621511 — Medical Laboratories
Description
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 (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Illustrative Examples
- Blood analysis laboratories
- Medical pathology laboratories
- Medical bacteriological laboratories
- Medical testing laboratories
- Medical forensic laboratories
Exclusions & Cross-References
- Establishments known as dental laboratories primarily engaged in making dentures, artificial teeth, and
- orthodontic appliances to prescription are classified in U.S. Industry 339116, Dental Laboratories;
- Establishments known as optical laboratories primarily engaged in grinding lenses to prescription are
- classified in U.S. Industry 339115, Ophthalmic Goods Manufacturing;
- Establishments known as orthopedic laboratories primarily engaged in making orthopedic or prosthetic
- appliances to prescription are classified in U.S. Industry 339113, Surgical Appliance and Supplies
- Manufacturing; and
- Establishments primarily engaged in providing health screening or physical fitness evaluation services
- (except by offices of health practitioners) are classified in U.S. Industry 621999, All Other Miscellaneous
- Ambulatory Health Care Services.
Overview Facts
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 8071 - Medical Laboratories (via SIC1987:8071→NAICS1997:621511→2002:621511→2007:621511→2012:621511→2017:621511→2022:621511)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC Q301 — Reference Laboratory Testing
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 621511 valid in 2022? ▾
Yes, 621511 is a valid 6-digit 2022 NAICS national industry code representing 'Medical Laboratories' under Sector 62 in the official classification index.
What is the SBA size standard for NAICS code 621511? ▾
The Small Business Administration (SBA) has established a small business size standard of $41,500,000 for NAICS code 621511 (Medical Laboratories), calculated based on receipts.
What is the legacy SIC equivalent for NAICS 621511? ▾
According to official Census Bureau concordance tables, NAICS code 621511 (Medical Laboratories) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 8071 - Medical Laboratories.
Related Pages & Tools
Further regulatory reference links for NAICS code 621511:
- Sector 62 Directory Hub — List of related industries in the Health Care and Social Assistance sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- NAICS 621511 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Medical Laboratories).
- IRS PBA Code for Medical Lab — Principal Business Activity tax reporting details.
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.