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Also reported in: pmol/L, ng/L
Your B12 level is within the normal range, indicating adequate B12 for nerve function, red blood cell production, and DNA synthesis.
At this very low B12 level, your nervous system is under serious threat. B12 maintains the myelin sheath — the protective coating around nerve fibers. Without it, nerves deteriorate, causing numbness, tingling, balance problems, cognitive decline, and potentially irreversible neurological damage.
Seek urgent medical care. B12 injections are needed to bypass any absorption issues. Oral supplements alone may not be sufficient at this level. Neurological damage from B12 deficiency can become permanent if not treated promptly.
Vitamin B12: {{value}} {{unit}} — very low (ref: {{low}}–{{high}})Low B12 may contribute to megaloblastic anemia (large, poorly functioning red cells), fatigue, brain fog, depression, tingling in hands and feet, and balance issues. Common may contribute to include vegan/vegetarian diet (B12 is only in animal products), use of metformin or proton pump inhibitors, pernicious anemia, and gut malabsorption.
Start B12 supplementation (sublingual methylcobalamin 1,000–2,000 mcg daily is well absorbed even without intrinsic factor). If pernicious anemia is suspected, you may need B12 injections. Retest in 3 months.
Vitamin B12: {{value}} {{unit}} — below reference range (ref: {{low}}–{{high}})B12 in the 200–400 pg/mL range is technically normal by lab standards but below optimal. Many clinicians consider this 'low-normal' — functional B12 deficiency can occur even within the reference range, particularly in older adults. Subtle cognitive changes, mild fatigue, and slightly elevated homocysteine may be present.
Consider a B12 supplement (sublingual methylcobalamin). Check methylmalonic acid (MMA) and homocysteine for tissue-level B12 status. Retest in 3 months.
Vitamin B12: {{value}} {{unit}} — borderline low (200–400 pg/mL)Your B12 level is within the normal range, indicating adequate B12 for nerve function, red blood cell production, and DNA synthesis.
No action needed. If vegetarian or vegan, continue B12 supplementation to maintain this level.
Vitamin B12: {{value}} {{unit}} — within reference rangeB12 in the upper half of the reference range (400+ pg/mL) provides optimal support for neurological function, mood regulation, red blood cell production, and DNA methylation.
Excellent result. If plant-based, keep up your B12 supplementation routine.
Vitamin B12: {{value}} {{unit}} — optimal (400–900 pg/mL)Mildly elevated B12 is almost always due to recent supplementation or B12 injections — the body excretes excess B12 in urine, so toxicity from oral B12 is very rare.
No immediate concern. If taking high-dose B12 injections, this is expected. Discuss with your doctor if not supplementing.
Vitamin B12: {{value}} {{unit}} — borderline highHigh B12 in the absence of supplementation can indicate liver disease (which releases stored B12), certain blood cancers (myeloproliferative disorders), or chronic kidney disease. When unexplained, it warrants investigation.
If not taking B12 supplements, see your doctor to investigate the cause. Liver function tests and a CBC are a good starting point.
Vitamin B12: {{value}} {{unit}} — above reference range (ref: {{low}}–{{high}})Very high B12 not explained by supplementation is associated with serious conditions including hepatocellular carcinoma, liver disease, and myeloproliferative cancers like CML or PV. The liver releases stored B12 when damaged or during abnormal blood cell proliferation.
Seek urgent medical evaluation if not supplementing. Liver and blood cancer workup is needed.
Vitamin B12: {{value}} {{unit}} — very high (ref: {{low}}–{{high}})Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.