Procalcitonin Test
A blood test that helps tell bacterial infections from other causes of inflammation and guides antibiotic use.
Quick Summary
In hospital, to support decisions about antibiotics in suspected bacterial infection and sepsis.
Procalcitonin level.
No preparation.
Overview
Procalcitonin rises more in bacterial infections than viral ones.
It's used alongside clinical judgement.
What It Measures
Procalcitonin
Blood level.
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.
Reference Ranges
Note: Normal ranges vary by laboratory. Consult your report for the specific reference used.
| Parameter | Typical Range (Adult) | Units |
|---|---|---|
| Procalcitonin | Below 0.1 | ng/mL |
Interpreting Results & Next Steps
Discuss with Doctor
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:
Higher levels make bacterial infection or sepsis more likely.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Procalcitonin Test(opens in a new tab) · MedlinePlus, US National Library of Medicine