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Antibiotic (ertapenem) concentration in body fluids by mass concentration

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

This test measures the amount of ertapenem, a broad-spectrum antibiotic, in your blood or other fluids to check how well it’s working and to ensure safe dosing.

Quick summary

["This test helps doctors monitor antibiotic effectiveness and prevent overuse or harm."]

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

Key facts at a glance

LOINC
101486-9
Short code
Ertapenem Bld Pos MIC.VOC det
Synonyms
Ertapenem Bld Pos MIC.VOC det
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
mic-voc-detection
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your doctor may order this test if you’re receiving ertapenem treatment for serious infections, such as bloodstream or abdominal infections. It helps ensure the right amount of medicine is in your body to fight bacteria without causing side effects.

What to Expect Before the Test

No special preparation is needed. Blood is drawn from a vein in your arm, or fluid may be collected from another source like urine or cerebrospinal fluid, depending on your condition. You may feel a brief pinch, but it’s usually over quickly.

What the Test Results Mean

Results show the concentration of ertapenem in your fluids. Low levels may mean the antibiotic isn’t working well, while very high levels could indicate side effects or improper dosing. Your doctor will interpret these results in the context of your treatment plan.

Possible Side Effects or Risks

Antibiotics like ertapenem can cause mild side effects such as nausea, diarrhea, or allergic reactions in some people. Rarely, they may affect kidney function or cause infections at the injection site. Always discuss any concerns with your healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

ERTapenem Level

Frequently asked questions

How often should I get this test?
Your doctor will determine the timing based on your treatment plan, but it’s often done during or shortly after starting ertapenem therapy to check levels and adjust doses as needed. Follow-up tests may continue until your infection is fully treated.
Can I drink water before the test?
Yes, you can drink water unless your doctor specifies otherwise. Avoid caffeine or alcohol before the blood draw, as they might affect test results.
What if my test results are abnormal?
If your ertapenem levels are too low, your doctor may increase your dose or switch to a different antibiotic. If levels are too high, they may adjust your treatment to prevent side effects. Always discuss results with your healthcare team.
  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