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Active B12

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Active B12

Accredited Facility E-report Qualified Specialists

This test is done to measure holotranscobalamin, the fraction of vitamin B12 that is bound to transcobalamin and available for cellular uptake. It reflects functional vitamin B12 status more accurately than total B12 in some cases and can help detect early deficiency before clinical symptoms or anemia develop.

  • If vitamin B12 deficiency is suspected.
  • If there are symptoms like fatigue, numbness, or tingling.
  • If total B12 levels are borderline or unclear.
  • If a healthcare provider is evaluating neurological or hematological symptoms.
  • No fasting is required.
  • No special preparation is usually needed.
  • Inform your healthcare provider about B12 supplements or injections.
  • Follow any instructions provided by the laboratory or healthcare provider.
    • Active B12
    No labs currently offering this test.