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==Key Stage 4==
===Meaning===
A '''double blind trial''' is a '''[[Clinical Trial|clinical trial''' ]] where the [[doctor]] and the [[patient]] don't know if they have been given a real potential [[medicine]] or a [[placebo]].
===About Double Blind Trials===
: '''Double blind trials''' are used to prevent [[bias]] from affecting the results of a [[Clinical Trial|clinical trial]] when either the [[doctor]] or the [[patient]] expect the potential [[medicine]] to work or not.
: Many [[Alternative Medicine|alternative medicines]] appear to work until they are tested with a '''double blind trial''' showing that they are just a [[placebo]] and not a real [[medicine]].