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Vitamin B12 excess
ℹ️ About
- Vitamin B12 is a water-soluble vitamin essential for DNA synthesis, neurological function, and red blood cell production.
- Unlike some vitamins, B12 does not accumulate to toxic levels, even when consumed in excess.
Causes of High B12 Levels
- Excess Replacement: High levels can result from excessive supplementation, particularly via injections or high-dose oral supplements.
- Renal Disease: Impaired kidney function reduces the excretion of B12, leading to elevated levels in the blood.
- Myeloproliferative Disorders: Conditions such as polycythaemia vera, chronic myeloid leukaemia (CML), and hypereosinophilic syndrome can increase circulating B12 due to a higher number of B12-containing red and white blood cells.
- Liver Disease: Liver damage or dysfunction (e.g., cirrhosis, hepatitis) can cause the release of stored cobalamin into the bloodstream, resulting in elevated levels.
💊 Management
- Elevated B12 levels should prompt an evaluation for underlying conditions, such as myeloproliferative disorders, liver disease, or renal dysfunction.
- Refer the patient to the appropriate specialty (e.g., haematology, hepatology, nephrology) for further investigation and management based on the suspected underlying cause.
- Monitor and manage any associated clinical symptoms or conditions as indicated.