Aztreonam (Antibiotic) Level in Serum/Plasma
This test measures the amount of aztreonam, a medication used to treat bacterial infections, in your blood. It helps your healthcare provider check if the drug is working properly and at safe levels in your system.
["This test helps monitor antibiotic effectiveness and adjust treatment if needed."]
Key facts at a glance
- LOINC
- 73508-4
- Short code
- Aztreonam ind plt IgM SerPl Ql FC
- Synonyms
- Aztreonam 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 aztreonam to treat serious infections, such as those affecting the lungs, blood, or other parts of the body. It helps ensure the medication is reaching the right amount in your bloodstream to fight bacteria without causing harmful side effects.
How Is the Sample Collected?
A blood sample is taken from a vein in your arm by a healthcare professional. You may feel a small pinch when the needle is inserted, but the procedure usually takes less than five minutes.
What Should You Expect Before or After the Test?
No special preparation is needed for this test. You can eat, drink, or take your usual medications as usual. After the blood draw, you may experience mild bruising or soreness at the site, which should go away quickly.
How Long Does It Take to Get Results?
Results are typically available within 24 to 48 hours, depending on your lab’s processing schedule. Your doctor will discuss the findings with you during your follow-up visit.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
High levels of aztreonam in the blood may indicate poor absorption or increased metabolism of the drug, which could require dose adjustments. Low levels might suggest the infection isn’t responding well, prompting a change in treatment. Your doctor will use these results to tailor your care and avoid potential risks like antibiotic resistance or toxicity.
Short name
Aztreonam in Serum/Plasma
Frequently asked questions
Why might my doctor want to check my aztreonam levels?
What do my aztreonam test results mean?
Can I eat or drink anything 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