Quick Answer: What Blood Test For Vitamin B12 Level?

Is B12 checked in routine blood work?

This is why it’s important for your symptoms to be taken into account when a diagnosis is made. A particular drawback of testing vitamin B12 levels is that the current widely used blood test only measures the total amount of vitamin B12 in your blood.

How do you test for vitamin B12 deficiency?

Your doctor will do a physical exam and might order one or more of these tests:

  1. Complete blood count. This test checks the size and number of your red blood cells.
  2. Vitamin B12 level.
  3. Intrinsic factor antibodies.
  4. Schilling test.
  5. Methylmalonic acid level (MMA).

Can a CBC detect vitamin B12 deficiency?

Macrocytic/megaloblastic anemia and large red blood cells are associated with a vitamin B12 or folate deficiency and are often initially detected during a routine CBC. In addition, abnormal physical characteristics of some of the cells are identified that are consistent with these deficiencies.

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What should your B12 levels be?

Understanding the Results

But a normal level of vitamin B12 in your bloodstream is generally between 190 and 950 picograms per milliliter (pg/mL). Between 200 to 300 pg/mL is considered borderline and your doctor may do more testing. Below 200 pg/mL is low and more testing is needed.

Why is my B12 blood test high?

An abnormally high vitamin B-12 status can be an early sign of liver disease, diabetes, or certain types of leukemia. A doctor may use the results of a vitamin B-12 test to help form their diagnosis.

Is vitamin B12 tested in CBC?

B12 and folate levels may be ordered when a complete blood count (CBC) and/or blood smear, done as part of a health checkup or an evaluation for anemia, shows a low red blood cell (RBC) count, decreased hemoglobin and hematocrit, and the presence of large RBCs.

How long does B12 deficiency take to correct?

Recovery from vitamin B12 deficiency takes time and you may not experience any improvement during the first few months of treatment. Improvement may be gradual and may continue for up to six to 12 months.

Should I be worried if my B12 is high?

Though daily high doses of B12 are unlikely to cause harm in most people, extremely high doses should be avoided unless prescribed by a healthcare professional. If you think you may be deficient in B12, speak with your doctor, who can recommend an appropriate treatment based on your level of deficiency.

What happens when your vitamin B12 is low?

Not having enough B12 can lead to anemia, which means your body does not have enough red blood cells to do the job. This can make you feel weak and tired. Vitamin B12 deficiency can cause damage to your nerves and can affect memory and thinking.

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What are the neurological symptoms of B12 deficiency?

A lack of vitamin B12 can cause neurological problems, which affect your nervous system, such as:

  • vision problems.
  • memory loss.
  • pins and needles (paraesthesia)
  • loss of physical co-ordination (ataxia), which can affect your whole body and cause difficulty speaking or walking.

Does CBC show vitamin deficiency?

The results of a CBC can reveal a number of health conditions to your doctor, from anemia and some types of cancer to vitamin and mineral deficiencies.

Can a CBC detect vitamin D deficiency?

A CBC also helps diagnose conditions such as anemia, infection, and many other disorders. The Vitamin D 25-Hydroxy Blood Test is often ordered for individuals that have symptoms of vitamin D deficiency. It may also be ordered before an individual begins osteoporosis drug therapy.

Is 500 a good B12 level?

The vitamin B12 standard reference range is 200–700 pg/ml whereas the proposed optimal range is 500–1300 pg/ml [10]. Higher vitamin B12 ranges have been associated with increased cognitive function, and reflexes, decreased brain atrophy, confusion, weakness and depression [10].

Can you take too much vitamin B12?

Since B12 is a water-soluble vitamin, it’s generally considered safe, even at high doses. No Tolerable Upper Intake Level (UL) has been established for B12, due to its low level of toxicity. UL refers to the maximum daily dose of a vitamin unlikely to cause adverse side effects in the general population.

How long does it take for B12 blood test results?

A response usually is seen within 48 to 72 hours, with brisk production of new red blood cells. Once B12 reserves reach normal levels, injections of vitamin B12 will be needed every one to three months to prevent symptoms from returning.

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