb (Haemoglobin) is 115. Do I Have Anaemia?

My Hb (Haemoglobin) is 115. Do I Have Anaemia?

Yes/no. You may have. But it depends. We will explain.

1. What a Haemoglobin Level of 115 Means

• The Diagnostic Threshold: Yes/no. A haemoglobin (Hb) result of 115 g/L is the exact entry point used to diagnose anaemia in women, but it represents clear anaemia for men.

• The Sex-Specific Ranges: Medical guidelines (such as the World Health Organization) categorise normal adult haemoglobin thresholds differently based on biological sex:

  • Normal for Men: 130 g/L or above

  • Normal for Non-Pregnant Women: 120 g/L or above

  • Normal in Pregnancy: 110 g/L or above (due to increased blood volume)

• The Diagnosis: At 115 g/L, if you are a man, you are definitely anaemic. If you are a non-pregnant woman, you are mildly anaemic. If you are pregnant, this reading is completely normal.

2. Confirming Your Diagnosis (the ‘But’)

• The Red Cell Indices (‘but’): A single Hb reading of 115 only confirms that your red blood cell count is low; it does not tell you why. To establish a useful diagnosis, your GP surgery must look at the size of your red blood cells (MCV) on your Full Blood Count (FBC) result.

• Investigating the Root Cause: Anaemia is a sign of an underlying issue, not a complete diagnosis in itself. Healthcare professionals will use your MCV to determine if your cells are too small (suggesting iron deficiency), normal-sized (suggesting chronic illness), or too large (suggesting B12 or folate deficiency).

3. Factors That Cause the Sex Differences

• Menstrual Blood Loss: Women of childbearing age regularly lose iron through menstruation. Because iron is a core building block of haemoglobin, the body naturally adapts to a slightly lower baseline threshold.

• Hormonal Influences: Testosterone stimulates the bone marrow to produce more red blood cells, which naturally drives the normal baseline higher in men. Estrogen does not have this same stimulating effect.

• Pregnancy Dilution: During pregnancy, a woman’s blood volume expands significantly to support the fetus. This extra fluid dilutes the concentration of red blood cells, which is why a lower reading of 115 g/L is perfectly healthy in this context.

4. Immediate Medical Next Steps

• Identify Iron Levels: Your healthcare team will likely check your ferritin levels (stored iron). If iron deficiency is confirmed, they will recommend a course of iron supplements and advise on dietary improvements.

• Review for Blood Loss: Doctors must identify why your iron or red cells are low. For women, this often involves evaluating heavy periods. For men and postmenopausal women, it frequently requires ruling out hidden blood loss in the gut.

• Check Key Vitamins: Ensure your diet includes adequate vitamin B12 and folate, as a lack of these nutrients prevents your bone marrow from manufacturing healthy, mature red blood cells.

5. Opportunity for Energy Restoration

• Catching it Early: Because 115 g/L is a mild form of anaemia, your body is in an excellent position to respond quickly to early, targeted treatment before severe fatigue sets in.

• Resolving Symptoms: Mild anaemia can cause subtle symptoms like tiredness, mild shortness of breath on exertion, or dizziness. Correcting the underlying deficiency often leads to a rapid, noticeable boost in your daily energy levels.

• Preventing Complications: Identifying a level of 115 g/L early allows you to fix the root cause before your haemoglobin drops further, protecting your heart from having to work harder to pump oxygen around your body.

Note: A haemoglobin result of 115 g/L requires a formal review with your GP surgery or healthcare team to evaluate the full blood count breakdown, determine the specific type of anaemia, and organise any necessary follow-up testing.