3. Purpose of Screening
• To detect early disease or risk factor
for disease in large number of
apparently healthy individuals.
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4. • Active search for disease among apparently
healthy people is a fundamental aspect of
prevention.
• This is done in screening , which has been
defined as “ search for unrecognised disease or
defect by means of rapidly applied tests ,
examinations or other procedures in apparently
healthy individuals”.
CONCEPT OF SCREENING
6. • Screening differs from periodic health
examination in the following aspects :
Capable of wide application
Relatively inexpensive
Requires less physician - time
7. • Basic purpose of screening is to sort
out , large group of apparently healthy
persons those likely to have the
disease or at increased risk of disease
under study.
• They also bring ‘apparently abnormal’
individuals under medical supervision
and treatment.
AIMS AND OBJECTIVES
8. • To detect outbreak or disease or
production losses and causes.
• To identify the undiagnosed cases of
disease.
• To monitor health trends in a target
population.
OTHER PURPOSES
9. • To monitor exposed individuals for
symptoms.
• To monitor treated individuals for
complications.
• To generate hypothesis for further
evaluation.
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10. • Early diagnosis and subsequent
treatment favourably alters the
natural history of the disease in a
significant proportion of those who
are identified as positive.
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11.
12. • Diagnosis of disease at
individual level .
• Positive results in screening
needs more confirmatory tests
/ diagnostic tests .
IT DOES NOT INTEND FOR.....