Adolescent idiopathic scoliosis (AIS) is the most prevalent form of paediatric spinal deformity which may result in curve progression, functional limitation, and adverse long-term outcomes if undetected. Early detection through screening may facilitate timely interventions and improved long-term outcomes. Study aimed to determine the prevalence, associated factors and comorbidities of AIS, and to evaluate the feasibility and accuracy of combined Adam’s Forward Bend Test (FBT) and scoliometer screening. A descriptive cross-sectional study was conducted among 324 students aged 11–15 years, selected using multi-stage cluster sampling from government schools in the Colombo district. Children with known congenital or secondary causes of scoliosis were excluded. Screening included an interviewer-administered questionnaire. Assessment done thorough physical examination, nutritional assessment, leg length measurement, FBT and scoliometer measurement, with a spinal inclination angle >6° considered positive. Data were analyzed using SPSS version 21. The mean age was 12.25±1.5 years; 55% were males. AIS prevalence, defined by combined positive FBT and scoliometer findings, was 4.3%. Positive scoliometer readings were observed in 4.9%, while 6.2% demonstrated positive FBT findings. AIS was significantly associated with lower body mass index (p=0.034), reduced exercise tolerance (p=0.02), and discontinuation of sports activities (p=0.04). Significant clinical indicators included shoulder elevation, scapular prominence, waist fold asymmetry , rib prominence, and increased thoracic kyphosis (p