① Laboratory examination can confirm:
Leukemia (bone marrow examination), endocrine gland diseases (endocrine function examination).
② Laboratory examination combined with clinical symptoms can assist the diagnosis of diseases:
Liver disease and kidney disease (liver and kidney function test).
③ Differential diagnosis can be made through laboratory examination:
If the change of white blood cells in peripheral blood is detected in patients with fever, and the ratio of white blood cells to neutrophils is increased, it may be caused by purulent infection, while the increase of lymphocytes is considered to be caused by virus infection.
2. Common evaluation indicators
① Sensitivity: refers to the ability of a test item to identify and confirm a disease (true positive rate).
② Specificity: refers to the ability of an examination item to confirm that there is no certain disease.
(Real negative interest rate)
③ Correct rate: refers to the percentage of correct diagnosis (true yang+true yin) among all test results of a test item in actual use.
④ROC curve (clinical application performance analysis and evaluation chart)
Comparison of common diagnostic values in more than two diagnostic tests