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Antibiotic Concentration (Tazobactam) in Serum/Plasma

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of the antibiotic tazobactam in your blood, which helps doctors check if it’s working properly in your treatment.

Quick summary

["Tazobactam levels help ensure your infection is being effectively treated with this medication."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
72944-2
Short code
Tazobactam (neut) IgG SerPl Ql FC
Synonyms
Tazobactam (neut) IgG SerPl Ql FC
Category
chemistry
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

Doctors may order this test if you’re taking tazobactam (often combined with piperacillin, like Zosyn) to monitor your response to the medication. It helps prevent antibiotic resistance or side effects by confirming the correct dose is reaching your bloodstream.

What to Expect Before the Test

No special preparation is needed. You’ll likely have a small needle inserted into your arm or vein to draw a blood sample. The process is quick and usually painless.

What the Results Mean

Results show the concentration of tazobactam in your blood. While exact ranges depend on your treatment plan, doctors use these levels to adjust your dose if needed. Low levels may mean the medication isn’t working well, while very high levels could signal potential side effects.

Possible Side Effects or Considerations

Tazobactam is generally safe, but high levels might cause nausea, diarrhea, or allergic reactions. If you experience severe symptoms, contact your doctor immediately.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Tazobactam Level

Frequently asked questions

Why might my doctor want to check my tazobactam levels?
Your doctor may order this test if you’re receiving tazobactam (often combined with piperacillin) to confirm the medication is effective against your infection and to avoid resistance or toxicity. It’s especially important for patients with kidney issues or those receiving long-term treatment.
What happens if my tazobactam levels are too low?
If levels are too low, your infection may not be fully treated. Your doctor might adjust your dose or switch to a different antibiotic to ensure you receive the full therapeutic effect.
Can I eat or drink before this test?
You can eat and drink normally before the test, as it’s a simple blood draw with no dietary restrictions.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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