Evaluation of the Hitachi 717 analyser

Clinical laboratories rely on accurate and reliable analyzers to ensure diagnostic precision. Prior research has shown that photometric accuracy and precision are critical for reliable biochemical assays. However, no prior work had resolved how specific wavelengths and sample volumes affect performance in real-world settings. This gap motivated a detailed evaluation of the Hitachi 717 analyzer. The Comisión de Instrumentación de la Sociedad Española de Química Clinica and the European Committee for Clinical Laboratory Standards provide frameworks for such assessments. These guidelines emphasize photometric accuracy, linearity, and imprecision metrics. Yet, few studies have combined these standards with routine operational data. This paper's contribution is a dual-phase evaluation focusing on both analytical unit performance and real-world use. The study distinguishes between laboratory-controlled conditions and typical clinical workflows. By addressing these aspects, the research aims to clarify the device's suitability for clinical use.

The study aimed to assess the Hitachi 717 analyzer's performance under both controlled and routine conditions. This evaluation was guided by established clinical laboratory standards. The researchers sought to measure photometric accuracy, imprecision, and linearity across specific wavelengths. They also examined the pipette delivery system and temperature control. Routine testing focused on seven biochemical determinations. The goal was to determine if the analyzer meets clinical requirements for precision and accuracy. The study's motivation stems from the need for reliable diagnostic tools in clinical settings. By evaluating both technical and operational aspects, the research provides a comprehensive performance profile.

The evaluation followed a two-step process. First, the analytical units were tested for photometric accuracy at 340 and 405 nm. Second, routine operations were assessed using seven biochemical assays. Photometric inaccuracy was measured at these wavelengths. Linearity was evaluated by analyzing absorbance dispersion for NADH at 340 nm. The pipette delivery system was tested at 3 microliters. Reagent pipette performance was also measured. Temperature control was assessed for consistency. Routine testing included glucose, creatinine, iron, total protein, AST, ALP, and calcium. Imprecision was calculated as coefficient of variation (CV) for within-run and between-run measurements.

The photometric inaccuracy was acceptable at 340 and 405 nm. Imprecision at 340 nm ranged from 0.12 to 0.95%. At 405 nm, it ranged from 0.30 to 0.73%. Linearity showed some dispersion at low absorbance for NADH at 340 nm. Drift was negligible. The sample pipette imprecision increased at 3 microliters. Reagent pipette performance was acceptable. Temperature control was good. Routine testing showed within-run CV from 0.6% for AST to 6.9% for iron. Between-run CV ranged from 2.4% for glucose to 9.7% for iron. Carry-over contamination was observed in some cases. Relative inaccuracy remained good across all assays.

The Hitachi 717 analyzer demonstrated acceptable photometric accuracy at 340 and 405 nm. Imprecision values were within acceptable ranges for most wavelengths. Linearity dispersion at low absorbance for NADH suggests potential limitations. The pipette delivery system showed increased imprecision at 3 microliters. Reagent pipette performance and temperature control met expectations. Routine testing revealed within-run and between-run imprecision that aligns with clinical standards. Carry-over contamination was noted but did not compromise overall accuracy. Relative inaccuracy remained good for all tested constituents. These findings suggest the device is suitable for clinical use within the tested parameters.