Medical Laboratories

Health Care and Social Assistance › Ambulatory Health Care Services › Medical and Diagnostic Laboratories

SBA Size Standard

$41.5M average annual receipts

Revenue-Based Verify at SBA.gov →

NAICS Code Hierarchy

Sector

Health Care and Social Assistance

621

Subsector

Ambulatory Health Care Services

6215

Industry Group

Medical and Diagnostic Laboratories

621511

National Industry (This Code)

Medical Laboratories

Official NAICS Description

Source: U.S. Census Bureau 2022 NAICS

📘 Source: U.S. Census Bureau — 2022 NAICS Manual

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. Illustrative Examples: Blood analysis laboratories Medical pathology laboratories Medical bacteriological laboratories Medical testing laboratories Medical forensic laboratories

✓ Small Business Eligibility at a Glance

Based on SBA Table of Small Business Size Standards (2024)

Size Standard

$41.5M average annual receipts

Measurement Period

3-year average

Standard Type

Revenue-Based

Applies To

All contracts under NAICS 621511

Set-Aside Programs

8(a), WOSB, HUBZone, SDVOSB

Certification Required

No (self-certify in SAM.gov)

Size standards are set by the SBA and reviewed periodically. Always verify at SBA.gov before bidding.

Cross-References

The following activities are classified elsewhere in the NAICS system:

→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.

How to Use NAICS 621511 in SAM.gov

NAICS code 621511 — Medical Laboratories — is used in SAM.gov to identify businesses whose primary activity falls within this classification. When you add this code to your SAM.gov entity registration, contracting officers searching for vendors in the Medical and Diagnostic Laboratories space will be able to find your business.

If this code represents your primary business activity, designate it as your primary NAICS code. Your primary NAICS code determines your size standard for any contract solicited under this code. With a size standard of $41.5M average annual receipts, your business must be at or below this threshold to qualify as a small business for set-aside contracts under NAICS 621511.

Frequently Asked Questions

What is NAICS code 621511?

NAICS code 621511 is 'Medical Laboratories', classified under the Health Care and Social Assistance sector (NAICS 62). 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 profes

What is the SBA small business size standard for NAICS code 621511?

The SBA defines a small business under NAICS code 621511 (Medical Laboratories) as one with $41.5M average annual receipts. This size standard determines eligibility for small business set-aside contracts, 8(a), HUBZone, WOSB, and SDVOSB programs in SAM.gov.

How do I register NAICS code 621511 in SAM.gov?

To register NAICS code 621511 in SAM.gov: (1) Log in at sam.gov, (2) Navigate to your Entity Registration, (3) Go to the Assertions section, (4) Add 621511 (Medical Laboratories) to your NAICS code list. You may designate one code as your Primary NAICS code.