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NAICS Code· 621511

NAICS 621511: Medical Laboratories

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 Cross-References.Show more

NAICS 621511 – Medical Laboratories encompasses the operation of facilities that perform clinical diagnostic testing on human specimens, including blood, tissue, and bodily fluids, to support medical diagnosis, treatment, and public health surveillance. Services under this code include molecular diagnostics, immunology assays, microbiological cultures, cytology, and toxicology screening, often delivered through automated analytical platforms and regulated under CLIA, CAP, and ISO standards.

116
Active Contracts
$915.3M
Total Obligations (12mo)
1.4K
Awarded Contracts (12mo)
292
Contractors Awarded (12mo)
1
Median Bidders per Award
+17.9%
YoY Growth

Industry Spending Overview

Federal obligations, top contractors and agencies, and related industry codes for NAICS 621511.

AI Industry Description

NAICS 621511 – Medical Laboratories encompasses the operation of facilities that perform clinical diagnostic testing on human specimens, including blood, tissue, and bodily fluids, to support medical diagnosis, treatment, and public health surveillance. Services under this code include molecular dia...

NAICS 621511 – Medical Laboratories encompasses the operation of facilities that perform clinical diagnostic testing on human specimens, including blood, tissue, and bodily fluids, to support medical diagnosis, treatment, and public health surveillance. Services under this code include molecular diagnostics, immunology assays, microbiological cultures, cytology, and toxicology screening, often delivered through automated analytical platforms and regulated under CLIA, CAP, and ISO standards. In the federal contracting landscape, these laboratories support mission-critical health monitoring for diplomatic personnel, military deployments, global health initiatives, and emergency response operations, frequently through outsourced contracts with specialized service providers rather than in-house federal labs. The primary contractor in this sector is ALTITUDE TECHNOLOGIES INC., a mid-sized firm with expertise in deploying scalable, compliant laboratory solutions for federal clients. The competitive landscape is dominated by specialized service providers with strong regulatory compliance credentials, rather than large primes, reflecting the technical and accreditation-intensive nature of clinical lab services. Contracting typically requires CAP accreditation, CLIA certification, and experience in high-complexity testing environments. The Department of State is the leading federal agency awarding contracts under this NAICS code, primarily to support medical surveillance and diagnostic services for U.S. embassies, consulates, and overseas personnel. Demand is driven by global health security programs, employee wellness mandates, and biothreat detection protocols in high-risk regions, with contracts often structured as indefinite-delivery/indefinite-quantity (IDIQ) vehicles requiring rapid response capabilities. The market is characterized by high barriers to entry due to stringent regulatory requirements, but offers consistent opportunity density for accredited, agile providers with proven experience in international health logistics and federal compliance. Contractors with dual capabilities in both clinical diagnostics and expeditionary lab support are best positioned to compete for sustained, mission-critical awards.

Small Business Size Standard

The SBA threshold that decides who can bid NAICS 621511 work as a small business.

$41.5M
Applies to the whole industry code

The SBA cap for this NAICS (13 CFR 121.201). A business at or under it can self-certify as small for work in this code, which is what makes it eligible for a small-business set-aside. The cap is set per NAICS, so the same company can be small in one code and not in another.

13 CFR 121.201, effective January 1, 2026. The SBA revises the table roughly once a year.

Top Contractors

Companies with the highest total award value under NAICS 621511, ranked by dollars won.

Ranked by total awards
CompanyTotal AwardsContracts
LABORATORY CORPORATION OF AMERIC$496.7M322
QUEST DIAGNOSTICS INCORPORATED$219.8M404
FOUNDATION MEDICINE, INC.$21.8M2
CENTER FOR DISEASE DETECTION, LLC$14.0M4
BAYLOR MIRACA GENETICS LABORATORIES LLC$11.6M2
ARUP LABORATORIES, INC.$9.8M13
OREGON HEALTH & SCIENCE UNIVERSITY$9.0M1
FULGENT THERAPEUTICS LLC$6.6M2
LABORATORY CORPORATION OF AMERICA$5.8M1
TEMPUS AI, INC$5.5M1

Top Agencies

Federal agencies directing the most contract spending toward NAICS 621511.

Dha Enterprise Medical Support Ems-Cd1 award$364.7M
Department Of Veterans Affairs492 awards$247.7M
Department Of Defense255 awards$85.3M
245-NETWORK Contract Office 5 (36C245)2 awards$49.9M
247-NETWORK Contract Office 7 (36C247)1 award$46.0M
Department Of Health And Human Services129 awards$43.2M
262-NETWORK Contract Office 22 (36C262)1 award$30.9M
260-NETWORK Contract Office 20 (36C260)3 awards$15.8M
Department Of Justice417 awards$8.2M
250-NETWORK Contract Office 10 (36C250)3 awards$7.0M

Competition

How many companies historically bid on federal awards in NAICS 621511, from bidder counts reported on USAspending.

Usually Single-Bid

Half or more of reported awards drew exactly one bidder, usually a sign of incumbent-held work rather than an open field. · 38,548 reported awards

Median Bidders

1

Per reported award, all-time

Single-Bid Awards

73%

Share of reported awards with one bidder

10+ Bidder Awards

1%

Share of reported awards with 10+ bidders

Reported Awards

38,548

76% of 50,469 total awards

Bidder Count Distribution by Fiscal Year

Share of reported awards in each bidder-count bracket per federal fiscal year.

How this code compares up the NAICS hierarchy. Parent cohorts pool every code under their prefix, so they are the steadier baseline when a 6-digit sample is thin.

Industry FamilyCompetitionMedian BiddersSingle-BidBidder MixReported Awards
621511This Code
Medical Laboratories
Usually Single-Bid173%
38,54876% of 50,469
62151NAICS Industry
Usually Single-Bid172%
47,93277% of 61,939
6215Industry Group
Medical and Diagnostic Laboratories
Usually Single-Bid172%
47,93277% of 61,939
621Subsector
Usually Single-Bid165%
305,49284% of 362,305
62Sector
Health Care and Social Assistance
Usually Single-Bid171%
550,70684% of 657,924

Bidder counts reported on past federal awards in this NAICS (USAspending). An open opportunity has no bidders yet, so this is the historical norm for similar work, not a fact about this solicitation. Not all awards report bidder counts, and fewer bidders often means incumbent-held work rather than an easier win. Federal reporting of bidder counts fell from ~96% of awards (FY2016) to ~30% (FY2018 onward); the chart shows shares of reported awards, and washed-out stretches mark years with fewer than 30 of them.

Related NAICS Codes

Industries similar to Medical Laboratories, by shared sector, subsector, and industry group.

Diagnostic Imaging Centers

This U.S. industry comprises establishments known as diagnostic imaging centers primarily engaged in...
621512Same Industry GroupHigh Similarity

Offices of Physicians (except Mental Health Specialists)

This U.S. industry comprises establishments of health practitioners having the degree of M.D. (Docto...
621111Same SubsectorMedium Similarity

Offices of Physicians, Mental Health Specialists

This U.S. industry comprises establishments of health practitioners having the degree of M.D. (Docto...
621112Same SubsectorMedium Similarity

Offices of Dentists

This industry comprises establishments of health practitioners having the degree of D.M.D. (Doctor o...
621210Same SubsectorMedium Similarity

Offices of Chiropractors

This industry comprises establishments of health practitioners having the degree of D.C. (Doctor of ...
621310Same SubsectorMedium Similarity

Offices of Optometrists

This industry comprises establishments of health practitioners having the degree of O.D. (Doctor of ...
621320Same SubsectorMedium Similarity

Offices of Mental Health Practitioners (except Physicians)

This industry comprises establishments of independent mental health practitioners (except physicians...
621330Same SubsectorMedium Similarity

Offices of Physical, Occupational and Speech Therapists, and Audiologists

This industry comprises establishments of independent health practitioners primarily engaged in one ...
621340Same SubsectorMedium Similarity

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NAICS 621511 FAQ

Frequently Asked Questions

NAICS code 621511 covers Medical Laboratories. 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 Cross-References.

Recently Posted in Medical Laboratories

NAICS: 621511
New
Federal
Q301-- New Lab Staffing Contract Fiscal Year 2027-Path & Lab
Solicitation # 36C24926Q0334_1
The Department of Veterans Affairs, Network Contracting Office 9, is soliciting quotes for a five-year Indefinite Delivery, Indefinite Quantity (IDIQ) contract to provide laboratory staffing services at the Lt. Col Luke Weathers Jr. VAMC in Memphis, Tennessee. The performance period runs from April 1, 2027, to March 31, 2032, with a total estimated value of 41.5 million dollars. This procurement is a 100 percent set-aside for Service-Disabled Veteran-Owned Small Businesses (SDVOSBs). The contractor is required to provide up to 16 full-time equivalent key personnel to support three daily shifts, with a guaranteed minimum of 3,402 hours and a maximum not to exceed 340,240 hours. Award will be based on a best-value determination using comparative analysis of administrative compliance, past performance, technical capability, and price. Technical evaluation specifically emphasizes the quality of certifications and the effectiveness of the contractor's contingency plan for ensuring uninterrupted services. Contractors must adhere to strict clinical standards, including JCAHO, CAP, FDA, and CLIA regulations, and comply with all VA security, confidentiality, and HIPAA requirements. Proposals must be submitted electronically by October 14, 2026, and must include specific certifications regarding the Immigration and Nationality Act, organizational conflicts of interest, and OIG exclusion lists.
249-NETWORK Contract Office 9 (36C249)

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3 days ago

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in 2 days
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NAICS: 621511
New
Federal
NWI Offsite Pathology Services
Solicitation # 36C26326R0063
Network Contract Office 23 (36C263)

POSTED

3 days ago

DEADLINE

in 29 days
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NAICS: 621511
Awarded
International
Send Away Test for Oncotype DX Breast Recurrence Score
Solicitation # C454848
The Gloucestershire Hospitals NHS Foundation Trust has issued an award notice for the provision of the Oncotype DX Breast Recurrence Score. This contract focuses on the implementation of a specialized genomic assay designed to offer personalized insights into the biological characteristics of breast cancer for individual patients. The procurement is identified by solicitation number C454848 and was posted on October 8, 2026. Kelly Attwood serves as the primary point of contact for this arrangement, which ensures the availability of critical diagnostic testing to guide patient treatment strategies.
Gloucestershire Hospitals NHS Foundation Trust

POSTED

4 days ago

DEADLINE

N/A
View Details
NAICS: 621511
New
International
Microbiology Services Managed Service Contract
Solicitation # LR3-208-2026
NHS Lothian is seeking a provider for a next-generation automated laboratory solution to be delivered as a managed services contract for diagnostic and laboratory services at the Royal Infirmary of Edinburgh. This comprehensive Microbiology laboratory managed services contract encompasses the provision of service management to ensure all regulatory requirements are met, along with the delivery of integrated IT firmware, major analysers, reagents, and consumables necessary to support the majority of the test repertoire. The solicitation, identified by number LR3-208-2026 and issued by the Lothian Health Board, was posted on October 8, 2026, with a response deadline of October 23, 2026. The project falls under NAICS code 621511, focusing on medical and diagnostic laboratory services. Interested parties may coordinate through the point of contact, Roberta Rockaite, to address the requirements of this integrated healthcare infrastructure project.
Lothian Health Board

POSTED

4 days ago

DEADLINE

in 11 days
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NAICS: 621511
New
Federal
Electron Microscopy Consultation ServicesThis subcontract for Electron Microscopy Consultation Services involves providing specialized examination of heart biopsy thin sections for prime contractors supporting Department of Veterans Affairs medical center projects in Salt Lake City. The scope of work focuses on patients one month post-transplant or those suspected of recurrent amyloidosis or Adriamycin cardio toxicity. To qualify, the provider must hold an unrestricted U.S. medical license and maintain active malpractice insurance. A critical performance requirement is the delivery of final electronic reports within 24 hours of receiving the specimens. This opportunity is categorized under NAICS code 621511 and is managed through Network Contract Office 19.
Network Contract Office 19 (36C259)

POSTED

4 days ago

DEADLINE

in 4 days
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NAICS: 621511
New
Federal
Q522--Heart Transplant Biopsies Consultation Services (Examination and Interpretation)-Light Microscopy, Immunofluorescence, and Electron Microscopy-Salt Lake City VA Health Care System
Solicitation # 36C25926Q0622
The Department of Veterans Affairs, Network Contracting Office 19, is conducting market research through a Sources Sought Notice for heart transplant biopsy consultation services at the George E. Wahlen VA Medical Center in Salt Lake City, Utah. The requirement is structured as a base year with four option years and involves the professional examination and interpretation of biopsy slides using light microscopy, immunofluorescence, and electron microscopy. The contractor is responsible for retrieving slides via local courier within two hours during business hours and providing both verbal and final electronic reports within 24 hours of specimen receipt. Additionally, the contractor must attend weekly transplant tumor board meetings at 07:00 MST and perform retrospective case reviews as needed. Qualified providers must hold unrestricted medical licenses in the United States, maintain current malpractice insurance, and demonstrate proficiency in English. The government is seeking information from interested sources, including business size, GSA contract status, and capabilities regarding the specific microscopy requirements. Responses must be submitted by October 16, 2026, and must include a completed market research questionnaire and a capabilities statement not exceeding eight pages. This notice is for planning purposes only and does not constitute a formal solicitation or a commitment to award a contract.
Network Contract Office 19 (36C259)

POSTED

4 days ago

DEADLINE

in 4 days
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NAICS: 621511
New
Federal
W065--FY27 Mobile PET/CT Imaging
Solicitation # 36C24827Q0044
The Department of Veterans Affairs, Network Contracting Office 8, is soliciting a firm-fixed-price contract for a full-service Mobile PET/CT Imaging Unit to support the Malcom Randall VA Medical Center in Gainesville, Florida. This procurement is a total set-aside for certified Service-Disabled Veteran-Owned Small Businesses (SDVOSB) under NAICS code 621511. The contractor is required to provide a Siemens Biograph 64 TruePoint Mobile PET/CT system, including all transportation, mobilization, setup, and removal. The unit must be available for dedicated use 24 hours a day, seven days a week, and must be fully operational by 8:00 a.m. within 30 calendar days of the contract award. The scope of work includes comprehensive maintenance, 24/7 technical support, and seamless integration with VAMC PACs and VISTA Imaging. The contract structure consists of a base period from October 30, 2026, to October 29, 2027, with subsequent option periods extending through October 29, 2031. Award decisions will be based on the most advantageous offer, with technical and delivery factors weighted more heavily than total evaluated price. Contractors must adhere to strict security and privacy regulations, including HIPAA, the Privacy Act of 1974, and VA-specific personnel suitability and background investigation requirements.
248-NETWORK Contract Office 8 (36C248)

POSTED

4 days ago

DEADLINE

in 4 days
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NAICS: 621511
New
Grant
Biospecimen Collection and ManagementThis subcontract for Biospecimen Collection and Management supports the National Institutes of Health under the National Institute of Dental and Craniofacial Research. The selected provider will be responsible for the collection, processing, and storage of human and animal biological samples, which includes establishing sampling sites and expanding cohorts. To ensure sample integrity, the contractor must utilize specialized cold-chain storage and biobanking facilities to deliver a fully validated and cataloged biospecimen library ready for analysis. Compliance is a critical component of this engagement, as all activities must adhere to 45 CFR Part 46 and obtain necessary IRB approval. The opportunity was posted on October 8, 2026, with a response deadline of November 10, 2026. It is categorized under NAICS code 621511 and falls under the jurisdiction of the Department of Health and Human Services.
National Institutes Of Health

POSTED

4 days ago

DEADLINE

in 29 days
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NAICS: 621511
New
SLED
On-Call Medical Evidence Collection and PhlebotomyThis subcontract for On-Call Medical Evidence Collection and Phlebotomy supports prime contractors working on projects for the San Bernardino County Sheriff, Coroner, and Public Administrator. The selected provider will be responsible for the clinical collection of medical evidence, specifically blood alcohol samples, using approved collection kits. Key duties include the precise packaging and labeling of specimens to ensure a strict chain of custody, the delivery of these specimens, and the provision of expert witness testimony in court. To qualify for this role, providers must possess professional phlebotomy licensing and pass all required background clearances. The work is performed in San Bernardino, California, under NAICS code 621511. Interested parties must submit their responses by October 29, 2026.
Administrative Services

POSTED

4 days ago

DEADLINE

in 18 days
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NAICS: 621511
New
SLED
Forensic Laboratory Testing and AnalysisThis subcontract for Forensic Laboratory Testing and Analysis involves providing laboratory analysis of forensic samples for drug and alcohol content to prime contractors working on Jefferson Parish Government projects. The selected provider will be responsible for analyzing samples for a population of over 2,000 employees in strict accordance with the HHS Mandatory Guidelines for Federal Workplace Drug Testing Programs and delivering certified test results. To be eligible, contractors must hold SAMHSA and/or CAP-FUDT certification and maintain a business office located on either the East or West Bank of Jefferson Parish. The solicitation was posted on October 7, 2026, with a response deadline of November 10, 2026.
Jefferson Parish Government

POSTED

5 days ago

DEADLINE

in 30 days
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NAICS: 621511
New
SLED
Statement of Qualifications
Solicitation # 204
The Jefferson Parish Government of Louisiana is soliciting Statements of Qualifications for forensic laboratory services to perform specimen collection and drug and alcohol testing for current and prospective employees. This small bid procurement, identified as SOQ Event No. 204, has an estimated contract value of 225,000 dollars over a three-year period. The scope of work includes both on-premises and off-premises testing conducted in accordance with Department of Health and Human Services Mandatory Guidelines for Federal Workplace Drug Testing Programs. Additionally, the selected vendor or vendors must be capable of providing expert witness testimony from laboratory directors, toxicologists, or technicians during judicial or administrative proceedings. To be eligible, laboratories must be SAMHSA and/or CAP-FUDT certified and demonstrate experience managing populations of over 2,000 employees. A mandatory requirement is that the proposer must maintain a business office or practice on either the East Bank or West Bank of Jefferson Parish, with a preference given to those located within the parish. Proposals will be evaluated on a 100-point scale, divided equally between professional experience, responsiveness and staffing, project understanding, and cost for services. Submissions must be filed electronically via the parish supplier portal by November 10, 2026, and must include a General Professional Services Questionnaire, a Human Resource Management Questionnaire, a Cost Schedule, and detailed staff credentials.
Jefferson Parish Government

POSTED

5 days ago

DEADLINE

in 30 days
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NAICS: 621511
New
Federal
Mobile Phlebotomy ServicesThis subcontract for Mobile Phlebotomy Services supports Department of Veterans Affairs heart transplant surveillance projects. The selected provider will be responsible for dispatching qualified phlebotomists to patient locations to perform blood draws, ensuring strict patient identification and maintaining a secure chain of custody for all specimens. All personnel must adhere to Clinical Laboratory Improvement Act of 1988 guidelines and are responsible for the timely delivery of collected specimens to the designated reference laboratory. Managed under the Network Contract Office 21, this opportunity falls under NAICS code 621511. The solicitation was posted on October 7, 2026, with a response deadline of October 12, 2026. The contract focuses on providing critical clinical support to prime contractors to ensure the integrity of VA surveillance data through professional specimen collection and transport.
261-NETWORK Contract Office 21 (36C261)

POSTED

5 days ago

DEADLINE

in about 9 hours
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