Antibiotic (Amoxicillin) Level in Plasma
This test measures the amount of the antibiotic amoxicillin in your blood plasma to check if it’s working properly and at the right level.
["This test helps ensure your antibiotic treatment is effective and safe."]
Key facts at a glance
- LOINC
- 73526-6
- Short code
- Amoxicillin ind plt IgM SerPl Ql FC
- Synonyms
- Amoxicillin 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 healthcare provider may order this test if you’re taking amoxicillin (a penicillin antibiotic) to treat or prevent bacterial infections. It helps monitor whether the medication is reaching the right amount in your blood to fight the infection without causing harmful side effects.
What to Expect Before the Test
No special preparation is usually needed. You may be asked to fast for a few hours before the test, but this isn’t always required. Bring a list of all medications you’re taking, including over-the-counter drugs and supplements, as they can affect test results.
How the Test Is Done
A healthcare professional will draw blood from a vein in your arm using a small needle. The blood sample will be sent to a lab for testing. The plasma portion of your blood is analyzed to measure amoxicillin levels.
What the Results Mean
Results are typically reported as a concentration (e.g., micrograms per milliliter). Your results will be compared to your healthcare provider’s target range, which depends on your condition, dosage, and other factors. If levels are too low, your dose may need adjustment. If levels are too high, it could indicate side effects or improper absorption.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Amoxicillin levels help ensure the antibiotic is effective against the infection while minimizing risks like allergic reactions or drug resistance. Low levels may mean the infection isn’t fully treated, while high levels could signal toxicity or incorrect dosing. This test is especially important for patients with kidney issues or those taking other medications that interact with amoxicillin.
Short name
Amoxicillin Plasma Level
Frequently asked questions
How long does it take to get my test results?
Can I eat or drink before this test?
What should I do if I miss my scheduled blood draw?
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