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Procalcitonin (PCT)

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Procalcitonin (PCT) Test

The Procalcitonin (PCT) Test measures the level of procalcitonin, a protein that increases significantly in response to bacterial infections and sepsis. It is a valuable marker for distinguishing between bacterial and viral infections and assessing the severity of infections.

Why is the Test Done?

✅ Diagnose and monitor sepsis (life-threatening bacterial infection in the blood)
✅ Differentiate between bacterial and viral infections (bacterial infections cause high PCT, viral infections usually do not)
✅ Assess the severity of pneumonia, meningitis, and other systemic infections
✅ Guide antibiotic therapy (helps decide if antibiotics are needed or when to stop them)
✅ Monitor response to treatment in severe infections

Normal & Elevated Procalcitonin Levels

Procalcitonin Level (ng/mL) Clinical Significance
< 0.05 ng/mL Normal (no significant infection)
0.05 – 0.5 ng/mL Possible mild infection, mostly viral
0.5 – 2.0 ng/mL Suggestive of bacterial infection, moderate risk of sepsis
2.0 – 10.0 ng/mL High likelihood of sepsis or severe bacterial infection
> 10.0 ng/mL Strong evidence of severe sepsis or septic shock

📌 Key Point:

  • Viral infections, mild bacterial infections, and non-infectious conditions usually do not elevate PCT significantly.

Causes of Elevated Procalcitonin

Infections (Common Causes)

🔴 Bacterial Sepsis & Severe Infections – Major cause of high PCT
🔴 Pneumonia (Bacterial, Not Viral)
🔴 Urinary Tract Infections (UTIs) with Sepsis
🔴 Meningitis (Bacterial, Not Viral)
🔴 Peritonitis (Abdominal Infection)

Non-Infectious Causes (Less Common)

🔹 Severe Trauma, Burns, or Surgery – Inflammatory response can raise PCT
🔹 Pancreatitis (Severe Cases)
🔹 Organ Failure (Liver, Kidney Dysfunction)
🔹 Some Cancers (Medullary Thyroid Carcinoma, Neuroendocrine Tumors)

Causes of Low or Normal Procalcitonin in Infection

✔ Viral Infections – COVID-19, influenza, dengue, etc.
✔ Localized Infections – Minor skin infections or mild urinary infections
✔ Autoimmune Conditions – Rheumatoid arthritis, lupus, etc.

Procalcitonin vs. Other Inflammatory Markers

Marker Used For Key Differences
Procalcitonin (PCT) Bacterial infections, sepsis Rises quickly (within 6 hours), decreases with treatment
C-Reactive Protein (CRP) General inflammation Rises in both bacterial & viral infections
White Blood Cell (WBC) Count General infections Less specific, may rise in many conditions

📌 Why PCT?

  • PCT specifically indicates bacterial infections, whereas CRP and WBC can increase in viral and inflammatory conditions too.

Next Steps Based on Results

🔬 Additional Tests May Be Ordered:

  • Blood Cultures – To identify the bacteria causing the infection
  • CRP, WBC Count – To assess overall inflammation
  • Chest X-ray or CT Scan – If pneumonia or severe infection is suspected

💊 Treatment & Management:

  • If PCT is high (>0.5 ng/mL): Likely bacterial infection → Start antibiotics
  • If PCT is very high (>2 ng/mL): Suggests sepsis → Urgent medical care needed
  • If PCT is low (<0.05 ng/mL): No bacterial infection → Antibiotics may not be necessary

Original price was: ₹2,300.00.Current price is: ₹1,999.00.

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