Diagnosing Pernicious Anemia with Laboratory Tests

Initial Laboratory Findings

• Hemoglobin levels are typically <12 g/dL in women or <13 g/dL in men, with elevated MCV >100 fL, indicating macrocytic anemia, according to Praxis Medical Insights 1
• Low reticulocyte count and elevated red cell distribution width (RDW) are also common findings in pernicious anemia, as reported by Praxis Medical Insights 1, 2

Confirming B12 Deficiency and Establishing Pernicious Anemia

• Methylmalonic acid (MMA) is a sensitive marker for B12 deficiency, often elevated early in the condition, as noted by Praxis Medical Insights 3
• Homocysteine levels are also elevated in B12 deficiency, providing additional evidence for the condition, according to Praxis Medical Insights 3

Interpreting Laboratory Results

• Inflammatory conditions do not significantly affect the interpretation of B12 testing, unlike iron studies, as stated in the Journal of Crohn's and Colitis 4