Understanding Methylmalonic Acid, Quantitative, Serum (LC-MS/MS): Normal vs Optimal Ranges

?What is Methylmalonic Acid, Quantitative, Serum (LC-MS/MS)?

Methylmalonic acid (MMA) is an organic acid produced during amino acid and fatty acid metabolism. Elevated serum MMA levels may suggest impaired vitamin B12 (cobalamin) metabolism or functional B12 deficiency. LC-MS/MS provides a highly specific and sensitive quantitative measurement.

!Why It Matters

MMA is a sensitive marker of vitamin B12 status, often more specific than serum B12 alone for detecting functional deficiency. Elevated levels may indicate B12 malabsorption, pernicious anemia, or metabolic disorders, potentially affecting neurological health and energy metabolism.

Reference Ranges

Lab normal ranges may vary between laboratories. Optimal and longevity targets are based on research literature and should be interpreted with your physician.

Symptoms of Imbalance

• Fatigue and weakness
• Numbness or tingling in extremities
• Memory problems or cognitive difficulties
• Elevated homocysteine levels
• Macrocytic anemia symptoms

How to Improve Your Levels

• 1Increase dietary B12 intake through animal products (meat, fish, dairy, eggs)
• 2Consider B12 supplementation or injections if absorption is impaired
• 3Treat underlying gastrointestinal conditions affecting B12 absorption
• 4Address dietary restrictions (vegetarian or vegan diets may require supplementation)
• 5Manage pernicious anemia or autoimmune conditions affecting intrinsic factor
• 6Retest after intervention to monitor B12 repletion

When to Test

When experiencing neurological symptoms, fatigue, or macrocytic anemia; in individuals with gastrointestinal disorders (Crohn's, celiac), strict vegetarian/vegan diets, or pernicious anemia; as part of B12 status evaluation when serum B12 levels are borderline.

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