Overview: Procalcitonin TestIntroduction: The Procalcitonin Test measures procalcitonin to diagnose sepsis or infections, causing fever or fatigue. Following 2023 IDSA guidelines, it uses biochemical methods for high specificity, supporting infection screening. This test is critical for guiding diagnosis, treatment planning, and improving outcomes in biochemistry for patients with suspected bacterial infections or sepsis.
Other Names: Procalcitonin Assay, PCT Test.
FDA Status: Laboratory-developed test (LDT), meeting biochemistry standards for diagnostic accuracy.
Historical Milestone: Procalcitonin testing began in the 1990s with sepsis biomarker research. Biochemical methods improved in the 2000s, enhancing diagnostic precision.
Purpose: Measures procalcitonin to diagnose sepsis or infections, guides treatment, and evaluates patients with fever or fatigue.
Test Parameters: 1. Procalcitonin Level
Pretest Condition: No fasting required. Collect serum or plasma. Report history of fever, fatigue, or infection symptoms.
Specimen: Serum (SST, 2-5 mL), Plasma (EDTA, 2-4 mL). Transport in a biohazard container.
Sample Stability at Room Temperature: 8 hours
Sample Stability at Refrigeration: 7 days
Sample Stability at Frozen: 6 months
Medical History: Document fever, fatigue, or history of infections. Include current medications, especially antibiotics.
Consent: Written consent required, detailing the tests purpose, sepsis/infection implications, and risks of sample collection.
Procedural Considerations: Uses immunoassays to measure procalcitonin levels. Results are available in 1-2 days, supporting clinical decisions. Performed in laboratories, often for sepsis or infection diagnosis.
Factors Affecting Result Accuracy: Sample hemolysis or improper storage can affect results. Non-bacterial infections may cause false negatives.
Clinical Significance: Elevated procalcitonin confirms bacterial sepsis or infection, guiding antibiotic therapy. Normal levels may suggest viral infection or require further testing.
Specialist Consultation: Consult an infectious disease specialist or internist for result interpretation and treatment planning.
Additional Supporting Tests: Blood cultures, C-reactive protein, or lactate levels to confirm sepsis/infection diagnosis.
Test Limitations: Non-specific for certain infections; clinical correlation is needed. Sample quality affects sensitivity.
References: IDSA Sepsis Guidelines, 2023; Clinical Infectious Diseases, Schuetz P, 2022.
