Diagnostic Accuracy of A Diquat Quantitative Detection Kit and A Portable Mass Spectrometry System for Quantifying Diquat Concentrations in Human Blood Samples

This is an observational, non-interventional diagnostic accuracy study designed to evaluate a diquat quantitative detection kit (ambient ionization mass spectrometry method) and a portable mass spectrometry analysis system for measuring diquat concentrations in human blood samples (whole blood/plasma), using LC-MS/MS as the clinical gold standard for comparison.

Inclusion Criteria: 1. Patients with suspected or clinically diagnosed acute diquat poisoning, providing whole blood and/or plasma samples, including qualified residual specimens retained after prior clinical testing when available. 2. The participant or their legally authorized representative can fully understand the study purpose and procedures, voluntarily agrees to participate, and is willing and able to comply with the study requirements. 3. Sample collection is performed according to routine clinical standards, with no apparent ethical concerns related to sample acquisition. Exclusion Criteria: 1. Abnormal sample appearance, such as visible flocculent material or other gross abnormalities. 2. The participant is unable to provide a specimen, or the specimen does not meet testing requirements. 3. Any participant considered inappropriate for inclusion by the investigator.