Have you ever had a blood test? The report you get when you do that has letters and numbers on it, right? Sometimes we don't really understand what these are when we see them. Similarly, MCV is an important value measured in your Complete Blood Count (CBC) test. Today, let's talk about what MCV is, what it can tell us, and what happens if it is too low or too high.
What is MCV (Mean Corpuscular Volume)? Simply put...
Simply put, MCV (Mean Corpuscular Volume) is a measure of the average size of your red blood cells. Okay, so what are these red blood cells? They're the ones that carry oxygen throughout your body. Like little vehicles, these red blood cells pick up oxygen from your lungs and deliver it to every other cell in your body. So the size, or volume, of these "vehicles" is very important. And the characteristics of these red blood cells - including their size - tell us how well they can transport oxygen.
Why is MCV important?
Now, this MCV value is very important to us because if you have a large number of red blood cells in your blood, whether they are unusually large (macrocytic) or unusually small (microcytic), it can give you a clue about a certain medical condition. However, if your blood sample contains a mixture of red blood cells of different sizes, then the MCV value may not be as useful. Because in that case, even if some cells are small and some are large, when you take the average of all of them, it may be within the normal range. That is why doctors do not make decisions based on the MCV value alone.
Is MCV part of the CBC test? What are the other RBC tests?
Yes, MCV is something that is usually measured by an automated machine during your regular Complete Blood Count (CBC) test. It is included in the section of the CBC report that details red blood cells, that is, the RBC category (RBC Indices) . There are several other tests that belong to this RBC category. Let's see what they are:
- MCV (Mean Corpuscular Volume): This is what we're talking about, the average size of your red blood cells.
- MCH (Mean Corpuscular Hemoglobin): This refers to the average amount of hemoglobin in a single red blood cell. Hemoglobin is a very important protein that helps red blood cells carry oxygen.
- MCHC (Mean Corpuscular Hemoglobin Concentration): This measures the concentration of hemoglobin in a volume of your red blood cells, that is, how much hemoglobin is inside those red blood cells.
- RDW (Red Cell Distribution Width): This measures how varied your red blood cells are in size. This means that some cells are small, some are large, all different sizes, or are they mostly the same size.
MCV alone cannot accurately diagnose a disease. It is only by combining these results with the results of other tests that the doctor can get a complete picture of the health of your red blood cells.
When is an MCV test done?
The MCV test is usually done every time you have a CBC. That is, it is usually done routinely if you have symptoms and a doctor orders a blood test, or during something like an annual medical checkup.
Changes in MCV can be caused by a variety of medical conditions. For example, iron-deficiency anemia can cause a low MCV. If this is the case, your doctor may recommend further testing for iron deficiency.
Also, the MCV value can change in conditions such as liver disease or vitamin B12 or folate deficiency .
How is the MCV test done?
It's very simple. A doctor or a trained nurse takes a small sample of blood from a vein in your arm. Then they send it to a lab to be tested. At the lab, they use an automated machine, and sometimes a microscope, to measure the average size of your red blood cells, called the MCV.
Does this test require any special preparation?
No, the MCV is part of the CBC test, so there is no special preparation required. You can do as you normally would. Sometimes, if you are having other tests (such as fasting blood sugar) along with the CBC, you may be instructed to fast. However, there is no special preparation required for the MCV test alone.
What kind of experience do you have when you get blood drawn?
As you sit in a chair, a nurse will clean the area where the blood will be drawn with an alcohol swab. Then a tourniquet will be tied around the top of your arm so that the vein can be seen clearly. You will feel a slight tingling sensation, then a slight stinging sensation as the needle is inserted, like being bitten by an ant. The blood will be quickly collected into a small vial. Once the required amount has been obtained, the needle will be removed. The entire process takes less than five minutes .
What happens after blood is drawn?
A piece of cotton will be placed on the site of the blood draw and a plaster will be applied to stop the bleeding. If you do not feel dizzy or faint, you can go home immediately. If you feel any discomfort, you will be told to stay for a while and leave when you feel better. There is nothing to worry about.
Are there any risks to this test?
The MCV test, which involves taking a small amount of blood, is very safe. There may be some soreness where the needle is inserted, and maybe some bruising, for a day or two. But that will go away quickly. Other than that, there are no major risks associated with this test.
How long does it take to receive the MCV report?
The results of a complete blood count (CBC), including the MCV value, are usually available the same day or the next day after the blood is donated. Some labs can provide results within a few hours. It is a good idea to ask your doctor or lab how you will receive the report (by phone, in writing, or through an online portal) and when it will be available.
What are the results like? What do they tell us?
The MCV value you receive will be shown as a number on the report. It will also indicate the normal range. So you can check if your value is within the normal range. A normal MCV value should be between 80 and 100 femtoliters (fl). This value can vary slightly from lab to lab, but most of the time it is within this range.
What is the MCV value that should be considered?
Whether your MCV is low or high, it can be a sign of a medical condition. However, don't panic just by looking at your MCV. Your doctor will take into account your MCV, the results of other tests (such as MCH, MCHC, RDW), and your symptoms to make a diagnosis.
Decreased MCV value (Microcytosis)
If the MCV is less than 80 fl, it is called microcytosis . This means that the red blood cells are smaller than normal. This can be caused by:
- Iron-deficiency anemia: This is the most common cause. When the body doesn't get enough iron, red blood cells don't form properly.
- Thalassemia: This is an inherited disease. This condition is caused by a defect in the production of hemoglobin.
- Other hemoglobin disorders.
Increased MCV value (Macrocytosis)
If the MCV is greater than 100 fl, it is called macrocytosis . This means that the red blood cells are larger than normal. This can be caused by:
- Vitamin B12 deficiency or folate deficiency: These can cause anemia, such as pernicious anemia . These vitamins are essential for the production of red blood cells.
- Liver disease: When liver function is impaired, the number of red blood cells can be affected.
- Bone marrow dysfunction: For example, in conditions like myelodysplastic syndrome, the bone marrow is unable to produce healthy red blood cells.
- People taking certain anti-cancer treatments (chemotherapy) may also have an increased MCV value, because these drugs affect the bone marrow.
- Excessive alcohol consumption can sometimes cause an increase in MCV.
Remember, a doctor won't tell you that you have a serious illness just because your MCV is outside the normal range. It doesn't give a complete picture of your red blood cells. However, when combined with other tests in the RBC category, the MCV test can help you understand how your red blood cells are functioning.
So, what are the things we need to remember from all of this?
MCV is a test that measures the average size of your red blood cells. It is part of the CBC (Complete Blood Count).
- Red blood cells are what carry oxygen throughout the body, so their size and health are very important.
- A low (microcytosis) or high (macrocytosis) MCV value can indicate certain health conditions (e.g. iron deficiency, vitamin deficiencies, liver disease, thalassemia, etc.).
- However, you cannot make a diagnosis based on the MCV value alone. The doctor will make a decision based on other tests and your symptoms. Therefore, if your MCV value is not within the normal range, do not panic and follow your doctor's instructions.
- If you have any doubts about your MCV value, or if you don't understand something in the report, talk to your doctor about it. He or she will explain it to you.
So, the next time you see a blood report and it says MCV, now you know what it means. Stay healthy everyone!
` Blood Test, MCV, Mean Corpuscular Volume, CBC, Red Blood Cells, Hemoglobin, Anemia, Microcytosis, Macrocytosis, Blood Test
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