diagnostic
/ˌdaɪəgˈnɔstɪk; ˌdaɪəɡ`nɑstɪk/ adj[usu attrib 通常作定语]
of diagnosis 诊断的; 判断的
diagnostic skill, training, etc 诊断的技术、 训练等
symptoms that were of little diagnostic value, ie that did not indicate the patient's disease 对诊断是何疾病无甚参考价值的症状（即该症状显示不出是何疾病）.