Blood Culture
A test that checks for bacteria or fungi growing in the blood.
Quick Summary
To diagnose serious infections such as sepsis and typhoid, and choose the right antibiotic.
Growth of bacteria or fungi from blood samples.
Ideally taken before antibiotics; usually two sets from different sites.
Overview
Blood is placed in special bottles and incubated.
Positive results include which antibiotics will work.
What It Measures
Growth
Whether germs grow.
Sensitivity
Which antibiotics work.
How It's Performed
- 01
Preparation
Usually no special preparation. Tell the staff about medicines you take.
- 02
Blood sample
A small amount of blood is taken from a vein in your arm with a thin needle.
- 03
Afterwards
Press on the spot for a minute. A small bruise is common; you can go back to normal activities.
Interpreting Results & Next Steps
Discuss with Doctor
Results take one to five days. Normal ranges differ between laboratories, ages and sexes; always use the range printed on your report and ask your doctor what your results mean.
If values are High:
A positive culture shows a bloodstream infection.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Bacteria Culture Test(opens in a new tab) · MedlinePlus, US National Library of Medicine