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Quinupristin/Dalfopristin Serum Concentration (Pharmacokinetic)

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

This test measures the amount of the antibiotic quinupristin/dalfopristin in your blood, typically taken to monitor drug levels when you’re receiving this medication through an IV.

Quick summary

This test helps ensure the right amount of the antibiotic is in your blood to fight infections safely and effectively.

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

Key facts at a glance

LOINC
58712-1
Short code
Quinupristin+Dalfoprist Islt SlowMyco
Synonyms
Quinupristin+Dalfoprist Islt SlowMyco
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
method-for-slow-growing-mycobacteria
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 receiving quinupristin/dalfopristin (e.g., Synercin) as part of a treatment plan for serious infections, such as bacterial endocarditis or skin/soft tissue infections. It helps adjust your dosage to avoid toxicity or insufficient effectiveness.

What to Expect Before the Test

No special preparation is needed. A blood sample will be taken from a vein in your arm, usually during a routine clinic or hospital visit. The process is quick and typically painless.

What the Test Results Mean

Results help determine if your antibiotic levels are within the target range for your condition. Too low may mean the infection isn’t fully treated, while too high could increase side effects. Your provider will discuss these results with you.

Common Uses of This Test

This test is primarily used to monitor therapeutic drug levels, ensuring optimal dosing for effective infection control while minimizing risks. It’s not a diagnostic test for infections themselves.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Balancing Treatment and Safety

Short name

Quinupristin/Dalfopristin Levels

Frequently asked questions

Why might my doctor want to check my quinupristin/dalfopristin levels?
Your doctor may order this test if you’re receiving this antibiotic through an IV for a serious infection, as blood levels can vary based on your metabolism, kidney function, and other factors. Proper monitoring helps prevent complications like drug resistance or toxicity.
How often will I need this test?
The frequency depends on your treatment plan. Some patients may need blood tests every few days, while others may have them less often. Your healthcare provider will schedule it based on your specific needs and response to treatment.
What are the typical side effects of quinupristin/dalfopristin?
Common side effects may include mild nausea, pain at the injection site, or rash. Severe reactions (e.g., allergic reactions) are rare but require immediate attention. Always report any unusual symptoms to your provider.
  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