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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 heart conditions and anxiety, in your blood.

Quick summary

["Knowing your propranolol levels helps doctors monitor your dose and adjust treatment as needed."]

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

Key facts at a glance

LOINC
47899-0
Short code
GH 2.5h p propranolol+Gc SerPl-aCnc
Synonyms
GH 2.5h p propranolol+Gc SerPl-aCnc
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 Is Done

Your doctor may order this test to check if your propranolol levels are within the safe range. This helps prevent side effects like low blood pressure or too much medication in your system. It may also be used to confirm whether you’re absorbing the medication properly or if you need adjustments.

What to Expect Before the Test

No special preparation is usually needed. You may have a small needle inserted into your arm or a blood sample drawn from a vein. If you’re taking propranolol, it’s important to tell your healthcare provider so they can track your levels accurately.

What the Results Mean

Results help your doctor determine if your dose is working as intended. Very high or very low levels might mean your medication isn’t being absorbed correctly, or you may need a different dose. Always discuss results with your healthcare provider.

Common Reasons for Testing

Doctors may test propranolol levels if you’re experiencing symptoms like dizziness, fatigue, or irregular heartbeat, even if you’re taking the medication as prescribed. It can also be used during pregnancy or if you’re taking other medications that might interact with propranolol.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Serum/Plasma Propranolol Level

Frequently asked questions

What could cause abnormal results?
Abnormally high levels might indicate poor medication compliance, liver issues, or incorrect dosing. Abnormally low levels could suggest the medication isn’t working as expected, or you may need a higher dose. Other factors, like liver disease or certain foods, can also affect how your body processes propranolol.
How long will results take?
Results are typically available within a few days, depending on your lab’s processing time. Your doctor will contact you once they have the results to discuss them further.
Can I eat or drink before the test?
You can eat and drink normally before the test unless your doctor instructs otherwise. Avoiding alcohol or certain medications (like grapefruit juice) for 24 hours before testing may help ensure more accurate results.
  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