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Serum/plasma concentration of propoxyphene metabolite (active metabolite of propoxyphene, measured via immunoassay)

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

This test measures the level of an active drug metabolite in your blood, which helps assess how your body is processing propoxyphene (a pain reliever).

Quick summary

["This test helps monitor drug levels to ensure safe and effective pain management."]

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

Key facts at a glance

LOINC
73188-5
Short code
Propoxyph+APAP ind plt IgM SerPl Ql FC
Synonyms
Propoxyph+APAP ind plt IgM SerPl Ql FC
Category
hematology
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
flow-cytometry
CPT
82784
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 Is This Test Measuring?

Propoxyphene is a prescription pain medication broken down into smaller, active compounds in your body. This test specifically looks for one of those breakdown products in your serum or plasma. The presence of this metabolite helps doctors determine if the medication is working as intended and if your dose needs adjustment.

Why Might You Need This Test?

Your healthcare provider may order this test if you’re taking propoxyphene for chronic pain, especially if you have kidney issues or are taking other medications that could affect how your body processes it. It helps prevent side effects like drowsiness or overdose by ensuring safe drug levels.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. If you’re on blood thinners, let your doctor know before the test.

What Does the Test Result Mean?

Results are compared to a general reference range for this metabolite, but exact values depend on your medication dose, kidney function, and other health factors. Your doctor will interpret the result in the context of your treatment plan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Propoxyphene metabolite level

Frequently asked questions

Why was this test ordered?
Your doctor may have ordered this test to check if your dose of propoxyphene is appropriate, to monitor for toxicity (e.g., excessive sedation), or to adjust treatment if you have kidney problems.
What if my result is outside the expected range?
If your result is higher than expected, it might mean your body isn’t processing the medication well, possibly due to kidney issues or other medications. If lower, your dose may be too low for effective pain relief. Your doctor will discuss next steps with you.
How often will I need this test?
Frequency depends on your treatment plan. Some patients need it monthly or as needed to adjust doses, while others may only need it once during treatment.
  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