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Cocaine Hair Drug Screen (Quantitative)

Published: August 9, 2026Updated: August 16, 2026

This test measures the presence of cocaine metabolites in your hair over a period of time, typically reflecting drug use from about 90 days before to the time of testing.

Quick summary

["Hair drug testing can help track long-term substance use patterns beyond recent urine samples."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
34715-3
Short code
Cocaine Hair Ql Scn
Synonyms
Cocaine Hair Ql Scn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
screen
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What Does This Test Measure?

Hair contains trace amounts of substances absorbed through the skin, including drugs like cocaine. This test detects cocaine metabolites (chemical breakdown products) that accumulate in hair strands over time. Unlike urine tests, which show recent use, hair tests provide a broader timeline of exposure.

Why Might You Need This Test?

Healthcare providers may recommend this test if you have concerns about long-term substance use, are part of a treatment program, or need documentation for employment, legal, or insurance purposes. It’s also used in some workplace or criminal background checks.

How Is the Test Performed?

A small hair sample (usually from the scalp) is collected. The hair is processed to analyze cocaine metabolites using advanced laboratory techniques, such as mass spectrometry or chromatography. Results are reported as a concentration of metabolites in the hair.

What Are the Limitations?

Hair tests can’t distinguish between active use and passive exposure (e.g., secondhand smoke or environmental contamination). They don’t show recent use—only long-term exposure. False positives can occur if you’ve used other substances or had exposure to contaminated products.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Cocaine Hair Test

Frequently asked questions

How long does it take to get results?
Results typically take 1–2 weeks to process and are sent to your healthcare provider or ordering facility. Follow-up may be needed if results are abnormal.
Can I use hair products or shampoos before testing?
Yes, but avoid heavy use of hair products, dyes, or treatments that could interfere with the test. Stick to normal grooming routines to ensure accurate results.
What does a positive result mean?
A positive result indicates past exposure to cocaine metabolites in your hair, but it doesn’t confirm recent use. Consult your healthcare provider for interpretation and next steps, as they may recommend additional testing or support services.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy