Diagnosing invasive candidiasis (a serious fungal infection in ICU patients) is challenging because current blood culture tests are slow and insensitive. This paper presents a practical five-step diagnostic guide for UK and Ireland hospitals that combines risk assessment, biomarker tests, and rapid identification methods to diagnose the infection faster and more accurately. Using this strategy helps doctors avoid unnecessary antifungal drugs while ensuring seriously ill patients receive appropriate treatment quickly, ultimately improving survival rates.