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Propranolol (Serum/Plasma Concentration)

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

This test measures the amount of propranolol, a medication used to control heart rate and blood pressure, in your blood.

Quick summary

["Knowing your propranolol level helps doctors check if your dose is working properly."]

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

Key facts at a glance

LOINC
73186-9
Short code
Propranolol ind plt IgM SerPl Ql FC
Synonyms
Propranolol 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

Why This Test Is Done

Your doctor may order this test if you’re taking propranolol to manage conditions like high blood pressure, irregular heartbeat, or anxiety. It helps ensure the medication is at an effective level without causing unwanted side effects.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the blood draw if your doctor specifies it. Bring your medication list to confirm the test is for propranolol.

What Happens During the Test

A healthcare provider will draw blood from a vein in your arm. The sample is sent to a lab for measurement using a sensitive immunoassay method.

What the Results Mean

Results are compared to a general reference range for propranolol, but your specific target may differ based on your condition and doctor’s instructions. Low levels may mean the medication isn’t working, while high levels could signal toxicity.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Monitoring Medication Effectiveness

Short name

Beta-Blocker Blood Level

Frequently asked questions

Why might my doctor want to check my propranolol level?
Your doctor may check your propranolol level to ensure it stays within the safe range for your condition. For example, they might monitor it if you have heart problems, have had recent changes in your dose, or are experiencing unusual symptoms like dizziness or fatigue.
What happens if my propranolol level is too high or too low?
High levels could cause side effects like slow heart rate, confusion, or breathing difficulties. Low levels might mean your medication isn’t controlling your symptoms effectively. Your doctor will adjust your dose based on the results.
Can I eat or drink before this test?
Check with your doctor first, as some tests require fasting. If fasting isn’t needed, you can eat and drink normally, but avoid grapefruit juice, which can affect propranolol metabolism.
  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