NAICS 621511

Medical Laboratories

Key Figures

Establishments
16,635
Census CBP · 2023
Employment
232,333
Census CBP · 2023
Market size
$56.1B
Census Economic Census · 2022

Figures are published for NAICS 621511 directly.

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Official definition

This U.S. industry comprises establishments known as medical laboratories primarily engaged in providing analytic or diagnostic services, including body fluid analysis, generally to the medical profession or to the patient on referral from a health practitioner.

Source: US Census Bureau, 2017 NAICS Definitions. Public domain.

Illustrative examples

  • Blood analysis laboratories
  • Medical pathology laboratories
  • Medical bacteriological laboratories
  • Medical testing laboratories
  • Medical forensic laboratories

Which code does this activity belong in?

Medical laboratories provide analytic and diagnostic services based on body fluid analysis, such as blood testing and bacteriological examination. The boundary between medical laboratories and diagnostic imaging centers lies in the type of analysis performed: medical laboratories conduct chemical, biological, and pathological analysis of body samples, whereas diagnostic imaging centers produce visual images of patients using technologies like X-ray, CT scan, and MRI. Establishments using imaging equipment to generate diagnostic pictures are classified in diagnostic imaging centers, not medical laboratories.

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Where this sits

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