Our authors looked at the effect of single kidney glomerular filtration rate and/or donor/recipient body surface area ration affected graft function post-transplant.
Give the whole study a read here: http://informahealthcare.com/doi/abs/10.3109/0886022X.2015.1007805
But in short, they found that SKGFR <40 is a problem, as is D/R BSA <0.8. The larger the donor/recipient body surface area ratio the better in terms of post-transplant graft function, apparently.
ETA: In layperson’s terms, this means that a kidney from a smaller living donor doesn’t do well in a larger recipient.
Jinfeng, L., Jia, L., Tao, G., Wenjun, S., Xinlu, P., Yonghua, F., & Guiwen, F. (2015). Donor kidney glomerular filtration rate and donor/recipient body surface area ratio influence graft function in living related kidney transplantation Renal Failure, 1-6 DOI: 10.3109/0886022X.2015.1007805