Early diagnosis of slipped capital femoral epiphysis (SCFE) is essential in order to reduce slip severity and subsequent risk of sequelae. The aims of this study were to evaluate patients’ and doctors’ delay in SCFE diagnosis and to identify possible factors leading to delay. We performed a retrospective review of medical charts and a personal interview with 54 consecutive patients admitted with a diagnosis of stable SCFE at three hospitals in Sweden between 2001 and 2009. Data on symptom duration, symptomatology, medical visits and type of medical contacts were retrieved. Slip angle (Southwick head-shaft angle) was measured. Median total delay from onset of symptoms to surgery was 26 weeks (range 1-109). Patients’ delay was significantly longer than doctors’ delay: 10 weeks (range 1-57) vs. 4 weeks (range 0-57) (P=0.002). Boys had significantly longer patients’ delay than girls (13 vs. 6 weeks, P=0.021) but not doctors’ delay. Children with dominance of knee pain had significantly longer doctors’ delay (14 vs. 4 weeks, P=0.002) but not patients’ delay. As expected, the total delay duration correlated with slip severity (R=0.59, P<0.001). Results demonstrate considerable delay in diagnosis of SCFE in Sweden, although the major cause is patients’ delay. Boys and children with dominance of knee pain are more likely to be diagnosed late. Efforts to increase the awareness of SCFE directed to both the general society and healthcare providers are necessary to improve future outcomes. Level III. Retrospective comparative study.