Identifies the exact bacteria causing an infection and which antibiotics will treat it effectively.
A Culture & Sensitivity (C&S) test grows bacteria (or other microorganisms) from a sample — such as urine, blood, wound swab or other body fluid — in the laboratory to identify exactly which organism is causing an infection. Once identified, the organism is tested against a panel of antibiotics to determine which ones are effective (sensitive) and which are not (resistant).
This test is important because it moves treatment from a general guess to an evidence-based choice — helping your doctor prescribe the antibiotic most likely to work for your specific infection, while avoiding unnecessary or ineffective antibiotic use.
Because bacteria need time to grow in culture, this test typically takes longer than most other laboratory tests — often 48–72 hours — though preliminary findings may sometimes be available sooner.
| Aspect | Details |
|---|---|
| Duration | Sample collection is quick; culture growth and sensitivity testing typically takes 48–72 hours |
| Preparation | Ideally, the sample should be collected before starting antibiotics, as prior antibiotic use can affect results; follow your doctor's guidance |
| What Happens | A sample (urine, blood, swab or other fluid) is collected and placed in a culture medium to allow any bacteria present to grow, followed by antibiotic sensitivity testing |
| Pain/Discomfort | Depends on the sample type — a blood draw involves a brief pinch, while a swab or urine sample is generally painless |
Culture & Sensitivity testing is recommended when an infection needs to be precisely identified and matched to the right antibiotic treatment.
Common Reasons
| Also Used For
|
Precise, Evidence-Based TestingIdentifies the exact organism causing infection rather than relying on general assumptions. | Antibiotic Sensitivity PanelTests the organism against multiple antibiotics to guide the most effective treatment choice. | |
Supports Responsible Antibiotic UseHelps avoid unnecessary or ineffective antibiotics, supporting better treatment outcomes. | Doctor-Guided Treatment PlanResults are reviewed with your doctor to finalise or adjust your treatment based on the specific findings. | |
Because it requires giving any bacteria present time to grow in a controlled laboratory environment before they can be identified and tested against antibiotics — this growth process typically takes 48–72 hours.
Ideally, the sample should be collected before starting antibiotics, since prior antibiotic use can suppress bacterial growth and affect the accuracy of results. Discuss timing with your doctor, especially if you need urgent treatment.
It indicates which antibiotics are likely to be effective ('sensitive') against the specific bacteria found in your sample, and which are not ('resistant') — this guides your doctor's antibiotic choice.
Not always. Many common infections are treated based on typical patterns without needing a culture. It's particularly useful for infections that are severe, recurrent, not responding to initial treatment, or where precise identification matters.
Precise identification of infection-causing organisms and effective antibiotic guidance, at Apollo Clinic, Shyamnagar.
Disclaimer: The information on this page is general and is not a substitute for a consultation with a qualified physician. Laboratory results should always be interpreted by a doctor in the context of your full clinical picture and symptoms. Sample collection and testing are performed by trained laboratory staff following standard protocols.
