Furthermore, lysozyme concentrations are lower in urineand serum samples from normal human adults (approximately 0.18 and1.7 μg/mL, respectively). It isused as a biomarker in the diagnosis of various diseases such as Alzheimer’s,breast cancer, and rheumatoid arthritis. Increased lysozyme levels are also nonspecific indicators for diseasessuch as leukemia and meningitis. This evidence concerns the gene LYZ and rheumatoid arthritis.