NAICS Code 621511: Medical Laboratories
National industry
SBA small business size standard: $41.5 million in average annual receipts
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.
Government contracts for this service: PSC Q301 Reference Laboratory Testing
Code facts
- Part of
-
-
62
-
621
-
6215
- 62151
-
6215
-
621
-
62
- Contract awards
- 1,092 In the last 12 months
- Contract obligations
- $475,378,396 In FY2025
NAICS codes and definitions come from the U.S. Census Bureau, size standards from the SBA and contract spending from SAM.gov/FPDS.
Business activities under NAICS 621511
- Bacteriological laboratories, diagnostic
- Bacteriological laboratories, medical
- Biological laboratories, diagnostic
- Blood analysis laboratories
- Cytology health laboratories
- DNA testing laboratories
- Forensic laboratories, medical
- Genetic testing laboratories
- Laboratories, medical (except radiological, X-ray)
- Laboratory testing services, medical (except radiological, X-ray)
- Medical laboratories (except radiological, X-ray)
- Medical pathology laboratories
- Mycology health laboratories
- Parasitology health laboratories
- Pathological analysis laboratories
- Pathology laboratories, medical
- Testing laboratories, medical
- Toxicology health laboratories
- Urinalysis laboratories
Looking for another activity? Search the NAICS code lookup or browse business activities from A to Z.
Contract obligations by fiscal year
| Fiscal year | Obligated |
|---|---|
| FY2027 To date | $21,858,736 |
| FY2026 | $258,477,982 |
| FY2025 | $475,378,396 |
| FY2024 | $401,611,233 |
| FY2023 | $421,429,147 |
Top contractors by obligations
| Rank | Contractor | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Quest Diagnostics Incorporated | $63,898,627 | |
| 2 | Laboratory Corporation Of America | $52,142,103 | |
| 3 | Foundation Medicine, Inc. | $19,162,860 | |
| 4 | SNA International LLC | $18,503,140 | |
| 5 | Center For Disease Detection, LLC | $13,602,800 | |
| 6 | The Henry M. Jackson Foundation For The Advancement Of Military Medicine, Inc. | $11,353,978 | |
| 7 | Arup Laboratories Inc. | $11,170,379 | |
| 8 | Baylor Miraca Genetics Laboratories LLC | $10,799,922 | |
| 9 | College Of American Pathologists | $9,751,928 | |
| 10 | Laboratory Corporation Of America | $9,461,268 |
See the full FY2025 ranking of NAICS 621511 contractors, by parent company.
Top funding agencies by obligations
| Rank | Agency | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Department of Veterans Affairs | $245,962,013 | |
| 2 | Defense Health Agency | $105,985,944 | |
| 3 | Washington Headquarters Service | $18,473,134 | |
| 4 | Department of the Navy | $7,993,606 | |
| 5 | Department of Justice | $7,609,722 | |
| 6 | Department of State | $6,607,983 | |
| 7 | Office of the Secretary of Defense | $3,958,924 | |
| 8 | Department of Homeland Security | $3,946,932 | |
| 9 | Department of the Army | $3,242,349 | |
| 10 | Department of the Interior | $754,186 |
Top PSC codes by obligations
| Rank | PSC code | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Q301 Reference Laboratory Testing | $218,385,546 | |
| 2 | Q999 Other Medical Services | $20,033,020 | |
| 3 | Q515 Pathology Services | $10,622,372 | |
| 4 | 6640 Laboratory Equipment and Supplies | $7,391,724 | |
| 5 | R499 Other Professional Services | $4,546,890 | |
| 6 | Q522 Radiology Services | $4,492,452 | |
| 7 | 6550 In Vitro Diagnostic Substances, Reagents, Test Kits and Sets | $2,868,503 | |
| 8 | Q502 Cardiology | $2,604,280 | |
| 9 | S112 Electric Services | $1,436,960 | |
| 10 | 6505 Drugs and Biologicals | $1,156,900 |
Contract obligations by state
| Rank | Place of performance | Obligated, last 12 months | Share |
|---|---|---|---|
| 1 | Maryland | $44,889,447 | |
| 2 | Texas | $37,087,467 | |
| 3 | Massachusetts | $28,128,061 | |
| 4 | Hawaii | $23,691,620 | |
| 5 | Virginia | $21,997,078 | |
| 6 | Illinois | $19,329,357 | |
| 7 | New York | $13,259,207 | |
| 8 | Arizona | $11,988,353 | |
| 9 | Pennsylvania | $7,743,361 | |
| 10 | Oregon | $7,507,340 | |
| 11 | Georgia | $7,415,395 | |
| 12 | Washington | $7,182,496 | |
| 13 | Florida | $6,950,687 | |
| 14 | Missouri | $5,231,296 | |
| 15 | Utah | $5,131,482 | |
| 16 | Minnesota | $4,187,195 | |
| 17 | New Mexico | $4,173,525 | |
| 18 | South Dakota | $4,030,856 | |
| 19 | Nevada | $3,215,930 | |
| 20 | Wisconsin | $2,930,555 | |
| 21 | South Carolina | $2,860,079 | |
| 22 | Mississippi | $2,560,201 | |
| 23 | Guam | $2,250,379 | |
| 24 | Ohio | $2,183,441 | |
| 25 | Idaho | $2,108,028 | |
| 26 | Nebraska | $1,878,214 | |
| 27 | Kansas | $1,808,404 | |
| 28 | Oklahoma | $1,705,107 | |
| 29 | Indiana | $1,651,144 | |
| 30 | Michigan | $1,545,484 | |
| 31 | Colorado | $1,486,863 | |
| 32 | Montana | $1,382,892 | |
| 33 | Alaska | $1,338,099 | |
| 34 | North Dakota | $1,198,085 | |
| 35 | Iowa | $1,186,631 | |
| 36 | Louisiana | $644,801 | |
| 37 | Connecticut | $562,395 | |
| 38 | Alabama | $263,495 | |
| 39 | Puerto Rico | $213,027 | |
| 40 | West Virginia | $183,539 | |
| 41 | Arkansas | $132,682 | |
| 42 | New Hampshire | $111,628 | |
| 43 | Rhode Island | $107,319 | |
| 44 | Vermont | $28,251 | |
| 45 | Maine | $7,741 |
Show all 45
Shares are of everything obligated under NAICS 621511 in the last 12 months before deobligations, including work performed abroad or with no place of performance on record.
Contract opportunities
Show 37 more
Latest 47 of 6,364 listed here. See the rest on GovTribe.
Size standard history
Federal Register rules that named this code
Show all 11
Proposed size standard changes
| Proposed rule | Published | Comments |
|---|---|---|
| Small Business Size Standards: Monetary-Based Industry Size Standards | Closed Oct 21, 2025No final rule found |
From the NAICS codes each rule's amendments to 13 CFR 121.201 name. Rules that print their size standard tables as images aren't listed.
Quick answers
What is NAICS 621511?
NAICS 621511 is Medical Laboratories, a national industry in NAICS 62, Health Care and Social Assistance.
What is the NAICS code for urinalysis laboratories?
The NAICS code for urinalysis laboratories is 621511, Medical Laboratories.
What is the NAICS code for DNA testing laboratories?
The NAICS code for DNA testing laboratories is 621511, Medical Laboratories.
What is the NAICS code for blood analysis laboratories?
The NAICS code for blood analysis laboratories is 621511, Medical Laboratories.
When did the size standard for NAICS 621511 last change?
The most recent Federal Register rule on record that names NAICS 621511 in the SBA's size standards is "Small Business Size Standards: Adjustment of Monetary-Based Size Standards, Disadvantage Thresholds, and 8(a) Eligibility Thresholds for Inflation" (87 FR 69118), published Nov 17, 2022 and effective Dec 19, 2022.
How much do federal agencies spend under NAICS 621511?
Federal contracts under NAICS 621511 obligated $475,378,396 in fiscal year 2025 and $1,578,755,494 in fiscal years 2023 through 2027.
Who are the largest contractors under NAICS 621511?
The contractors with the most obligated under NAICS 621511 in fiscal years 2026 and 2027 are Quest Diagnostics Incorporated ($63,898,627); Laboratory Corporation Of America ($52,142,103); and Foundation Medicine, Inc. ($19,162,860).
Which agencies buy the most under NAICS 621511?
The agencies that obligated the most under NAICS 621511 in fiscal years 2026 and 2027 are Department of Veterans Affairs ($245,962,013), Defense Health Agency ($105,985,944) and Washington Headquarters Service ($18,473,134).
Which PSC codes are used with NAICS 621511?
The PSC codes with the most obligated under NAICS 621511 in fiscal years 2026 and 2027 are Q301 Reference Laboratory Testing, Q999 Other Medical Services and Q515 Pathology Services.
Where is the work under NAICS 621511 performed?
By place of performance, the states with the most contract obligations under NAICS 621511 over the last 12 months are Maryland ($44,889,447), Texas ($37,087,467) and Massachusetts ($28,128,061).
What is the latest contract opportunity under NAICS 621511?
The latest contract opportunity under NAICS 621511 is Q301--STAT Reference Laboratory (VA-27-00019665), special notice from Veterans Integrated Service Network 2 (VHA), posted November 6, 2026.
On GovTribe
See everything under NAICS 621511
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