Beta-blocker (Cardiac) Drug Concentration, Serum/Plasma
This test measures the level of a medication used to manage heart rhythm, blood pressure, or chest pain (angina). It helps ensure your dose is effective and safe.
["This test helps doctors check if your beta-blocker medication is working properly."]
Key facts at a glance
- LOINC
- 73549-8
- Short code
- Acebutolol ind plt IgG SerPl Ql FC
- Synonyms
- Acebutolol ind plt IgG 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 for conditions like high blood pressure, heart rhythm disorders, or chest pain. Your doctor may order this test to verify your medication levels, especially if you’re taking a specific beta-blocker like acebutolol. Abnormal levels can indicate whether your dose is too high or too low, which may affect your symptoms or side effects.
What to Expect Before the Test
No special preparation is usually needed unless your doctor instructs otherwise. You may have a small needle inserted into your arm or a blood sample drawn from a vein. The process is quick and typically painless. If you’re on a blood thinner, your doctor may advise against fasting or other restrictions.
What the Results Mean
Results are used to guide your treatment. Low levels might mean your medication isn’t strong enough, while high levels could signal potential side effects. Your doctor will discuss these results with you and may adjust your dose if needed.
Common Reasons for Testing
Doctors may order this test if you’re on a beta-blocker for a long time, if you have symptoms like dizziness, fatigue, or unexplained low blood pressure, or if you’re experiencing side effects like shortness of breath or slow heartbeat.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Monitoring beta-blocker levels is critical because these medications can affect heart rate and blood pressure. Too little medication may not control your condition effectively, while too much can cause serious side effects like heart failure or low blood pressure. Regular testing helps balance safety and effectiveness.
Short name
Beta-blocker level
Frequently asked questions
What happens if my test results are low?
How often should I get this test?
Can I eat or drink before the 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