LYZ and infectious meningitis: 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.