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Propranolol concentration in serum/plasma

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

This test measures the amount of propranolol, a medication used to treat high blood pressure, irregular heart rhythms, and anxiety, in your blood.

Quick summary

["Propranolol levels help ensure you’re taking the right dose and monitor for potential side effects."]

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

Key facts at a glance

LOINC
88699-4
Short code
Procainamide & NAPA panel SerPl
Synonyms
Procainamide & NAPA panel SerPl
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

Why This Test Matters

Your doctor may order this test if you’re taking propranolol to check if your dose is working properly or if you’re experiencing side effects like low blood pressure, dizziness, or fatigue. It’s also useful for people with certain heart conditions or those who’ve had recent changes in their medication regimen.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours before the test if the sample is taken from your vein. If you’re taking this test for urine or other fluids, follow any specific instructions your healthcare provider gives you.

How the Test Works

Blood is drawn from a vein in your arm, and the sample is sent to a lab where it’s analyzed using a sensitive method to detect the presence of propranolol. If testing urine or another fluid, a small sample is collected and tested similarly.

Possible Results and What They Mean

Results are compared to a reference range that varies by lab and individual factors like age, sex, and kidney function. High levels might indicate you’re taking too much medication, while low levels could mean you’re not absorbing it well or need an adjustment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated propranolol levels may signal overdose, drug interactions (e.g., with other beta-blockers), or impaired metabolism. Low levels could indicate poor adherence to the medication, liver disease affecting drug processing, or incorrect dosing. Regular monitoring helps prevent complications like heart rhythm issues or worsening of underlying conditions.

Short name

Serum/Plasma Propranolol

Frequently asked questions

What causes my propranolol level to be too high?
High levels may result from taking too much propranolol, drug interactions with other medications (like other beta-blockers, calcium channel blockers, or certain antidepressants), or conditions that slow how your body processes drugs (such as liver disease). Always follow your doctor’s instructions on dosage and avoid mixing medications without approval.
What should I do if my propranolol level is too low?
If your levels are too low, your doctor may adjust your dose, check for potential issues like poor absorption, or investigate if another medication is interfering. They might also recommend a different form of propranolol (e.g., sustained-release vs. immediate-release) or further tests to rule out liver or kidney problems.
Can diet or lifestyle affect my propranolol levels?
While diet and lifestyle changes like exercise or stress management can impact overall health, they rarely directly affect propranolol levels. However, maintaining a healthy weight, avoiding excessive alcohol (which can affect liver function), and managing stress can indirectly support your body’s ability to process medications properly.
  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