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A blood test for the presence of alpha-1 antitrypsin is said to have a sensitivity of...

A blood test for the presence of alpha-1 antitrypsin is said to have a sensitivity of 0.9 and a specificity of 0.85. What do these terms mean for this test?
Math   Statistics-And-Probability   
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Sensitivity of 0.9 means that 90% of the individuals having a positive test will have the disease. It is the measure used to report how effective a test is in identifying individuals with a disease. The higher the sensitivity is the better.

Specificity of 0.85 means that 85% of the individuals having a negative test are without the disease. It is the measure used to report how effective a test is in identifying individuals without the disease. The higher the specificity is the better

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