OBJECTIVES: Adaptation and validation of measures of short-term and long-term consequences of false positive screening-mammography. METHODS: After translation (including quality control) of the PCQ it was presented in six focus groups (5-7 women) and in 15 telephone interviews. All interviewees had previously experienced false positive screening-mammography. Validation-I: Six hundred women completed the short-term questionnaire together with the Danish version of the Nottingham Health Profile (NHP). One-third had had abnormal and two-thirds had had normal screening-mammography. Validation-II: One hundred twenty-seventy women who had had false positive screening mammography up to 6 months ago, and 197 women with normal mammography completed the long-term questionnaire. Data were analysed using traditional psychometric theories and Item Response Theories. RESULTS: None of the PCQ items were found irrelevant. The interviewees, however, found that not all consequences of false positive screening-mammography were covered by the PCQ. Twenty-eight items were generated (including splitting of double-barrelled item) and it was decided to divide the questionnaire into 2, 1 measuring short-term and another long-term consequences. Both questionnaires were found to be reliable with Cronbach’s Alpha 0.95 and 0.90. Validation-I: 4 strongly correlated dimensions (24 items in total) were found to be in order and additive, 4 single items were kept because of high face validity and five ‘bad’ items (including one of the original PCQ items) were deleted. Results on Know Group Validity and Concurrent Validity (i.e. correlation with the 6 NHP sections) confirming the a priori hypothesis will be presented at the conference. Validation-II: No bad items were identified. Three strongly correlated dimensions (13 items in total) were found to be in order and additive. CONCLUSIONS: Two reliable and valid instruments, one on short-term and one on long-term psychosocial consequence of false positive screening-mammography have been developed and are currently under adaptation into Norwegian and English.