What is a screening testing?

I am 15 and getting a screening test to determine whether i need an injection to prevent me from a disease, i want to know what do they do in a screening exactly?
Answers:
A screening theory test is done when you have a healthy, asymptomatic patient contained by whom there is a significant incidence of a disease. In other words, if a given disease occurs at your age, and there is a question paper that can check for it quickly and cheaply but without certainty as to the results.

If the trial comes up positive, then you need additional test to confirm this. If it's negative, you can be reasonably comfortable that you don't have the disease.

Mammography, for example, is a screening tryout that women use to look for breast cancer.

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