Abstract
Background: The correct diagnosis of sexually transmitted infections (STIs) is the first step in the monitoring and management of these diseases. Objectives: This study was conducted to investigate the clinical and laboratory positive predictive value (PPV) of STI symptom management in Iran. Methods: This cross-sectional study was conducted on 5986 individuals (aged 18 to 50 years) from the general population of Marovdasht (Iran) in several stages: (1) self-reported symptoms of sexually transmitted diseases, (2) evaluation by a doctor, and (3) laboratory examination. Results: Among the population sample, 686 (17.68%) individuals reported at least one of the predefined symptoms. The clinical-based PPV of syndromes in men and women were 67.74 (62.34 - 73.14) and 85.36 (82.76 - 87.96), respectively. In men and women, the highest PPV was observed for abnormal discharge from the anus 32.35 (25.35 - 39.35) and abnormal secretions from the cervix 59.39 (56.39 - 62.39), respectively. The laboratory-based PPV for men and women was 0 and 5.04 (3.04 - 7.4), respectively. Conclusions: The clinical and laboratory-based PPV of STI symptoms in the general population is extremely low. Accordingly, a syndromic-based screening or monitoring approach for STIs is not a reliable tool for screening or monitoring in the Iranian general population. We suggest focusing on special (core) groups for monitoring STIs using laboratory-based methods.
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