Beta-blocker (Cardiac) Drug Concentration, Serum/Plasma
This test measures the level of a beta-blocker medication in your blood to check if it’s working properly and at the right dose.
["Your doctor uses this to adjust your medication for heart health."]
Key facts at a glance
- LOINC
- 73548-0
- Short code
- Acebutolol ind plt IgM SerPl Ql FC
- Synonyms
- Acebutolol 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 Matters
Beta-blockers are medications often prescribed to manage heart conditions like high blood pressure, heart failure, or irregular heart rhythms. They work by slowing your heart rate and reducing stress on your heart. This test helps ensure your medication is at the correct level to control symptoms safely without causing side effects.
What to Expect Before the Test
No special preparation is needed for this test. You may have a small needle inserted into your arm or a tube inserted into your vein to draw blood. It usually takes a few minutes. If you’re on a beta-blocker, your doctor may ask you to stop it temporarily before the test, depending on your condition.
What the Results Mean
Results help your doctor determine if your medication is effective. Low levels may mean your dose isn’t working well, while high levels could indicate side effects or improper dosing. Your doctor will discuss these results with you and may adjust your medication if needed.
Common Reasons for This Test
Doctors order this test if you’re taking a beta-blocker to check if it’s working as intended. It may also be done if you have symptoms like dizziness, fatigue, or irregular heartbeat that suggest your medication isn’t at the right level.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Beta-blockers are critical for managing heart-related conditions, but their effectiveness depends on maintaining the correct blood concentration. Abnormally low levels may lead to inadequate heart protection, while excessively high levels can cause side effects like slow heart rate, fatigue, or breathing difficulties. Regular monitoring ensures your medication remains safe and effective for your heart health.
Short name
Beta-blocker level
Frequently asked questions
Will I feel any pain or discomfort?
How long will it take to get my results?
Can I eat or drink before this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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