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Antibiotic Concentration in Plasma (Tazobactam)

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

This test measures the amount of the antibiotic tazobactam in your blood plasma. It helps doctors determine if your dose is working effectively and adjusts treatment as needed.

Quick summary

["This test helps ensure your antibiotic is at the right level for your infection."]

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

Key facts at a glance

LOINC
72943-4
Short code
Tazobactam (neut) IgM SerPl Ql FC
Synonyms
Tazobactam (neut) IgM 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) to treat serious infections, such as those caused by bacteria like *Neisseria gonorrhoeae* or certain *Pseudomonas* strains. It helps monitor how well your body is responding to the medication and prevents potential resistance or side effects.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or vein to draw a blood sample. The process is quick and usually painless. If you’re on blood thinners, let your doctor know before the test.

What the Results Mean

Results show the concentration of tazobactam in your plasma. Higher-than-expected levels may indicate poor absorption or kidney issues, while very low levels could mean the infection isn’t responding. Your doctor will interpret these results in the context of your treatment plan.

Common Reasons for Testing

This test is most commonly used in hospitalized patients with severe infections, surgical procedures requiring broad-spectrum antibiotics, or those with kidney problems that may affect drug clearance.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Ensuring Effective Antibiotic Therapy

Short name

Tazobactam Level

Frequently asked questions

Will I feel any side effects from the blood draw?
Most people experience only mild discomfort or a brief sting at the injection site. Some may feel lightheaded or dizzy if they stand up too quickly after drawing blood. Rarely, there may be bruising or swelling at the site.
How often will I need this test?
The frequency depends on your treatment plan. Some patients need testing daily or every few days during active infection, while others may only need it once if their condition stabilizes.
Can I stop taking tazobactam if my test results look normal?
No, you should never stop or adjust your medication without consulting your doctor. Even if results appear normal, your doctor may continue monitoring to prevent resistance or ensure the infection is fully treated.
  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