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Mass fraction of methamphetamine in urine (24-hour collection)

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

This test measures the total amount of methamphetamine present in your urine over a full day, helping track drug exposure.

Quick summary

["Assesses recent methamphetamine use through urine collection over 24 hours."]

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

Key facts at a glance

LOINC
15404-7
Short code
L-methamphet MFr Ur
Synonyms
L-methamphet MFr Ur
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you have concerns about methamphetamine use, are part of a treatment program, or are being monitored for substance abuse. It helps determine if methamphetamine has been consumed within your system over the past day.

What to Expect Before the Test

You’ll need to collect all urine produced in a 24-hour period in a special container. Typically, you start timing at midnight and finish at midnight the next day. Follow your provider’s instructions carefully to ensure accurate results.

What Happens During the Test

No special preparation is needed beyond collecting your urine sample. The collected urine is sent to a lab for analysis using a sensitive detection method to measure methamphetamine levels.

What the Results Mean

Results indicate whether methamphetamine was present in your urine during the 24-hour period. A positive result suggests recent use, while a negative result means no detectable methamphetamine was found.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

24-Hour Methamphetamine Urine Test

Frequently asked questions

This test is critical for monitoring substance use disorders, assessing compliance with treatment plans, and guiding decisions about continued care or intervention strategies.
A positive result may indicate ongoing use, while a negative result could mean abstinence or recent clearance of the substance from your system. Always discuss results with your healthcare provider.
How often should I get this test?
Frequency depends on your treatment plan or monitoring needs. Your provider will determine how often this test is required based on your situation, such as whether you’re in rehab, under supervision, or managing substance use.
Can false positives or negatives occur?
Yes, false results can happen due to cross-reacting substances, recent exposure to similar compounds, or lab errors. If your results are unclear, your provider may repeat the test or use additional tests for confirmation.
  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