Their FF-PTX3 levels tended to be lower than the level in the IVF group (median 6.55; range 6.45–7.65 μg/L, P = 0.05), although their plasma PTX3 levels up to OPU were similar to the final IVF group, and after OPU similar to the other OHSS patients (data not shown). Here, PTX3 is linked to ovarian hyperstimulation syndrome.