Low MCH means that red blood cells contain less hemoglobin, which can make it harder for the blood to carry oxygen throughout the body. Low MCH is often linked to anemia, especially iron deficiency anemia and genetic conditions like thalassemia.
Low MCH is usually identified through a blood test, and values below 26 picograms in adults are generally considered low. This result may also indicate hypochromia, a condition in which red blood cells appear paler because they contain less hemoglobin.
Low MCH can be associated with several health conditions, including iron deficiency anemia, thalassemia, sickle cell anemia, chronic diseases, and lead poisoning. Treatment depends on the underlying cause and may include supplements, medications, or, in more severe cases, blood transfusions.
What causes low MCH levels?
Low MCH can be associated with several conditions, including:
1. Iron deficiency anemia
Iron deficiency anemia, which is anemia caused by a lack of iron, is the most common cause of low MCH. It can lead to symptoms such as weakness, fatigue, and pale skin.
Common causes of iron deficiency anemia include a diet low in iron, heavy bleeding, or absorption problems such as celiac disease.
How it's treated: It is important to consult a primary care provider, who may recommend iron supplements, iron-rich foods like meat, beans, and lentils, and evaluation for possible causes of bleeding or poor absorption.
2. Thalassemia
Low MCH can also be related to thalassemia, a genetic disorder in which the body produces less hemoglobin or lower quality hemoglobin.
This condition may cause symptoms such as paleness, fatigue, a weak immune system, and delayed growth.
How it's treated: Follow-up with a hematologist is recommended. Depending on the severity of the condition, treatment may involve blood transfusions, folic acid supplements, and management of possible complications.
3. Sickle cell anemia
Low MCH may also indicate sickle cell anemia, a genetic condition that changes the shape of red blood cells, making them crescent- or sickle-shaped.
These abnormal cells have difficulty circulating and have a shorter lifespan, which can cause generalized pain, weakness, and apathy. Reed more about symptoms of sickle cell anemia and how it can present.
How it's treated: Regular follow-up with a hematologist is important. Treatment may include medications such as hydroxyurea, blood transfusions, and, in some cases, erythrocytapheresis, a procedure that helps reduce the need for transfusions.
4. Chronic diseases
Certain chronic diseases, such as kidney failure, autoimmune disorders like lupus or rheumatoid arthritis, and cancer, can also cause low MCH.
These conditions trigger inflammation that interferes with hemoglobin production, leading to anemia of chronic disease.
How it's treated: Treatment focuses on managing the underlying condition. A doctor may recommend iron supplements or medications that stimulate red blood cell production, such as erythropoietin.
5. Lead poisoning
Lead poisoning can also cause low MCH because this toxic metal interferes with hemoglobin production and can damage the bone marrow.
Also recommended: Heavy Metal Poisoning (Lead, Arsenic, Mercury & More) tuasaude.com/en/heavy-metal-poisoningSymptoms of lead poisoning may include nausea, vomiting, diarrhea, and abdominal cramps.
How it's treated: Seek immediate medical attention for evaluation and follow-up. In more severe cases, chelation therapy may be needed to help remove lead from the body.
Understanding combined MCV, MCH, and RDW results
Looking at MCV, MCH, and RDW together in a blood test helps doctors better identify the type of anemia or blood disorder that may be present.
Evaluating these results together allows doctors to better understand red blood cell changes and identify the underlying cause of anemia.
How to know if MCH is low
To determine if your MCH is low, it is necessary to see a primary care doctor, who will order a complete blood count (CBC).
Also recommended: MCH Blood Test (What Low or High MCH Levels Mean) tuasaude.com/en/mch-blood-test