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Hi all, welcome to module three.

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This week, we're going to talk about

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disease screening techniques,
which are any number

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of things that help you diagnose disease.

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Disease screening may
already be familiar to you,

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such as the use of blood tests

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for glucose levels to diagnose diabetes

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or colonoscopies for colorectal
cancer or genetic tests

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for diseases such as
Alzheimer's or cystic fibrosis.

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Screening tests are all over

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and are one of the most
effective preventive strategies,

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so it's really important in public health

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for us to have good
screening where we can.

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What you are going to
learn about in the readings

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and lecture this week are
various measures we use

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to look at the effectiveness
of our screening tests.

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If you've taken biostats already,

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some of these may already
be familiar to you.

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We'll go into a bit more depth here,

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looking at advanced screening strategies

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such as sequential and
simultaneous testing.

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These are really useful in public health

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because we're always trying
to look for a balance

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between getting good
information that we can use

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as public health experts
in order to prevent disease

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and improve the health of our communities,

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but also balancing that
with the burden of testing

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on patients as well as
the burden of anxiety

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due to the lack of effectiveness

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or accuracy in our screening tests.

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I hope you enjoy this material

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and can see that balance of work.

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If you have any questions,

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please don't hesitate to let me know.

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I'll see you next week.