Vitamin B12 — lab reference
In the reference guide<150 supports deficiency; 150-400 is often treated as borderline and may warrant MMA/homocysteine review.
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What’s searchable?<150 supports deficiency; 150-400 is often treated as borderline and may warrant MMA/homocysteine review.
Fasting and supplement abstention improve interpretability.
Recent supplementation can elevate; very high values may be clinically relevant.
Fasting, liver function, inflammation, and carrier proteins matter.
Interpret relative to lipids when appropriate; assay-specific.
Highly preanalytic-sensitive. Fasting, processing, and recent intake matter.
Consider altitude and iron/B12/folate status. Pregnancy requires trimester-specific ranges.
Interpret with kidney function, calcium, vitamin D, and PTH.
More specific for cellular B12 deficiency; kidney impairment can elevate.
No universal wellness target. Interpret with B12, folate, B6, kidney, thyroid, genetics, and medications.
Not a routine vitamin D status test. Interpret with calcium, phosphorus, kidney function, and PTH.
Reagent-specific. Interpret with INR, liver function, vitamin K, and anticoagulants.
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