Doctor's Assessment Included
Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.
Hemoglobin: Normal Values and What High or Low Means
Hemoglobin is your primary oxygen-delivery molecule and a cornerstone metric for endurance performance. Monitoring hemoglobin levels helps active individuals assess training adaptations, identify early signs of overtraining, and optimise recovery strategies.
Reference Ranges
Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.
What It Measures
This test measures the concentration of hemoglobin in your blood, expressed in grams per decilitre (g/dL). Hemoglobin is an iron-containing protein that enables red blood cells to carry oxygen from the lungs to tissues and return carbon dioxide to the lungs.
Why It Matters
Hemoglobin is central to oxygen delivery throughout the body. Low levels may indicate iron deficiency anemia, chronic disease, or blood loss, while elevated levels can be associated with dehydration, lung disease, or polycythemia. It is one of the most commonly tested blood markers.
When to Test
Hemoglobin is measured as part of a complete blood count (CBC) during routine screenings, when investigating fatigue or weakness, during pregnancy, or for monitoring conditions that affect red blood cell production.
Symptoms
Low Levels
High Levels
Lifestyle Tips
Eat iron-rich foods such as lean red meat, spinach, and legumes. Pair iron sources with vitamin C to enhance absorption. Avoid excessive tea or coffee with meals as they can inhibit iron uptake. Stay hydrated and maintain regular exercise for healthy circulation.