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We investigated factors such as time span between transplantation and having offspring, the dosage of immunosuppressive agents during fertilisation and the effects of fertilisation on recipient's renal allograft function in 212 male recipients registered at eight Chinese organ transplantation centres. Our results are as follows: the 212 male renal allograft recipients conceived with their wives between 15 and 204 months after transplantation. The wives who became pregnant at 15-24 months after the renal transplantation gave birth to a total of 20 babies with an average weight of 3115 ± 517 g, of which 3 (15.0%) were premature. The wives who became pregnant at 25-204 months after the renal transplantation gave birth to a total of 196 babies with an average weight of 3384 ± 438 g, of which 6 (3.1%) were premature. All recipients had normal renal function during the fertile period. In conclusion, the fertility capacity of male renal allograft recipients was associated with the time after transplantation and the dose of immunosuppressive agents used during fertilisation. It might be helpful to have a fertility capacity evaluation before fertilisation. There were no effects of fertility on renal allograft function. [ABSTRACT FROM AUTHOR]