2022 NAICS national industry in sector 31-33 Manufacturing
325413 In-Vitro Diagnostic Substance Manufacturing
NAICS 325413 is the US industry code for in-vitro diagnostic substance manufacturing. This U.S.
- Code
- 325413 (2022 NAICS)
- Title
- In-Vitro Diagnostic Substance Manufacturing
- Part of
- Pharmaceutical and Medicine Manufacturing
- SBA small business limit
- Up to 1,250 employees
- Closest UK SIC
- 20200 (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 U.S. industry comprises establishments primarily engaged in manufacturing in-vitro (i.e., not taken internally) diagnostic substances, such as chemical, biological, or radioactive substances. The substances are used for diagnostic tests that are performed in test tubes, petri dishes, machines, and other diagnostic test-type devices.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Establishments primarily engaged in manufacturing in-vivo diagnostic substances are classified in U.S. Industry 325412, Pharmaceutical Preparation Manufacturing.
Activities listed under 325413
The Census index assigns these 13 activities to this code. If your business matches one, this is your code.
- Blood derivative in-vitro diagnostic substances manufacturing
- Blood glucose test kits manufacturing
- Coagulation in-vitro diagnostic substances manufacturing
- Cytology and histology in-vitro diagnostic substances manufacturing
- Diagnostic substances, in-vitro, manufacturing
- Enzyme and isoenzyme in-vitro diagnostic substances manufacturing
- Hematology in-vitro diagnostic substances manufacturing
- HIV test kits manufacturing
- Hormone in-vitro diagnostic substances manufacturing
- In-vitro diagnostic substances manufacturing
- Microbiology, virology, and serology in-vitro diagnostic substances manufacturing
- Pregnancy test kits manufacturing
- Viral in-vitro diagnostic test substances manufacturing
SBA size standard for 325413
To count as a small business for SBA loans and federal contracts under NAICS 325413, your business (including affiliates) must not exceed 1,250 employees. 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: 2029, 2100), 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.