In 15-16 year olds from Oslo, Norway, we investigated the occurrence of self-reported dyslexia and reading/writing difficulties (RWD), and we measured dyslexic symptoms using the "Duvan" dyslexia screening test. The prevalence of self-reported dyslexia was 8.2%, while 10.4% reported severe or moderate RWD. The group of self-reported dyslexics obtained lower mean-values on "Duvan" than the non-dyslexic group (125.7 [SD = 20.2] versus 153.2 [SD = 23.4]), but not on the test of general ability. The questionnaire items on dyslexia and RWD, as well as gender, ethnicity and general ability, significantly predicted "Duvan" scores (explained variance, R[superscript 2] = 0.25). More research is needed to explore the precision of "Duvan" as a screening tool for dyslexic symptoms among Norwegian adolescents. (Contains 5 tables.)