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Urine Free Hydromorphone Mass Concentration

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

This test measures the amount of hydromorphone (a pain medication) that is not attached to other substances in your urine. It helps determine how much of the drug is freely available in your system.

Quick summary

["This test assesses free hydromorphone levels in urine to evaluate drug exposure and potential toxicity."]

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

Key facts at a glance

LOINC
46971-8
Short code
HYDROmorphone Free Ur Cfm-mCnc
Synonyms
HYDROmorphone Free Ur Cfm-mCnc
Category
chemistry
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

Why This Test Is Done

Your healthcare provider may order this test if you are taking hydromorphone (e.g., Dilaudid) and want to check how much of the drug is freely circulating in your urine. It can also be used in drug testing, monitoring for overdose risks, or assessing compliance with treatment plans.

What to Expect Before the Test

No special preparation is needed. You will provide a urine sample, typically collected in a clean container. Follow any specific instructions your provider gives you, such as avoiding certain foods or medications before testing.

How the Test Works

The test uses a specialized laboratory method to measure the free (unbound) hydromorphone in your urine. This involves detecting the drug’s presence without interference from other substances in the sample.

What the Results Mean

Results indicate the concentration of free hydromorphone in your urine. Higher levels may suggest recent use, improper dosing, or potential toxicity. Your provider will interpret the results in the context of your medical history and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Urine Free Hydromorphone

Frequently asked questions

What does free hydromorphone testing indicate?
Free hydromorphone testing helps assess drug metabolism, compliance with treatment, and potential risks of overdose. It can also support evaluations in cases of suspected drug abuse or monitoring patients on controlled substances.
How long does it take to get results?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time. Follow-up with your provider to discuss the findings.
Can I drink alcohol before this test?
No, avoid alcohol before providing your urine sample, as it may affect test accuracy or interfere with the results. Stick to your usual diet and hydration unless instructed otherwise by your provider.
  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