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Also reported in: mcg/L
Normal procalcitonin below 0.1 ng/mL is consistent with no significant systemic bacterial infection is producing PCT above baseline. This is the major clinical utility of PCT — at normal levels, antibiotics for systemic bacterial infection are generally not indicated. PCT may still be slightly elevated in some non-bacterial conditions but remains below clinically actionable thresholds.
Procalcitonin is a highly specific marker for bacterial infection. In healthy individuals without significant bacterial infection, PCT is nearly undetectable. An undetectable PCT is a powerful argument against serious systemic bacterial infection. This is the ideal baseline result and is very reassuring against bacterial sepsis.
Excellent result. Bacterial infection is very unlikely based on this marker.
Procalcitonin: {{value}} {{unit}} — undetectable (ref: <{{high}})A very low procalcitonin strongly argues against significant systemic bacterial infection. PCT is produced by tissues throughout the body in response to bacterial toxins and is very specific for bacterial (rather than viral) infection. Low PCT combined with normal CRP and temperature provides strong evidence against serious bacterial illness.
Reassuring result. Serious bacterial infection is unlikely. If symptoms suggest viral illness, PCT helps avoid unnecessary antibiotic treatment.
Procalcitonin: {{value}} {{unit}} — very low (ref: <{{high}})A borderline low PCT is entirely within the normal range and is consistent with no significant bacterial infection signaling. At this level, antibiotic therapy is generally not indicated on the basis of PCT alone. PCT is used clinically to guide antibiotic prescribing and reduce unnecessary antibiotic courses.
No action needed from bacterial infection standpoint. Good indicator supporting antibiotic avoidance if infection is clinically uncertain.
Procalcitonin: {{value}} {{unit}} — low normal (ref: <{{high}})Normal procalcitonin below 0.1 ng/mL is consistent with no significant systemic bacterial infection is producing PCT above baseline. This is the major clinical utility of PCT — at normal levels, antibiotics for systemic bacterial infection are generally not indicated. PCT may still be slightly elevated in some non-bacterial conditions but remains below clinically actionable thresholds.
Normal result. Bacterial infection requiring systemic antibiotics is unlikely based on this marker.
Procalcitonin: {{value}} {{unit}} — normal (ref: <{{high}})An optimal procalcitonin below 0.05 ng/mL provides the strongest evidence against systemic bacterial infection. At this level, PCT-guided antibiotic therapy guidelines universally recommend against starting antibiotics for suspected infection. This marker has high specificity for bacterial infection, making a very low result very informative.
Excellent result. No bacterial infection concern. Continue standard care.
Procalcitonin: {{value}} {{unit}} — optimal (ref: <0.05)A borderline elevated PCT between 0.1 and 0.5 ng/mL suggests possible early or mild systemic bacterial infection, though viral infection, major surgery, noticeable trauma, or autoimmune disease can also produce mild PCT elevation. This range is considered a 'gray zone' where the probability of significant bacterial infection is uncertain but warrants careful clinical observation.
Clinical evaluation is needed. Symptoms, temperature, blood counts, and CRP together with PCT will determine whether antibiotic treatment is appropriate.
Procalcitonin: {{value}} {{unit}} — borderline elevated (ref: <{{high}}; borderline: 0.1–0.5)A PCT above 0.5 ng/mL is a significant clinical finding suggesting probable systemic bacterial infection. At this level, PCT-guided protocols typically support starting antibiotic treatment. The higher the PCT, the more confident the bacterial cause. Common may contribute to include bacterial pneumonia, urinary tract infection with systemic spread, abdominal infection, or early sepsis.
Seek medical evaluation urgently. Antibiotic therapy and investigation of the infection source (blood cultures, urine culture, imaging) are typically initiated at this PCT level.
Procalcitonin: {{value}} {{unit}} — elevated — probable bacterial infection (ref: <{{high}}; elevated: >0.5)A very high PCT above 10 ng/mL is a hallmark of noticeable sepsis or bacterial septic shock. At this level, bacterial infection has spread systemically and is causing life-threatening organ dysfunction. PCT in this range is associated with high mortality without immediate, aggressive treatment. The magnitude of PCT elevation correlates with severity of sepsis.
This is a life-threatening medical emergency. Go to the hospital immediately. Immediate blood cultures, intravenous broad-spectrum antibiotics, fluid resuscitation, and intensive monitoring are required urgently.
Procalcitonin: {{value}} {{unit}} — very high (ref: <{{high}}; critical: >10)Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.