When you have a blood test, you must have seen that the report has various things written down with each letter and number. Sometimes when we see these, we cannot even imagine what they are, and we can get a little worried. Similarly, one important value that you will see in your complete blood count (CBC) report is MCH . Today, let's talk about what this MCH or ``Mean Corpuscular Hemoglobin'' is, what it says about our health, and what happens if that value increases or decreases very simply.
What exactly is MCH?
Simply put, MCH is a value that measures the average amount of hemoglobin in your red blood cell (RBC) . Now think about what hemoglobin is. Hemoglobin is a very important protein inside our red blood cells. It is this protein that takes oxygen from our lungs and delivers it to the cells throughout the body. It is like a `delivery` person who brings food home. This oxygen is what gives energy to every cell in our body, and everything in our body works properly. So, we can get some idea about this hemoglobin from the MCH value.
MCH is just one value in the ``RBC indices`` section of the ``CBC`` test that describes red blood cells. There are several other values like this:
- MCV `(Mean Corpuscular Volume)` : This tells you the average size of your red blood cells, that is, whether they are large or small.
- MCHC `(Mean Corpuscular Hemoglobin Concentration)` : This also refers to the concentration of hemoglobin in a red blood cell. However, unlike MCH, MCHC also takes into account the size of the red blood cells.
- RDW `(Red Blood Cell Distribution Width)` : This measures how different your red blood cells are in size. That is, are there any discrepancies, such as some cells being small and some cells being large.
Doctors use all of these details to determine the health of your red blood cells. These values are especially important for diagnosing conditions like anemia .
When is an MCH test needed?
MCH is a common part of a CBC test. This CBC test not only measures your red blood cells, but also your white blood cells (the cells that protect us from disease) and platelets (the cells that help blood clot). So, when combined with other CBC values, doctors can detect early signs of a medical condition.
Your doctor will be especially concerned about your MCH value if you have symptoms of anemia, such as fatigue, frequent headaches, paleness, and shortness of breath . If your MCH value is abnormal compared to other RBC indices, it can help your doctor determine whether you have anemia and, if so, what the cause might be.
How is this test done?
The MCH test is a very simple blood test. Usually, a nurse or a phlebotomist takes a small amount of blood from you. The blood sample is then analyzed by an automated blood counter. This machine provides information about the cells in your blood.
The MCH value is calculated when your red blood cells are analyzed.
Do you need to prepare before the test?
In most cases, no special preparation is required for a MCH test. However, if your doctor is planning to do several other tests on the same blood sample, you may need to fast (not eat or drink anything) for a few hours . Therefore, follow your doctor's instructions carefully. Then you can prepare for the test properly.
What happens during the test?
They'll make you sit in a chair and tell you to hold out your hand. Then:
- The blood collection site is cleaned with an antiseptic solution (alcohol wipe).
- A rubber band (tourniquet) is tied slightly above the blood collection site on the arm. This helps the blood pool and makes it easier to collect blood.
- A very fine needle is slowly inserted into the vein.
- A small amount of blood is collected in a small vial or tube.
- Then the needle is removed and a piece of cotton is placed to stop the bleeding.
All of this takes less than five minutes . When the needle is inserted, you may feel a slight tingling sensation, like an ant stinging. Other than that, there is no major pain.
What happens after the test?
After donating blood, if you don't feel a little dizzy, you can go home right away. Some people may feel a little dizzy when they see blood, or if they are a little scared of needles. This is normal, and you are not alone. If this happens, the medical staff will take care of you until you feel better.
Are there any risks to this test?
The CBC test to check MCH is not a high-risk test. After donating blood, you may notice a slight bruise where the needle was inserted. You may also feel some pain in your arm. However, these symptoms usually go away on the same day as the blood donation.
What are the results? What do they tell us?
MCH results show how many picograms (pg/cell) of hemoglobin you normally have in one red blood cell. A picogram is a very small amount, about one trillionth (that's one and twelve zeros) of a gram.
Although there are slight variations between labs, the normal MCH value for an adult (both male and female) is generally between 27 and 33 pg/cell . Anything below this value is considered low MCH , and anything above this value is considered high MCH .
But remember, you don't need to panic immediately if your MCH value is low or high. Your doctor will compare your MCH value with other RBC indices and your overall health to make a decision. He or she may also recommend additional tests.
If the MCH value is low (Low MCH)
A low MCH value means you may have hypochromic anemia (where red blood cells are less than normal and appear pale) and/or microcytic anemia (where red blood cells are abnormally small). In both of these conditions, your red blood cells do not have enough hemoglobin.
Several reasons can cause low MCH levels:
- Iron Deficiency : When the body does not get enough iron, it cannot make hemoglobin. The main cause of anemia caused by iron deficiency is bleeding . This can be caused by things like heavy menstrual bleeding, internal bleeding (e.g., intestinal ulcers), or excessive bleeding after surgery.
- Hemoglobinopathies : Some inherited blood disorders can cause problems with the way the body makes hemoglobin. Examples include thalassemia and sickle cell anemia .
- Inflammation due to chronic diseases : Inflammation in the body due to conditions such as certain chronic infections, kidney disease, liver disease, and cancer can cause a decrease in MCH levels.
If the MCH value is high (High MCH)
A high MCH level means you may have macrocytic anemia . In this condition, your body produces abnormally large red blood cells, and those cells have high levels of hemoglobin. This is often caused by not getting enough folate (vitamin B9) and vitamin B12, two key nutrients needed to make healthy red blood cells. Or, you may have a medical condition that prevents your body from absorbing these nutrients properly.
Other reasons for an increase in MCH value:
- Long-term alcohol use disorder .
- Thyroid gland problems .
- Side effects of certain medications or treatments . For example, chemotherapy for cancer can cause an increase in MCV (and thus MCH) as a side effect.
If the results are abnormal, what do you do next?
If your MCH is abnormal, the next steps you take will depend on the cause. For example, if your doctor suspects that your MCH is low due to iron deficiency, they may order additional tests to check your iron levels. Otherwise, if they suspect another medical condition, they may need to do tests for that condition.
Your doctor will advise you exactly what to do based on your results.
It's normal to feel a little nervous or scared when any test result is abnormal (whether low or high). But when it comes to MCH, an abnormal result just means that your doctor has learned more about your health. Sometimes, an abnormal MCH result could be something that needs to be monitored and treated, like a hereditary blood disorder. But sometimes, it could be something short-term and nothing to worry about. If you're worried or concerned about your MCH result, talk to your doctor about it and compare it to other CBC results to see how it makes sense.
Take-Home Message
MCH is an important number on your blood test report. It tells you the average amount of hemoglobin in one of your red blood cells.
- Hemoglobin is the protein that carries oxygen throughout the body.
- A low MCH value can be a sign of anemia. Iron deficiency, certain blood diseases, and chronic inflammatory conditions can cause this.
- An elevated MCH value is also a sign of another type of anemia. This can be caused by things like folate or vitamin B12 deficiency, alcohol use, or thyroid problems.
- Don't panic if your MCH value is abnormal. Your doctor will compare it with other test values, perform further tests if necessary, and provide you with the most appropriate advice and treatment.
If you have any questions about what's on your blood report, it's best to ask your doctor.
` MCH, hemoglobin, red blood cells, anemia, blood test, CBC, health
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