A Filter Integrity Analyzer (FIA) evaluates a filter's integrity through methods such as bubble point, diffusive flow, or pressure decay. The pressure drop across a filter against the flow rate of fluid passing through is measured, assisting in assessing filter integrity by revealing changes in pressure drop with flow rate. Meeting the bubble point condition requires pressure to surpass the minimum bubble pressure, while the forward flow condition is satisfied by an acceptable pressure drop, and the water intrusion condition is achieved when the filter effectively repels water, indicating a well-functioning filter. Equipped with specialized instrumentation like pressure transducers and flow meters, FIAs offer rapid and accurate analysis, aiding product quality and regulatory compliance in pharmaceutical manufacturing.