An ASO test was performed on the serum from a 10-year-old female patient with the following results: no hemolysis in the 1:10, 1:20, 1:40, and 1:80 tubes; and hemolysis in the 1:160, 1:320, and 1:640 tubes. What conclusion can you draw from these results?
A) The titer is 1:640, and the patient may have glomerulonephritis.
B) The titer is 1:160, and the patient may have rheumatic fever.
C) The titer is 1:80, and the patient is normal.
D) The test is invalid and must be repeated.
Ans: C) The titer is 1:80, and the patient is normal.
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