Screening for condition recommended when-
Ref:Parks 23rd edition pg 136. Screening is carried out in the hope that earlier diagnosis and subsequent treatment, orably alters the natural history of the disease in a significant propoion of those who are identified as "positive". Note: We don&;t do screening when the disease has a low case fatality ratio. Diagnostic tools/tests must be made available before doing a screening test. Otherwise it will be in vain. Effective treatment should be available prior to doing a screening test. Also Refer p. 135. Table 1.
Low case fatality rate
Diagnostic tools not available
No effective treatment available
Early diagnosis can change disease course because of effective treatment
Screening