Establishment of tumor marker reference intervals for different age and gender groups in the healthy population of South China.

To establish age- and sex-specific reference intervals (RIs) for serum tumor markers (AFP, CEA, CA125, CA199, CA153, HE4, CA724, CYFRA21-1, PSA, and NSE) among a cohort of healthy individuals in South China, a retrospective analysis was conducted on 51,353 samples collected from 2015 to 2020, during health assessments at Guangdong Provincial People's Hospital. The influence of age and gender on serum tumor markers was investigated. New RIs were determined using non-parametric rank-based methods per CLSI EP28-A3C guidelines. Significant differences were detected across age groups for AFP, CEA, CA125, CA199, HE4, CYFRA21-1, PSA, and NSE (p < 0.05). The upper reference limits (URLs) for CA153 and HE4 are significantly lower compared to our current laboratory standards. The URL for CA125 exceeds these limits in individuals under 50 but decreases in those aged 50 and above. For CA199, CEA, and PSA, the URLs are below current standards in individuals younger than 60 but exceed them in those aged 60 and older. Noteworthy elevations were observed in CA724, CYFRA21-1, and NSE levels. Our study establishes age- and sex-specific RIs for ten serum tumor markers among healthy individuals from South China, providing a fundamental resource for the prevention, early detection, and management of tumor-related disorders.