Blood testsVitamins and iron

Vitamin B12.

Measures vitamin B12 in the blood.

  • Markers1
  • SampleBlood draw
  • FastingNone
  • Draw timeAny time
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What it measures.

In plain English. This describes what a lab measures; it cannot tell you what your own result means.

  • Vitamin B12B12

    A vitamin the body needs to make red blood cells and keep nerves working. It comes from food or supplements.

How to prepare.

  1. No fasting needed. Eat and drink as usual.

Often taken with it.

  • Vitamins and iron2 markers

    Vitamin B12 and folate

    Measures two B vitamins the body needs to make new cells.

    • No fasting

    B12, Folate

  • Vitamins and iron3 markers

    Vitamin D, 25 hydroxy

    Measures the main circulating form of vitamin D, with D2 and D3.

    • Fasting preferred, not required

    Vitamin D

  • Vitamins and iron1 marker

    Ferritin

    Measures ferritin, which reflects the body’s iron stores.

    • No fasting

    Ferritin

The waitlist makes no eligibility, diagnosis, treatment, prescribing, or medication access decisions.

Clinical questions, eligibility, and care decisions happen later with a licensed provider, outside this form and only where legally available.