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Metaxalone and Creatinine, Urine

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

A urine test that measures metaxalone, a prescription muscle relaxant, along with creatinine, which helps evaluate kidney function and urine concentration.

Quick summary

["This test can help clinicians assess metaxalone exposure and interpret the urine result alongside kidney function."]

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

Key facts at a glance

LOINC
87775-3
Short code
Metaxalone/Creat Ur Cfm
Synonyms
Metaxalone/Creat Ur Cfm
Category
kidney
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
confirm
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

What is this test?

This test measures metaxalone and creatinine in a urine sample. Metaxalone is a prescription muscle relaxant, while creatinine is a waste product filtered by the kidneys.

Why might I need this test?

A clinician may order this test to check for metaxalone use, assess medication exposure, or investigate possible use during a medical evaluation. It may also be part of routine drug testing.

How is the test performed?

You provide a urine sample in a sterile container as directed by the laboratory or your clinician. The laboratory analyzes the sample and may report the metaxalone and creatinine results separately or as a calculated comparison.

How do I prepare for the test?

Follow the collection instructions provided with the test. Tell your clinician about all medicines and supplements you have taken, because they can affect drug-testing results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Urine Metaxalone and Creatinine

Frequently asked questions

Does a positive result mean I took too much metaxalone?
No. Detecting metaxalone confirms that it was present in the urine, but it does not by itself establish the dose taken or whether an overdose occurred.
Why is creatinine measured with metaxalone?
Creatinine provides information about urine concentration and kidney function. It can also help a clinician interpret the amount of metaxalone detected.
How long after taking metaxalone can it be detected?
Detection depends on the dose, timing, hydration, kidney function, and other factors. Your clinician can provide guidance based on the specific situation.
  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