This study investigated how stable Pentraxin 3 (Ptx3), a protein used to detect fungal infections, remains when stored at different temperatures. Researchers found that Ptx3 stays reliable for up to 8 months in freezer storage at −20°C and even longer at −80°C, making it a dependable biomarker for diagnosing serious fungal infections. However, storing samples at room temperature (37°C) causes the protein to break down quickly, so proper cold storage is essential for accurate test results.