Diagnostics·Diagnostics
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Procalcitonin is a protein your body makes when you have a serious bacterial infection. A simple blood test measures its level to help doctors tell bacterial infections from viral ones. This helps them decide whether to use antibiotics.
Key facts
Procalcitonin testing is becoming more common, especially to guide antibiotic treatment in hospitals.
The test is used for people of any age who have symptoms of infection, such as fever, chills, rapid breathing, or confusion. It is particularly helpful when doctors suspect sepsis.
A blood sample is taken from a vein in your arm and sent to a laboratory. The lab measures the level of procalcitonin in your blood. Results usually come back within a few hours.
A healthcare worker will draw blood from a vein. You may feel a brief prick and have a small bruise afterward. Your doctor will explain your results and what they mean for your treatment plan.
Treatment is directed at the underlying infection, not the procalcitonin level itself. If procalcitonin is high (indicating a bacterial infection), antibiotics are often prescribed. If it is low, antibiotics may be avoided to prevent overuse.
For bacterial infections, doctors prescribe antibiotics. The choice depends on the type of infection and your overall health. For severe infections, intravenous antibiotics given in hospital may be needed. Your doctor will adjust treatment as your procalcitonin level changes.
Surgery may be needed to drain an abscess or remove infected tissue that does not respond to antibiotics.
After a serious infection, recovery can take time. Rest as needed and gradually return to normal activities. Finish all antibiotics even if you feel better, and attend follow-up appointments.
Eat a balanced diet with plenty of fruits, vegetables, and lean protein to support your immune system. Gentle exercise, like walking, can help you regain strength. Do not overexert yourself while recovering.
Serious infections can be stressful. It is normal to feel anxious, tired, or down. Talk to your healthcare team about how you are feeling. Support from family and friends can also help.
Many infections can be prevented with good hygiene, vaccination, and appropriate wound care. Procalcitonin testing itself does not prevent infection, but it helps ensure antibiotics are used wisely.
Vaccines such as those for flu, pneumonia, and whooping cough reduce your risk of serious bacterial infections.
There is no routine screening for procalcitonin. It is used as a diagnostic test when a serious infection is suspected.
With early detection and proper treatment, most bacterial infections improve. Procalcitonin levels fall as the infection clears. Your doctor will monitor your progress and adjust treatment as needed. Most people make a full recovery.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 9, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.