Scenes being played upstairs, in the next room, or on the fire escape outside are simultaneously projected for us as we sit in an ad hoc screening room, helplessly, happily lost in the crosscurrents of images and feeling she sets in motion.
Any ad hoc screening process for a particular purpose requires validation for reliable analysis and interpretation.
When designing the present study, a key question was whether information obtained through a research scan should be used for ad hoc screening of research participants.
A recent British Medical Association report highlighted, however, that ad hoc screening can put people at risk because of a lack of evidence underpinning tests and insufficient quality assurance and accompanying information [ 25].
Instead of replacing all the existing methods to control the false discovery, we propose to add the global tests to the current MDR framework as an ad-hoc screening process to prevent false discoveries.
High risk individuals who attended the local outpatient clinic for tropical medicine, were offered ad hoc (preconception) screening which would inform them of their carrier status.
However, the alternative at the moment is that 26% of patients get a preceded by normal test and thus establish their own ad hoc PSA screening programme.
The Ely screening programme may not have contributed to a reduction in clinical measures and cardiovascular disease morbidity because of ongoing ad hoc opportunistic screening for diabetes and other cardiovascular risk factors at the primary care level in the UK [ 28, 29].
Despite over 20 years of health promotion campaigns predominantly focusing on melanoma prevention, and ad hoc opportunistic screening by skin examination, both the rates [ 2] and the thickness of melanomas have been increasing in Maori and non-Maori New Zealanders [ 3].
To assess its impact on mortality it is important to distinguish between diagnosis of cancer in symptomatic patients, and early detection in asymptomatic individuals who may self-refer or who may be offered ad hoc or systematic screening.
