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Doctor insights on: B12 Test

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A blood test showed that i'm B12 deficient. Serum B12 level of 186 pg/ml, should I take vitamin B12 supplements?

A blood test showed that i'm B12 deficient. Serum B12 level of 186 pg/ml, should I take vitamin B12 supplements?

B12: this low will likely cause dementia, spinal cord degeneration and peripheral neuropathy. Keep your level above 550 for the rest of your life. Recovery takes about a year in a young person. I suggest you take liquid sublingual weekly for 3 months then bi weekly thereafter. Its important to check a level after you cut back to twice a month. Use 1 1/2 dropper and hold it under the tongue for 30 sec. ...Read more

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Dr. Randy Baker
972 doctors shared insights

Vitamin B12 (Definition)

Vitamin B12 is a vitamin which is a kind of nutritional agent ...Read more


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Where would I get a B12 test?

Where would I get a B12 test?

B12 test: Testing for vitamin B12 deficiency can be done in any doctor's office. ...Read more

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What is the definition or description of: B12 test?

What is the definition or description of: B12 test?

B12 test: B12 is tested in a blood sample drawn from your arm. The test will report as a concentration of B12 present in blood. Normal values range from 200 to 2000 pg/ml. Even normal values, though, may associate with deficiency of B12. If concern exists, your doctor will order homocysteine blood levels. If homocysteine blood levels are elevated, then a functional B12 deficiency exists that requires B12 Rx ...Read more

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Do we ha ve to stop taking vit B12 supplement before taking a vit B12 test? If so how many days before?

Do we ha ve to stop taking vit B12 supplement before taking a vit B12 test? If so how many days before?

No: If you have been taking B12 and previous tests were normal, you probably have a year's worth of B12 in storage. If the purpose of the test is to see if you have normal blood levels of b12, you do not need to stop the oral intake of b12. ...Read more

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Does taking b12 a week before an intrinsic factor blood test cause a false reading? Would it affect a b12 test too?

Does taking b12 a week before an intrinsic factor blood test cause a false reading? Would it affect a b12 test too?

Depends on the test: The test for intrinsic factor is usually antibody to intrinsic factor and that would not be affected. If the B12 test is measuring the blood level of the vitamin, then that would be affected and yield a higher reading than the baseline, without the B 12 supplement. ...Read more

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My vitamin B12 test come back at 223 is this to low?

Depends: It depends on the references in the lab in which it was performed. However, this value is usually borderline low. In this case, we check another blood test for homocysteine and methylmalonic acid levels, which should be elevated in vitamin B12 deficiency. If confirmed, further testing is needed and should be treated. Good luck.. ...Read more