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Diagnosen urinvägsinfektion är osäker när den baseras på kastade urinprover. Urinstickan med leukocyt och nitrittestet är då till viss hjälp. Förklara i termer av sensitivitet och specificitet vad leukocyter positiv/negativ resp. nitrittest positiv/negativ betyder för säkerheten i diagnostiken.
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