Do you sometimes feel very tired and lifeless for no reason? Or do you find it difficult to concentrate on anything, and your head feels like it's covered in fog? One reason for things like this could be a decrease in the level of vitamin B12 , an essential nutrient for our body. Vitamin B12 is essential for the production of red blood cells in our body and for the healthy functioning of the nervous system. So when it is low, various problems can arise. That's why today we are talking about a blood test that checks the level of vitamin B12.
Do I need to get this B12 test too?
It is very rare for someone who eats a well-balanced diet to become deficient in vitamin B12. However, there are a number of reasons why your B12 levels may be lower than normal. There are several reasons why your doctor may recommend a B12 test .
Imagine, you often tell your doctor, “Doctor, I feel so tired, my limbs are numb, and I can’t remember anything.” At a time like this, the doctor might think about other illnesses and might even suspect your B12 levels.
A doctor is more likely to recommend this test in the following cases:
- If you have been diagnosed with anemia .
- If you suspect you have a medical condition that prevents your body from absorbing B12.
- If some medications you take affect the absorption of B12.
- If you have symptoms related to B12 deficiency.
- If you are accustomed to a completely vegan or strict vegetarian diet.
The main condition associated with B12 malabsorption is what doctors call 'Pernicious Anemia.' This is caused by a deficiency of 'Intrinsic Factor,' a special protein produced in our stomach. Without this protein, we cannot absorb B12 from food. Conditions such as Crohn's disease and Celiac disease can also cause low B12 levels.
In addition, some medications you take can also affect this. Some medications, especially those commonly used to treat gastritis (GERD), such as proton-pump inhibitors, reduce stomach acid. This stomach acid is needed to release B12 from food and allow it to be absorbed by the body. So, long-term use of these medications can lower B12 levels.
What are the main symptoms of B12 deficiency?
When vitamin B12 levels are low, each person may experience different symptoms. However, there are some common symptoms. These can also be symptoms of other diseases, so it is important to get a B12 test to confirm.
| Symptom | A simple explanation |
|---|---|
| Frequent fatigue | Feeling lifeless even after sleeping well and doing nothing. |
| Difficulty in making up your mind (Fuzzy thinking) | Feeling dizzy, having trouble remembering things, feeling scattered. |
| Numbness or tingling in the limbs | A tingling or numb feeling in the hands and feet. |
| Headaches | Headaches that are more frequent or unusual than usual. |
| Moodiness | Feeling angry, sad, or mentally unstable for no reason. |
How do you do this test? Is it a big deal?
No, not at all. This is just a very simple, routine blood test.
This does not require any special preparation. In most cases, you do not need to fast the day before the test. If your doctor orders a blood test to check things like cholesterol and glucose, you can ask to have this test included.
But the most important thing is to tell your doctor about all the medications, vitamins, and supplements you are taking before you have this test, as some medications can affect the results of this test.
How to understand the test report?
The normal range for vitamin B12 levels can vary slightly from one lab to another, but there are some generally accepted values. These are measured in picograms per milliliter (pg/mL).
- Normal level: A value between 190 and 950 (pg/mL).
- Borderline: A value between 200 and 300 (pg/mL). If this is the case, the doctor may need to do some more tests.
- Low: A value less than 200 (pg/mL). This is considered low and requires further testing and treatment.
Sometimes your doctor will also test for another vitamin called folate along with B12, because folate deficiency can cause the same symptoms as B12 deficiency, so it can help pinpoint the exact cause.
If my B12 level is low, what do I do next?
If your report says your B12 level is low, don't worry. There are treatments that can be done for it. But the treatment is determined by your doctor.
- If your B12 levels are healthy: You don't need to do anything special. Continue to eat a balanced diet. Foods like fish, meat, milk, and dairy products are rich in vitamin B12. There are also breakfast cereals that are fortified with vitamin B12.
- If your B12 levels are low: You will need treatment. The type of treatment will depend on the cause of your low B12 levels.
- If the reason is that you are not getting enough B12 from your diet (e.g., vegetarians), your doctor may prescribe vitamin B12 pills (oral supplements) .
- However, if you have a problem absorbing B12 from your stomach (e.g. Pernicious Anemia), taking pills will not help. In such cases, your doctor may recommend vitamin B12 injections .
Vitamin B12 deficiency can cause serious problems with brain function, the nervous system, and many other parts of the body if it persists for a long time. Therefore, it is very important to get tested if you have symptoms. Older people are especially at risk of low B12 levels. Therefore, if your parents or adults in your family are reporting these symptoms, it is very important to talk about their diet and, if necessary, see a doctor and take a B12 supplement.
Take-Home Message
- Feeling tired all the time for no reason, memory loss, and numbness in the limbs can be symptoms of vitamin B12 deficiency.
- The vitamin B12 test is a very simple blood test that does not require fasting.
- Vegetarians, those taking certain medications for gastritis for a long time, and the elderly are at higher risk of B12 deficiency.
- If you find out that your B12 levels are low, don't go on a self-medication spree. Be sure to talk to your doctor to find out the cause and get the most appropriate treatment (pills or injections).











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