A newly approved diagnostic kit for heparin-binding protein (HBP) is offering clinicians a faster pathway to identify bacterial infections and sepsis, a condition where every hour of delayed treatment significantly increases mortality risk. The kit, which uses fluorescence immunochromatography, has received regulatory clearance in multiple jurisdictions as a Class II in vitro diagnostic device.

HBP is a protein stored in neutrophils and released within one to two hours of bacterial infection. Unlike traditional markers such as procalcitonin or C-reactive protein, HBP rises much earlier and correlates specifically with bacterial—rather than viral—infections. This rapid release kinetics gives clinicians a critical head start in distinguishing bacterial sepsis from other inflammatory conditions.

Clinical performance data supports the kit‘s diagnostic value. A 2025 study published in *Scientific Reports* evaluating HBP for identifying bacteremia in sepsis patients found a sensitivity of 88.64% and a specificity of 68.06% at a cutoff of 95.69 ng/mL. The negative predictive value reached 89.71%, suggesting the test is particularly useful for ruling out bloodstream infections. In the study, bacteremia patients had mean HBP levels of 204.13 ng/mL compared to 81.43 ng/mL in controls.

The Chinese Guidelines for the Management of Severe Sepsis and Septic Shock have already recognized HBP as an early diagnostic indicator. Research indicates HBP levels track with disease severity—rising progressively from uncomplicated sepsis to septic shock—and decline quickly when antibiotics are effective, making it useful for monitoring treatment response.

The assay requires only a small plasma or whole blood sample and delivers quantitative results in approximately 15 minutes, fitting the point-of-care testing model needed in emergency departments and intensive care units. The kit operates with a compatible fluorescence immunoassay analyzer and includes an IC card for calibration.

Physicians should interpret results alongside clinical findings and other laboratory tests, as HBP elevation can also occur in non-infectious inflammatory states. Nonetheless, its rapid kinetics and bacterial specificity position HBP as a valuable addition to the diagnostic toolkit for sepsis, where early recognition remains the single most important determinant of survival.