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Urine Promethazine Concentration (Mass)

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

This test measures the amount of promethazine, a medication used to treat allergies, in your urine over a specified period.

Quick summary

["It helps assess how your body processes this drug and may be used in monitoring treatment or detecting drug use."]

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

Key facts at a glance

LOINC
3989-1
Short code
Promethazine Ur-mCnc
Synonyms
Promethazine Ur-mCnc
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 Might Be Ordered

Your healthcare provider may request this test if you’ve been prescribed promethazine for allergies or other conditions, or if there’s suspicion of promethazine misuse. It can also be part of a broader evaluation for drug metabolism or toxicity.

What to Expect Before the Test

No special preparation is typically needed, but you may be asked to collect a 24-hour urine sample. Follow your provider’s instructions carefully to ensure accurate results.

What the Results Mean

Results show the total amount of promethazine excreted in urine. Higher than expected levels might indicate overuse, improper metabolism, or potential drug interactions. Your provider will interpret results in the context of your medical history and symptoms.

Common Reasons for Testing

This test is often used in clinical settings to monitor adherence to promethazine therapy, evaluate drug interactions, or assess compliance in controlled environments (e.g., detox programs).

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Promethazine is a sedating antihistamine. Elevated urine levels could suggest overdose, impaired liver function affecting metabolism, or prolonged exposure. Low levels may indicate insufficient dosing or rapid clearance. Always discuss results with your healthcare provider.

Short name

Urine Promethazine

Frequently asked questions

What is promethazine, and why might my urine be tested for it?
Promethazine is a medication used to treat allergies, itching, or as a sedative. Urine testing for promethazine helps track how much of the drug is in your system, which can be important for managing side effects or ensuring proper dosing.
How is the urine sample collected for this test?
You’ll typically collect all urine produced over a 24-hour period in a clean container. Your provider will guide you on timing and storage to prevent contamination.
Can diet or other medications affect this test?
Dietary substances (e.g., certain foods, supplements) or other medications may not directly interfere with promethazine testing, but they could influence your overall health status. Always inform your provider about all medications or supplements you’re taking.
  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