diagnostical

例句：

1. 1.The doctor used a syringe to perform a diagnostic test on the patient.
   医生使用注射器对病人进行了诊断测试。
2. 2.The diagnostic tool is designed to help doctors make accurate diagnoses.
   该诊断工具旨在帮助医生做出准确的诊断。
3. 3. Diagnosis is often based on symptoms and medical history, rather than just relying on lab tests.
   诊断通常基于症状和医疗史，而不是仅仅依赖实验室测试。