Vitamin B12 (Serum) with Quantitative Measurement

Why This Test Matters

Vitamin B12 is essential for red blood cell production, nerve function, and DNA synthesis. Your body absorbs it primarily from food, and deficiencies can develop over time if intake is insufficient or absorption is impaired. This test helps identify whether your levels are within a healthy range or if further investigation is needed.

What to Expect Before the Test

No special preparation is needed for this test. You may have a blood sample drawn from a vein in your arm by a healthcare professional. If you’re on a vitamin B12 supplement or have recent vitamin B12-rich foods, your provider may advise timing your intake around the test to avoid interference.

Common Causes of Low or High Levels

Low vitamin B12 levels can result from dietary deficiencies, conditions affecting absorption (like pernicious anemia or celiac disease), chronic illnesses, or certain medications. High levels are less common but may occur with long-term vitamin B12 supplements or rare genetic disorders.

Symptoms to Watch For

Symptoms of vitamin B12 deficiency may include fatigue, weakness, numbness or tingling in hands/feet, balance issues, memory problems, or unusual mood changes. If you experience these symptoms, discuss them with your doctor, as early diagnosis and treatment can prevent complications.