A Vitamin B12 test measures the level of this essential vitamin in your blood. B12 is crucial for nerve function, DNA synthesis, and red blood cell formation. Deficiency can cause serious and sometimes irreversible neurological damage.
What This Test Measures
Vitamin B12 (Cobalamin):
A water-soluble vitamin found in animal products. B12 is stored in the liver, and deficiency may take years to develop but can cause significant harm.
Reference Range
• Normal: 200-900 pg/mL
• Borderline: 200-300 pg/mL (may have functional deficiency)
• Deficient: Less than 200 pg/mL
Who Should Consider This Test
• Vegetarians and vegans (B12 is only in animal products)
• Adults over 50 (decreased absorption with age)
• Symptoms of deficiency (fatigue, numbness, tingling, memory problems)
• Pernicious anemia or autoimmune conditions
• Gastric bypass or bariatric surgery patients
• Those taking metformin or PPIs (proton pump inhibitors)
• Macrocytic anemia (large red blood cells)
• Chronic digestive disorders
Symptoms of Deficiency
Neurological:
• Numbness and tingling in hands/feet
• Difficulty walking and balance problems
• Memory loss and cognitive changes
• Depression
Blood-Related:
• Fatigue and weakness
• Pale or jaundiced skin
• Shortness of breath
Why Deficiency Occurs
• Inadequate dietary intake (vegans)
• Malabsorption (pernicious anemia, celiac, Crohn’s)
• Reduced stomach acid (aging, PPIs)
• Surgical removal of stomach or intestine
• Certain medications
How It Works
1. Order your test online – no doctor visit required
2. Visit any Quest Diagnostics location nationwide
3. Simple blood draw takes approximately 5 minutes
4. Results delivered to your secure portal within 1-2 business days
Preparation
No fasting required.
Related Tests to Consider
• Folate – Often tested with B12
• B12 & Folate Panel – Combined test
• MMA (Methylmalonic Acid) – More sensitive B12 marker
• CBC – Evaluate for anemia
Why Choose Wittmer Rejuvenation Clinic
At $24, our Vitamin B12 test is affordably priced. We partner with Quest Diagnostics for reliable, CLIA-certified laboratory testing.
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