More than 1,900 local public health laboratories provide support for city and county public health programs. These laboratories offer onsite testing for child health screening, tuberculosis, refugee screening, food safety, sexually transmitted diseases, and lead poisoning prevention, as well as epidemiologic investigations and environmental monitoring. Local public health laboratories often forward specimens to their state laboratories for tests that are not available locally. Approximately 40% of the local public health laboratories only perform waived tests. Another 40% perform moderate complexity testing, and 20% perform highly complex testing (Association of Public Health Laboratories, 2004).
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