Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 38 1 2000 03 15 7 9 Pishva N Pishva H 2015 09 28 Thrombocytopenia has been reported as a complication of phototherapy. In this study the effect of conventional phototherapy on platelet count was studied in 101 newborns with indirect hyperbilirubinemia, out of whom 50 patients (49.5%) had decreased levels of platelets; 20 (19.8%) of the latter had a platelet count of below 100000/mm3. Decreased platelet count was maximum during the first 24 hours of phototherapy. Ultrviolet light may increase plateled turnover and injury during phototherapy by and unkown mechanism. https://acta.tums.ac.ir/index.php/acta/article/view/2153 https://acta.tums.ac.ir/index.php/acta/article/download/2153/2144