Diagnostic Labs Market Analysis and Forecast to 2031: By Lab Type (Hospital Based Labs, Single/Independent Laboratories, Physician Office Labs, Others), Testing Services (Physiological Function Testing, COVID-19 Testing, General & Clinical Testing, Esoteric Testing, Specialized Testing, Non-Invasive Prenatal Testing, Others), Revenue Sources (Healthcare Plan Operators and Insurers, Out-of-Pocket, Public System), and Region