Does Hemoglobin level rises above the normal range?

Yes, hemoglobin levels can rise above the normal range in certain conditions. This is known as erythrocytosis or polycythemia. Primary erythrocytosis, also known as polycythemia vera, is a rare blood cancer that causes the bone marrow to produce too many red blood cells. This leads to an increase in hemoglobin levels and can cause symptoms such as fatigue, shortness of breath, headaches, and dizziness. Secondary erythrocytosis, also known as reactive erythrocytosis, occurs when hemoglobin levels increase in response to another underlying condition. This can be caused by conditions such as chronic lung disease, heart disease, kidney disease, or certain medications.