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Serum/plasma concentration of propranolol (β-blocker medication)

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

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

Quick summary

["Helps ensure your dose is safe and effective."]

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

Key facts at a glance

LOINC
47917-0
Short code
GH 3h p propranolol+Gc SerPl-aCnc
Synonyms
GH 3h 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 healthcare provider may order this test if you’re taking propranolol to check if your dose is working properly. It can also help monitor for side effects or adjust your medication if needed.

What to Expect Before the Test

No special preparation is usually required. You may have a small needle inserted into a vein (typically in your arm) to draw blood. If you’re on a long-term medication like propranolol, your blood may be tested at regular intervals to track levels.

What the Results Mean

Results are compared to a general reference range for healthy individuals, but your specific range may vary based on your health and the reason for testing. Low levels might indicate insufficient medication, while high levels could signal side effects or improper absorption.

Common Reasons for Testing

Doctors test propranolol levels to confirm proper dosing for conditions like arrhythmias, hypertension, or migraines. It’s also used in patients with liver disease, where metabolism may be slower, requiring closer monitoring.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Propranolol levels help prevent dangerous side effects like heart rhythm issues or excessive drops in blood pressure. If levels are too low, your symptoms may not improve. If too high, you could experience dizziness, fatigue, or breathing problems. Always follow your provider’s guidance on timing and retesting.

Short name

Propranolol Level

Frequently asked questions

How often should I get this test?
Your provider will determine the timing based on your medication schedule, health needs, and how your body processes propranolol. Typically, tests are done 2–4 hours after taking the medication, but this can vary.
What if my results are outside the normal range?
If your levels are too low, your provider may adjust your dose or suggest alternative medications. If levels are too high, they may recommend reducing the dose, changing timing, or investigating other health factors that could affect absorption.
Can I eat or drink before this test?
You can usually eat and drink normally unless instructed otherwise. Some tests may require fasting, but this test does not.
  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