COVID protection levels

Medical anatomy diagram showing COVID antibody IgG and IgM circulating in human bloodstream with B cells and red blood cells

COVID Antibody Numbers: What 1.4, 100, 2500 Mean

Confused by your COVID antibody test showing 1.4, 100, or 2,500? This guide decodes IgG and IgM levels, explains what your numbers mean for immunity, and when you need a booster.

✓ EDUCATIONAL

Written & edited by: Sameer Patel — Founder & Editor Calculators built on published formulas Educational information — not a substitute for medical advice