Hemoglobin range: Hemoglobin is a protein in red blood

Hemoglobin is a protein in red blood cells that carries oxygen and carbon dioxide. Learn about normal hemoglobin levels by age and gender, causes and symptoms of low and high hemoglobin , and how to measure hemoglobin with blood tests. Learn what hemoglobin levels are, how they are measured and what factors can affect them. Find out the normal hemoglobin ranges by age and sex, and the symptoms and causes of high or low hemoglobin levels. Find out what constitutes normal haemoglobin levels and their significance for overall health. Learn about the range of haemoglobin levels and the factors affecting them. Hemoglobin is a vital component of your blood. Learn why doctors test your hemoglobin levels during routine blood work and what abnormal results may mean.