Evaluation of the effect of extended refrigerated storage of serum and plasma specimens on syphilis serological test results

ABSTRACT The effect of extended refrigerated storage of 14 serum and plasma specimens on five syphilis serological tests was evaluated for 16 weeks. Higher stability of nontreponemal and treponemal antibodies in serum was recorded compared to plasma. Described work may provide insights on refrigerated specimens’ stability and suitability for syphilis tests.