Product Classification | National Screning Corp

Product Classification Explained

Understanding the difference between CLIA Waived, 510(k), E&I, FUO, RUI and IUO Drug Tests

Have you ever wondered what terms like CLIA Waived, 510(k), E&I, or FUO actually mean when purchasing a drug test?

These regulatory designations are often misunderstood, but they play an important role in determining where a test can be used, who can use it, and for what purpose.

Here's a quick guide to help make sense of the terminology.

CLIA Waived

Designed for point-of-care testing.

A CLIA Waived drug test has been reviewed by the FDA and determined to be simple enough to use with a very low risk of incorrect results when the manufacturer's instructions are followed.

These tests are commonly used in:

Physician offices
Occupational Health clinics
Urgent care centers
Hospitals
Other CLIA-certified healthcare facilities

Because they are CLIA Waived, healthcare providers can perform testing on-site.

Best for: Clinical and patient-care environments.

510(k) Cleared

Demonstrated substantial equivalence.

510(k) clearance means the manufacturer has demonstrated to the FDA that the device is substantially equivalent to another legally marketed device.

Many workplace drug tests are 510(k) cleared, providing confidence that the product meets FDA requirements for safety and effectiveness.

510(k) clearance is not the same as CLIA Waived.

A product may be:

510(k) cleared only
Both 510(k) cleared and CLIA waived

Best for: Employers, third-party administrators, occupational health programs, and workplace drug testing.

Employment & Insurance (E&I) Testing

Designed for non-clinical workplace testing.

E&I drug tests are intended for employment, insurance, and other non-medical screening applications. They are not intended to diagnose, treat, or monitor disease. E&I drug tests are subjected to the same validation standards applied to 510(k) tests but since they are based on existing (predicate) devices with 510(k) clearance they do not require the pre-market notification required for a 510(k).

These tests are commonly used for:

Pre-employment screening
Random workplace testing
Post-accident testing
Reasonable suspicion testing
Return-to-duty and follow-up testing
Insurance-related screening

Unlike CLIA Waived tests, E&I products are intended for administrative decision-making, where test results support employment or insurance decisions rather than patient care.

Best for: Employers, third-party administrators, occupational health programs, and workplace drug testing.

Forensic Use Only (FUO)

Intended for forensic and legal testing applications.

A Forensic Use Only (FUO) drug test is designed for situations where the results may be used to support legal, employment, judicial, or administrative decisions rather than employment decisions, medical diagnosis or patient care.

Common applications include:

Court-ordered testing
Criminal justice programs
Probation and parole
Law enforcement
Family or custody cases

Unlike CLIA Waived tests, FUO products are not intended for diagnosing or treating disease. Instead, they are designed for non-clinical testing programs where results may have legal or employment consequences.

Investigational Use Only (IUO) / Research Use Only (RUO)

Used for clinical investigative studies or evaluation and research.

RUO and IUO products are similar in that they cannot be used for workplace testing or clinical decision making but while RUO classified products are used solely for laboratory research and cannot be used for clinical studies, RUO products can be used for clinical performance, method comparison and validation studies.

RUO and IUO are uncommon in the drug testing market because they indicate products that are still in the research or investigational phase and are not intended for routine use in employment or clinical testing. You may encounter these classifications if you take part in an evaluation study or research.

A Common Misconception

Many people assume that a CLIA waived or 510(k) test is "better" than an E&I test. In reality, the different designations serve different intended uses.

CLIA waived tests are designed for clinical healthcare settings and patient care.
510(k) / E&I tests are designed for workplace and insurance screening where the results support administrative or employment decisions. 510(k) tests were subjected to pre-market notification whereas E&I tests did not require it by mirroring a predicate.

Choosing the right designation depends on how the test will be used—not which one is more accurate.