Timolol Concentration in Plasma
This test measures the amount of timolol, a beta-blocker medication, in your blood plasma. It helps your healthcare provider assess your drug levels and adjust your treatment if needed.
["This test helps monitor your beta-blocker medication levels for safety and effectiveness."]
Key facts at a glance
- LOINC
- 73118-2
- Short code
- Timolol ind plt IgM SerPl Ql FC
- Synonyms
- Timolol 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 Is This Test Done?
Your doctor may order this test if you’re taking timolol (a medication used to treat high blood pressure, angina, or certain heart rhythm issues) and want to check whether your body is absorbing and processing it correctly. It can also help ensure you’re not at risk of too much or too little medication in your system.
What to Expect Before the Test
No special preparation is usually needed, but you may be asked to fast for a few hours before the test if your blood is drawn early in the morning. Wear a loose shirt for easy access to your arm. Bring a list of all medications you take, including over-the-counter drugs and supplements, as they can affect results.
What Happens During the Test?
A healthcare professional will insert a small needle into your arm to draw a blood sample. The process is quick and typically causes only minor discomfort. The blood will be sent to a lab for analysis.
What the Results Mean
Results show the concentration of timolol in your plasma. High levels may indicate improper metabolism or dosing, while very low levels could suggest poor absorption. Your doctor will interpret the results in the context of your medical history and symptoms.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Timolol levels help prevent side effects like low blood pressure, heart palpitations, or reduced heart function. If levels are too high, your doctor may adjust your dose or monitor you closely. If levels are too low, they may recommend increasing your medication or checking for interactions with other drugs.
Short name
Timolol Level
Frequently asked questions
How long does it take to get my test results?
Can I eat or drink before this test?
Will this test affect my medication?
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