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Vitamin B12
Quest Diagnostics1 test optionFrom $11.68
Vitamin B12
Quest DiagnosticsCatalog information reviewed: August 24, 2026 by the Sunridge Medical clinical team.
What this laboratory test evaluates
Vitamin B12 (Cobalamin)Test
This test measures the level of Vitamin B12 in the body, which is crucial for nerve health and the production of DNA and red blood cells. Low levels of Vitamin B12 can indicate conditions such as pernicious anemia, issues from stomach surgery (total or partial gastrectomy), problems with absorbing nutrients (malabsorption), and certain inherited disorders.
What patients is this test right for?This test may be recommended for individuals showing symptoms of Vitamin B12 deficiency or those at risk due to dietary habits, medical conditions, or surgical history.
Symptoms of Vitamin B12 Deficiency:• Tiredness and weakness
• Memory loss and confusion
• Problems with balance and coordination
• Numbness or tingling in the hands and feet
• Mood changes
What type of sample is required for this test?1 mL serum.
A simple blood draw is needed.
Test Resources:Resources are not available at this time.
Additional test information
B12 is decreased in pernicious anemia, total or partial gastrectomy, malabsorption and certain congenital and biochemical disorders.
Collection and processing
- Sample type: Serum
- Fasting: No
- Estimated laboratory processing: Results should be available in 2 – 5 business days after the sample is collected
How Sunridge uses laboratory information
Sunridge considers the medical question, symptoms, history, medications, prior results, and whether the finding could change care before recommending testing. A laboratory result is not interpreted in isolation and does not establish a diagnosis by itself.
Before requesting this test
Availability, collection requirements, eligibility, and processing estimates can change. Sunridge reviews each request and, when appropriate, creates the order through Fullscript. Follow the current instructions supplied with the approved order.
Common questions about this laboratory test
- What sample does this test require?
- The listed sample type is Serum. Confirm current collection instructions in the approved order.
- Does this test require fasting?
- The current catalog record lists fasting as: No. Follow the instructions supplied with the approved order.
- How long does laboratory processing usually take?
- Results should be available in 2 – 5 business days after the sample is collected. Timing can change after collection or if a laboratory requires additional review.
About this test
Vitamin B12 (Cobalamin)Test
This test measures the level of Vitamin B12 in the body, which is crucial for nerve health and the production of DNA and red blood cells. Low levels of Vitamin B12 can indicate conditions such as pernicious anemia, issues from stomach surgery (total or partial gastrectomy), problems with absorbing nutrients (malabsorption), and certain inherited disorders.
What patients is this test right for?This test may be recommended for individuals showing symptoms of Vitamin B12 deficiency or those at risk due to dietary habits, medical conditions, or surgical history.
Symptoms of Vitamin B12 Deficiency:• Tiredness and weakness
• Memory loss and confusion
• Problems with balance and coordination
• Numbness or tingling in the hands and feet
• Mood changes
What type of sample is required for this test?1 mL serum.
A simple blood draw is needed.
Test Resources:Resources are not available at this time.
Additional details
B12 is decreased in pernicious anemia, total or partial gastrectomy, malabsorption and certain congenital and biochemical disorders.
Highlighted health areas
- Nutrition
- Methylation
- Neurological
Biomarkers and report focus
The exact analytes and report format can change. Confirm the current contents in the Fullscript order before payment.
- Vitamin B12 (Cobalamin)