IL6 and infection: On the other hand, Hoell et al.7 demonstrated that an absolute value of > 13 pg/ml of IL-6 was a reliable indicator of persisting infection which contradicts a more recent finding of Jiang et al.25 who investigated the change in Il-6 in between stages and concluded that it was a poor marker also given that the pre-reimplantation value of Il-6 was only 3 pg/ml in patients with reinfection.