CRP and fungal infectious disease: However, low procalcitonin (<0.5 ng/mL) combined with elevated CRP (100–300 mg/L) has been shown to serve as a potential biomarker for invasive fungal infections in immunocompromised patients with haematological malignancies, similar to our cohort, offering optimal specificity, sensitivity, and positive and negative predictive values (81%, 85%, 73%, and 89%, respectively) [34].