The purpose of screening is early diagnosis and treatment.
Screening tests are usually administered to people without
current symptoms, but who may be at high risk for certain
diseases or conditions. In the case of chickenpox, screening can
be done to see whether you’ve acquired an immunity to the
disease. Blood tests—A blood sample is taken and sent to a lab.
Levels of antibodies are measured in the blood to see if you
have developed immunity to chickenpox from an unrecognized
previous infection (or a forgotten immunization). People who
have had chickenpox usually develop immunity to it. Since 1995,
a chickenpox vaccine has been available. For this reason, the
National Immunization Program recommends that if you are unsure
if you’ve ever had chickenpox or been vaccinated, you should
talk to your doctor about having a blood test to determine
whether or not you have immunity. If the tests are negative, you
are not immune. In most cases, you should then receive the
chickenpox vaccine to protect you from getting