Normal value of PCT
Sep 13, 2022
Source: Cainiu Health
Dr. Jiang Weimin
Introduction
PCT, also known as procalcitonin, is a sensitive marker for bacterial infection. It begins to rise 2 to 4 hours after the body experiences an infectious inflammation, reaching peak levels at 24 to 48 hours. Its half-life is generally 12 to 24 hours, and it remains highly stable in serum, unaffected by hormonal levels in the body. The normal value is below 0.1 ng/L; when levels are below 0.1 ng/L, antibiotic use is not recommended.
Procalcitonin (PCT) is a protein whose plasma levels rise during severe bacterial, fungal, or parasitic infections, sepsis, and multi-organ failure. So, what is the normal PCT value?
Normal PCT Value
PCT, also known as procalcitonin, is a sensitive indicator of bacterial infection. It begins to increase 2 to 4 hours after infection or inflammation, peaks at 24 to 48 hours, and typically has a half-life of 12 to 24 hours. It remains highly stable in serum and is unaffected by hormonal levels in the body. The normal value is below 0.1 ng/L. Antibiotics are not recommended when levels are below 0.1 ng/L. When levels exceed 0.5 ng/L, bacterial infection should be considered, and antibiotics may be appropriately used based on clinical symptoms and complete blood count results.
Elevated procalcitonin indicates active systemic inflammatory response. Factors affecting procalcitonin levels include the size and type of infected organ, bacterial species, severity of inflammation, and immune response status. Increased procalcitonin levels may result from severe shock, systemic inflammatory response syndrome (SIRS), or multiple organ dysfunction syndrome (MODS).
In severe pneumonia, major burns, or complex trauma, PCT levels range from 0.5 to 2 μg/L. When the body suffers severe bacterial infection leading to sepsis or multiple organ failure, PCT levels exceed 2 μg/L. We hope this answer helps you. Wishing you good health and happiness!
