Can you describe the test paper? This is useful for judgment.

I think it's testing hepatitis B surface antigen.

Is there a red line?

Although it is not 100% sure, according to my experience, it is to test hepatitis B surface antigen and so on. I don't know which two items are tested, but there must be one that is hepatitis B surface antigen.

This item must be checked in the physical examination of freshmen and is an important item in the physical examination of admission. There are many methods to determine HBsAg, but the gold standard method is the fastest and more suitable for the general survey of healthy people.