Skip to content

Microbiological Culture and Sensitivity with Antimicrobial Susceptibility Testing (Serum/Plasma)

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

This test checks for the presence of bacteria in your blood or plasma and determines how your body responds to antibiotics.

Quick summary

["Helps identify infections and guide antibiotic treatment choices."]

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

Key facts at a glance

LOINC
50545-3
Short code
Bacterial Susc Pnl Islt MIC
Synonyms
Bacterial Susc Pnl Islt MIC
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
mic
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

What This Test Measures

The test involves growing bacteria from your blood or plasma sample to identify any pathogens present. It also evaluates how different antibiotics might affect those bacteria, ensuring the chosen treatment is effective.

Why It’s Ordered

Your healthcare provider may order this test if you have signs of a serious blood infection (sepsis), fever of unknown origin, or other symptoms suggesting bacterial contamination.

Sample Collection and Preparation

A blood sample is drawn, and bacteria are cultured in a lab setting. Antibiotics are then tested against the isolated bacteria to assess susceptibility.

Interpreting Results

Results typically show whether bacteria were detected and, if so, which antibiotics are most effective against them. This helps tailor your treatment plan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for managing infections by confirming bacterial presence and guiding antibiotic therapy to prevent resistance and improve recovery.

Short name

Bacterial Culture & Antibiotic Response

Frequently asked questions

How long will it take to get results?
Results can take several days to a week, depending on the growth of bacteria and testing methods. Follow-up may require additional samples or consultations.
Can I take antibiotics before this test?
Yes, but it’s important to inform your doctor about any antibiotics you’ve taken recently, as they may affect test results or interpretation.
Does this test require fasting?
No fasting is required for this test, as it involves a blood sample for bacterial culture and susceptibility testing.
  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