Most people are familiar with urine drug testing, but urine isn't the right specimen for every situation. When the goal is to evaluate drug use over a longer period, nail drug testing may provide another option.

Bluestar Blood Drug & Fingerprinting provides urine, hair and nail drug testing for individuals and organizations throughout the Dallas–Plano area. Choosing between these tests depends on what needs to be detected, the reason for testing and whether an employer, court, attorney or other requesting organization has specified a particular testing method.

Understanding these differences before scheduling can help you select the appropriate test.

What Is a Nail Drug Test?

A nail drug test uses clippings from fingernails or, depending on the testing requirements, toenails as the specimen submitted to a laboratory.

Nails are primarily composed of keratin. As nails grow, drugs and their metabolites may become incorporated into the nail material, allowing a laboratory to analyze the specimen for evidence of exposure.

Published toxicology research has demonstrated the use of nail specimens for detecting drugs over an extended historical period. However, detection varies according to the substance, specimen, individual growth characteristics and laboratory methodology. For that reason, nail testing should not be interpreted as providing an exact date on which a substance was used.

Nail drug testing uses collected nail clippings that are submitted to a laboratory for analysis.

Why Would Someone Choose Nail Drug Testing?

One of the main reasons to consider nail testing is the need to evaluate a longer history of potential drug exposure rather than focusing primarily on recent use.

Urine testing is much more oriented toward recent drug use. For comparison, Quest Diagnostics states that laboratory urine testing typically detects recent use during approximately the previous 24–72 hours, although detection varies considerably by substance and circumstances.

Hair testing also offers a longer detection period. Quest describes its hair testing as capable of identifying a pattern of repetitive drug use for up to approximately 90 days.

That distinction is important.

Someone searching for a drug test shouldn't simply ask:

"Which drug test is the strongest?"

A better question is:

"What period and substances does my testing requirement need to evaluate?"

The answer may point toward urine, hair, nail or another specimen type.

Nail Drug Testing vs. Urine Drug Testing

Urine testing remains one of the most widely used forms of workplace drug testing and can be appropriate for pre-employment, random, post-accident, reasonable-suspicion and other programs.

It also offers a large selection of available drug panels.

Nail testing serves a different purpose because it may provide information about drug exposure across a longer historical period.

This means the two tests should not necessarily be viewed as competitors.

Urine testing may be preferable when:

Recent drug use is the primary concern
A workplace program specifies urine
DOT testing requirements apply
Faster screening options are needed
A particular urine panel has been ordered

Nail testing may be considered when:

A longer historical assessment is desired
Nail testing has specifically been ordered
An appropriate hair specimen isn't available
A legal or personal testing situation calls for a different specimen
A broader specialty drug panel is needed

For federally regulated testing, the required testing rules must be followed. A nail test should not be substituted simply because it has a longer detection window.

Nail Drug Testing vs. Hair Drug Testing

Hair and nail testing both provide alternatives to urine when the purpose of testing involves a longer history.

Hair testing is well established for identifying patterns of repetitive drug use over an extended period. Quest reports that its hair-testing methodology can evaluate a pattern of repetitive use for up to approximately 90 days.

However, hair isn't always an appropriate or available specimen.

Nail testing may therefore be considered when a longer historical perspective is desired or when the requesting party specifically requires a nail specimen.

Neither method should be used to determine an exact date or amount of drug use. Even with hair, growth rates differ between and within individuals, which is why Quest cautions against using segmented hair analysis to assign drug use to precise time periods.

That is an important distinction for legal and personal testing: a positive laboratory result can indicate detection of the substance or metabolite tested, but it shouldn't automatically be interpreted as proving precisely when or how much was consumed.

Who May Need a Nail Drug Test?

Nail testing may be requested for several different purposes.

These can include:

Personal drug testing
Court-related testing
Family or custody matters
Substance-use monitoring
Certain workplace testing situations
Legal requirements
Situations requiring an extended historical assessment

The important point is that the reason for testing should determine the test selected.

If a court order, attorney, employer or other organization provided written testing instructions, bring those instructions with you.

A "drug test" isn't a single standardized product. Different tests evaluate different substances and use different specimens and laboratory methodologies.

What Happens During a Nail Drug Test?

The collection itself is relatively straightforward.

An appropriate nail specimen is collected and prepared for laboratory testing. The specimen is documented and handled according to the requirements of the test being performed.

For testing that must be legally defensible, proper chain-of-custody procedures are particularly important.

Bluestar states that its testing results can be legally admissible when proper legal chain-of-custody procedures are followed.

After collection, the specimen is submitted to the appropriate laboratory for analysis.

What Drugs Can Nail Testing Detect?

This depends entirely on the panel ordered.

Bluestar currently offers multiple nail-testing options, including:

9-Panel Nail Drug Test — $289

and

16-Panel Nail Drug Test — $719

Bluestar also offers multiple hair drug-testing panels, including 10-, 12- and 15-panel options.

A larger panel isn't automatically the correct choice.

If the requesting party needs testing for specific substances, the first step should be confirming that those substances are included in the selected panel.

Does a Nail Drug Test Show Exactly When Someone Used Drugs?

No.

This is one of the most important limitations to understand.

A nail test can provide evidence regarding substances detected in the specimen, but it shouldn't be interpreted as a calendar showing exactly when a drug was consumed.

Drug detection depends on numerous variables, including the substance, dose, testing methodology, individual physiology and characteristics of the specimen.

The same general caution applies across drug-testing methods. Laboratory experts note that even with hair—which grows at an approximate rate—variation between individuals makes assigning positive results to precise periods unreliable.

If timing is central to a legal matter, the result should therefore be interpreted within the requirements of that case rather than relying solely on a generalized detection-window estimate.

Which Drug Test Should You Choose?

Start with the purpose of the test.

If an employer, court or attorney has already provided requirements, follow those instructions.

If you are choosing the test yourself, consider:

1. How recent is the exposure you're trying to evaluate?

Recent exposure and longer-term patterns may call for different specimen types.

2. Which substances need to be included?

Don't assume every "drug test" screens for the same drugs.

3. Is the test for personal, employment or legal purposes?

Testing procedures and documentation may differ.

4. Has a particular specimen been requested?

If the order says urine, hair or nail, don't substitute another specimen without authorization.

5. Is chain of custody required?

This is particularly important when results may be used for legal or other formally documented purposes.

Drug Testing in Dallas and Plano

Bluestar Blood Drug & Fingerprinting offers multiple drug-testing options for individuals and employers, including urine, hair and nail drug testing.

Bluestar's broader drug and alcohol testing services also include DOT and non-DOT testing, pre-employment testing, random testing, post-accident testing, reasonable-suspicion testing and workplace/on-site testing.

Rather than selecting a test solely because it has the largest panel or longest potential detection period, choose the specimen and panel that match the actual reason for testing.

Need a Nail Drug Test?

Learn more about Bluestar's 16-Panel Nail Drug Test, or review all available Drug & Alcohol Testing options before scheduling.

Bluestar serves individuals and organizations from locations in the Dallas–Fort Worth area.