CLIA certification is a federal requirement for any facility in the United States that performs laboratory testing on human specimens. Established by the Clinical Laboratory Improvement Amendments of 1988, it ensures that labs producing results used in medical decisions meet minimum quality standards. If a facility runs even one test on a human sample (blood, tissue, or body fluid) to assess health or diagnose, prevent, or treat disease, it is legally considered a laboratory under CLIA and must hold a certificate.
Who Needs CLIA Certification
The scope is broad. Hospitals, independent labs, physician offices, nursing homes, pharmacies, and clinics that perform any human diagnostic testing all fall under CLIA. The law doesn’t distinguish by size. A small doctor’s office running a rapid strep test is subject to the same framework as a large reference laboratory processing thousands of samples a day.
A few categories are exempt. Labs that only perform forensic testing (such as criminal investigations) do not need certification. Research laboratories that test human specimens but never report patient-specific results for clinical use are also excluded. Drug-testing labs certified by the Substance Abuse and Mental Health Services Administration (SAMHSA) are exempt for that drug testing, though any other clinical tests they perform still require a CLIA certificate.
Two states, Washington and New York, operate their own laboratory oversight programs that CMS has deemed equivalent to federal CLIA standards. Labs in those states follow their state’s process instead, though the overall requirements are comparable.
The Five Types of CLIA Certificates
Not every lab needs the same level of oversight. CLIA sorts certificates based on the complexity of testing a lab performs.
- Certificate of Waiver: Covers only “waived” tests, which are simple, low-risk procedures with minimal chance of error. Common examples include basic glucose monitoring, rapid flu and COVID tests, urine dipsticks, and some cholesterol screenings. This is the most common certificate type, especially for small physician offices and pharmacies.
- Certificate for Provider-Performed Microscopy (PPM): Allows a physician, midlevel practitioner, or dentist to perform certain microscopy procedures (like wet mounts or KOH preparations) in addition to waived tests. Only the provider can perform the microscopy portion.
- Certificate of Registration: A temporary certificate that allows a lab to begin performing moderate or high complexity testing while it awaits a full compliance inspection.
- Certificate of Compliance: Issued after a lab passes an on-site inspection confirming it meets all applicable CLIA regulations for the complexity of testing it performs.
- Certificate of Accreditation: Issued when a lab earns accreditation from a CMS-approved organization (such as the College of American Pathologists or The Joint Commission) instead of undergoing a direct government survey.
When applying, you select the certificate that matches the highest complexity level of testing your lab performs. If you run even one high-complexity test alongside dozens of waived tests, you need a certificate that covers high complexity.
How Test Complexity Works
The FDA categorizes every laboratory test into one of three complexity levels: waived, moderate, or high. This classification drives nearly everything about CLIA requirements, from which certificate you need to how your lab is staffed and inspected.
Waived tests are the simplest. They use straightforward methods and carry little risk of harm if performed incorrectly. Labs holding only a Certificate of Waiver face the lightest regulatory burden: no routine inspections, no proficiency testing requirements, and minimal personnel qualifications. That said, even waived-test labs must follow manufacturer instructions for each test.
Moderate and high complexity tests require progressively more oversight. These include things like complete blood counts, bacterial cultures, Pap smears, and specialized chemistry panels. Labs performing these tests must meet staffing requirements, participate in proficiency testing, and undergo periodic inspections.
Proficiency Testing Requirements
Labs performing non-waived tests must enroll in a proficiency testing (PT) program approved by the Department of Health and Human Services. A PT program sends standardized samples to your lab, typically three times per year, and your lab processes them exactly as it would process real patient specimens: same equipment, same staff, same procedures. The program then grades your results against established criteria.
Failing the same test in two consecutive rounds, or two out of three rounds, counts as unsuccessful performance. That can trigger additional oversight, follow-up surveys, or sanctions. Labs are also strictly prohibited from sending PT samples to another lab for analysis, even if they routinely send patient specimens out for reference testing. PT records must be kept for at least two years.
Personnel and Laboratory Director Requirements
Every CLIA-certified lab must designate a laboratory director, and the qualifications scale with test complexity. For waived testing, the requirements are minimal. For moderate complexity testing, the director must hold at least a bachelor’s degree in a laboratory science field along with two years of lab training and two years of supervisory experience, plus 20 hours of continuing education in laboratory practice. Alternatively, a physician with board certification in pathology automatically qualifies, as does any licensed physician with at least one year of supervisory experience in non-waived testing.
High complexity testing demands even more rigorous credentials. The intent is straightforward: the more complex and consequential the testing, the more qualified the person overseeing it needs to be.
How to Apply
The application process centers on a single form: the CMS-116. You download the fillable PDF, complete all sections with current information, and submit it to your state’s designated agency. The facility address must be the physical location where testing occurs, not a P.O. box.
For any certificate beyond a Certificate of Waiver, you also need to submit documentation proving your laboratory director meets the required qualifications. This includes diplomas or transcripts, board certifications, state licensure (if applicable), continuing education records, and documentation of laboratory experience. Applicants who attended schools outside the U.S. must have their credentials evaluated for equivalency.
After your state agency processes the application, you’ll receive a fee coupon by email that includes your unique 10-character CLIA identification number. You pay the fee through pay.gov using a bank account, debit card, or credit card. Once payment clears, you receive your certificate electronically. Labs applying for a Certificate of Waiver or PPM can generally begin testing once they have their certificate in hand. Labs applying for moderate or high complexity testing receive a Certificate of Registration first, which allows testing to begin while awaiting a full compliance inspection.
What CLIA Certification Costs
CLIA fees are billed every two years and vary by certificate type and testing volume. As of the 2024 fee schedule, the costs break down like this:
- Certificate of Registration: $123 biennially, with no survey fee
- Certificate of Waiver: $248 biennially, with no survey fee
- PPM Certificate: $297 biennially, with no survey fee
- Low-volume labs (2,000 or fewer tests): $223 certificate fee plus an average $446 survey fee
- Mid-volume labs (2,001 to 25,000 tests): $223 to $654 certificate fee, with survey fees ranging from roughly $1,477 to $2,894 depending on the number of specialties
- High-volume labs (over 1 million tests): Up to $11,801 in certificate fees plus approximately $5,459 in survey fees
Follow-up surveys, complaint investigations, and proficiency testing failures generate additional charges billed at the state agency’s hourly rate, which averaged $111.81 per hour in 2024 (including travel time). For most small practices running waived tests, the total cost is modest. Large reference laboratories face significantly higher fees reflecting the complexity and scale of their operations.
What Happens During an Inspection
Labs performing moderate or high complexity testing are subject to periodic on-site surveys, typically every two years. Inspectors verify that the lab follows its own written procedures, that equipment is properly maintained and calibrated, that staff qualifications are documented, and that quality control and proficiency testing records are in order. If the lab passes, it receives a Certificate of Compliance (or maintains its Certificate of Accreditation if accredited through an approved organization).
Labs that don’t pass may face a range of consequences: directed plans of correction, suspension of testing for specific analytes, civil monetary penalties, or in serious cases, revocation of the CLIA certificate entirely. Losing your certificate means you cannot legally perform laboratory testing, and Medicare and Medicaid will not reimburse for any tests performed without one.