# Vitamin B12 Deficiency Cascade

> This test measures the amount of Vitamin B12 in your blood and may automatically check a substance called methylmalonic acid (MMA) if your initial results are unclear. It helps determine if your body has enough B12 to support healthy nerve and blood cells, which is important if you are experiencing fatigue or tingling in your hands and feet. By looking at both markers, this test helps distinguish between a true vitamin deficiency and a normal result when standard tests are borderline. While it identifies low levels, it does not diagnose the specific underlying cause of the deficiency, such as diet or an absorption problem, without further evaluation.

- Labcorp code: 141503
- Category: [Nutrients](https://app.picardo.health/labs/tests/nutrients.md)
- Price: shown at checkout, before payment.
- Blood draw: free at a Labcorp location, or $75.00 at home.
- Order link: https://app.picardo.health/labs/order?tests=141503&ref=assistant

## About ordering

A licensed physician reviews every order before any test is run, and results arrive in the person's Picardo account. Ordering is open to adults 18 and over in the US, except New York, New Jersey, Rhode Island, Pennsylvania, Maryland, Massachusetts, Hawaii and Maine. General health information, not medical advice.