CLIA stands for Clinical Laboratory Improvement Amendments. Their certification program regulates clinical laboratories in the United States to ensure that they are producing accurate and reliable test results.
The CLIA-Certification program sets national standards for laboratory testing quality and safety. Laboratories that perform testing on human specimens, such as blood, urine, or tissue, must meet certain requirements and pass inspections to receive and maintain their certification. 
The CLIA program applies to all types of laboratory testing, including tests performed in hospitals, clinics, physician offices, and research facilities. The program also requires laboratories to have trained personnel, quality control procedures, and appropriate record-keeping and reporting practices.