The school requires to fill in the "PPD test notice", agree or disagree. I don't know what "tuberculin" is. Should I agree?

Of course, you can agree. This is an essential physical examination for the entrance examination to see if you have tuberculosis infection. There is no harm to the body. If you don't do it, you will be identified as a tuberculosis patient and refuse to enter school.

The 48-hour ppd skin test can basically determine the results. The diameter of the mass is negative within 5 mm; Positive within 5-20mm; More than 20 mm strong positive.

Introduction to PPD:

Tuberculin test, also known as PPD test, usually takes 48-72 hours to observe. Erythema was observed 72 hours after intradermal injection of tuberculin reagent. If the diameter of erythema

If erythema >: 2cm, or blisters, ulcers, induration, etc. It suggests that PPD test is strongly positive, suggesting that tuberculosis infection may occur. However, PPD test is not a definite test to diagnose tuberculosis, and further culture of tuberculin is needed to make a definite diagnosis.

Refer to the above content: Baidu Encyclopedia-Tuberculin