Vitamin B12 Deficiency Interpretation

Interpret serum vitamin B12 levels. Deficient: below 200 pg/mL (requires supplementation). Borderline/grey zone: 200-300 pg/mL (check methylmalonic acid and homocysteine for functional deficiency). Normal: above 300 pg/mL. Causes: pernicious anemia, gastric atrophy, strict veganism, metformin use, gastric bypass, H. pylori infection.

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Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How to Use

Enter the values for the scenario you are assessing. Interpret serum vitamin B12 levels. Deficient: below 200 pg/mL (requires supplementation). Borderline/grey zone: 200-300 pg/mL (check methylmalonic acid and homocysteine for functional deficiency). Normal: above 300 pg/mL. Causes: pernicious anemia, gastric atrophy, strict veganism, metformin use, gastric bypass, H. pylori infection. Use the vitamin b12 deficiency result to inform your calculation.

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Frequently Asked Questions