GLP, GMP, and CLIA

Why it matters

Lab job postings are full of acronyms: "GMPGood Manufacturing Practice: rules that make every manufactured batch of a drug, biologic or device safe and consistent. experience preferred", "CLIAThe Clinical Laboratory Improvement Amendments: US rules, administered by CMS, for labs testing human specimens for patient care.-certified laboratory", "GLPGood Laboratory Practice: rules for the integrity of non-clinical safety studies submitted to regulators (FDA 21 CFR Part 58 in the US). study support". They name the rule sets that decide how a lab must work, how it is inspected and what its records must show. Knowing which rules apply to which lab tells you what a job will be like and what training you will need. This lesson covers the US framework at awareness level; the regulations themselves are long, change over time, and are taught in detail by employers.

GLP: Good Laboratory Practice

What it covers: non-clinical laboratory studies (often animal or lab studies of toxicity and safety) whose results are submitted to regulators to support approval of products such as drugs, medical devices, food additives and pesticides.

Who sets it: in the US, the FDA's GLP regulations are in 21 CFR Part 58, and the EPA has its own GLP rules for pesticides and chemicals. Internationally, the OECD Principles of GLP play the same role.

What it requires, in outline:

• A named study director responsible for each study.
• An independent quality assurance unit that audits studies.
• Written protocols and SOPs, followed and documented.
• Calibrated, maintained equipment and characterised test materials.
• Archived raw data and specimens so a study can be reconstructed years later.

GLP is about the integrity of a study. It does not tell scientists which experiments to run.

GMP: Good Manufacturing Practice

What it covers: the manufacture, testing and release of products such as drugs, biologics and medical devices, so every batch is safe and consistent. You will often see "cGMP" (current GMP).

Who sets it: FDA regulations, including 21 CFR Parts 210 and 211 for drugs, additional parts for biologics, and quality system rules for medical devices. International guidance comes from ICH and other bodies.

What it requires, in outline:

• A quality unit with authority to approve or reject materials and batches.
• Batch records documenting every step of making each batch.
• Validated processes, equipment, methods and cleaning.
• Change controlThe GMP rule that no change is made to a process without review and approval.: no change to a process without review and approval.
• Deviations investigated and CAPACorrective and preventive action: the steps taken after a deviation so the problem does not recur. (corrective and preventive action) to stop them recurring.
• Training records for every employee.

A biological technician at a vaccine plant or a QC analyst at a pharma company lives in GMP every day.

CLIA: Clinical Laboratory Improvement Amendments

What it covers: US laboratories that test human specimens to provide information for the diagnosis, prevention or treatment of disease, or the assessment of health. Hospital labs, reference labs and doctor's office labs fall under CLIA. Research labs that do not report patient-specific results for patient care are generally not covered.

Who runs it: CMS (Centers for Medicare & Medicaid Services) administers CLIA; FDA categorises tests by complexity; CDC provides scientific support. Labs hold a CLIA certificate, and many are accredited by an approved organisation such as CAP (College of American Pathologists).

What it requires, in outline:

• Tests classified as waived, moderate complexity or high complexity, with stricter rules as complexity rises.
• Quality control for every test run and proficiency testingBlind samples from an outside program that a clinical lab tests to prove its results are accurate. (blind samples from an outside program).
• Personnel qualifications for directors, supervisors and testing staff, which is one reason clinical employers require MLS(ASCP)-level training.
• Inspections, and corrective action when problems are found.

Which rules apply? A worked example

Official sources for detail: FDA (fda.gov), CMS CLIA pages (cms.gov) and the CDC's CLIA resources (cdc.gov). Regulations and guidance change; read the current versions there. Checked on 2026-10-23.

Common mistakes

• Using "GLP" to mean "good lab habits". In regulated work, GLP is a specific legal framework for safety studies.
• Assuming research labs follow GMP. Most academic research does not, which is why industry trains new hires in GMP.
• Thinking CLIA is only about equipment. It also covers staff qualifications, QC and proficiency testing.

Quick recap

• GLP: integrity of non-clinical safety studies submitted to regulators (21 CFR 58).
• GMP: consistent, safe manufacturing and batch release (21 CFR 210/211 for drugs and more).
• CLIA: quality of patient testing on human specimens, run by CMS with FDA and CDC.
• Each requires written procedures, trained staff and records an inspector can check.