2022 NAICS national industry in sector 54 Professional, Scientific, and Technical Services
541380 Testing Laboratories and Services
NAICS 541380 is the US industry code for testing laboratories and services. It covers establishments primarily engaged in performing physical, chemical, and other analytical testing services, such as acoustics or vibration testing, assaying, biological testing (except medical and veterinary), calibration testing, electrical and electronic testing, geotechnical testing, mechanical testing, nondestructive testing, or thermal testing.
- Code
- 541380 (2022 NAICS)
- Title
- Testing Laboratories and Services
- Part of
- Architectural, Engineering, and Related Services
- SBA small business limit
- Average annual receipts up to $19 million
- Closest UK SIC
- 71200 (details)
Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.
Official definition
This industry comprises establishments primarily engaged in performing physical, chemical, and other analytical testing services, such as acoustics or vibration testing, assaying, biological testing (except medical and veterinary), calibration testing, electrical and electronic testing, geotechnical testing, mechanical testing, nondestructive testing, or thermal testing. The testing may occur in a laboratory or on-site.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Laboratory testing for the medical profession are classified in Industry 62151, Medical and Diagnostic Laboratories.
- Veterinary testing services are classified in Industry 541940, Veterinary Services.
- Auto emissions testing are classified in U.S. Industry 811198, All Other Automotive Repair and Maintenance.
Businesses that use this code
Activities listed under 541380
The Census index assigns these 33 activities to this code. If your business matches one, this is your code.
- Acoustics testing laboratories or services
- Assaying services
- Automobile proving and testing grounds
- Biological (except medical, veterinary) testing laboratories or services
- Calibration and certification testing laboratories or services
- Electrical testing laboratories or services
- Electronic testing laboratories or services
- Environmental testing laboratories or services
- Film badge testing (i.e., radiation testing) laboratories or services
- Fire insurance underwriters' laboratories
- Food testing laboratories or services
- Forensic (except medical) laboratories or services
- Geotechnical testing laboratories or services
- Hydrostatic testing laboratories or services
- Industrial testing laboratories or services
- Laboratory testing (except medical, veterinary) services
- Mechanical testing laboratories or services
- Metallurgical testing laboratories or services
- Nondestructive testing laboratories or services
- Pollution testing (except automotive emissions testing) services
- Product testing laboratories or services
- Radiation dosimetry (i.e., radiation testing) laboratories or services
- Radiation testing laboratories or services
- Radiographic testing laboratories or services
- Radiographing welded joints on pipes and fittings
- Radiography inspection services
- Radon testing laboratories or services
- Seed testing laboratories or services
- Soil testing laboratories or services
- Testing laboratories (except medical, veterinary)
- Thermal testing laboratories or services
- Vibration testing laboratories or services
- X-ray inspection services
SBA size standard for 541380
To count as a small business for SBA loans and federal contracts under NAICS 541380, your business (including affiliates) must not exceed $19 million in average annual receipts. Check your business.
Source: SBA table of size standards, effective March 17, 2023.
Closest UK SIC 2007 codes
There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 7120), so treat them as a starting point and check the definition.
Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.
Similar codes to compare
Data last changed November 14, 2026. How this page is built.