Professional-grade diagnostic kits for the rapid and semi-quantitative detection of Procalcitonin (PCT) in whole blood, serum, or plasma. This high-sensitivity biomarker is a critical tool for the early diagnosis of bacterial sepsis, severe infections, and for monitoring antibiotic therapy effectiveness. Designed for emergency departments, intensive care units (ICU), and clinical laboratories, providing reliable results within 10–15 minutes to assist in immediate clinical intervention.