Blog — preventive health testing

Learn the key differences between EIA, ECLIA, and mass spectrometry hormone testing methods, and discover why ZRT Laboratory’s long-standing use of LC-MS, GC-MS, and ICP-MS delivers gold-standard accuracy for advanced hormone analysis.

Learn the science of saliva testing, how it measures bioavailable hormones, and why it’s trusted by patients, clinicians, and wellness experts.

A fasting insulin test helps identify early signs of insulin resistance, often before blood sugar levels become abnormal. By measuring insulin after an overnight fast, it provides valuable insight into metabolic health, energy balance, and long-term risks such as diabetes and heart disease. Easy at-home testing with a simple finger-prick sample allows you to understand your insulin levels clearly and take proactive steps to protect your health.