An CT scan taken last night indicated McIvor - who has three children - had a small brain bleed, but results of an MRI taken earlier today showed it was actually spinal fluid.
"Obviously being punched had just released that around the front of my brain, and the CT scan had thought it was blood and the MRI this morning showed it wasn't."
McIvor, who was back home this evening after being discharged, welcomed the news.
"It means I don't have to be on any hard drugs, I can just be on Panadol and then I go back for a CT scan in six weeks. The neuro surgeons are extremely happy, as am I."
Earlier today, McIvor said getting fit had helped him stay positive while undergoing tests.
"You get scared when someone is going to have to potentially dig into your melon, but boxing training, believe it or not has kept me healthy and fit - and I think that's helped me."
Fight for Life organiser Dean Lonergan said McIvor seemed upbeat about his situation.
"I have no idea whether the fact that he had a sore head or a headache and the fact that he fought in Fight for Life ... whether there's any correlation whatsoever and I don't know if anyone can tell me either way if that's the case or not."
Just had MRI and waiting on results, but early indications are , should be in own bed tonight and getting ready for Xmas .#allgood #thx
Great news . Discharged with news that it was spinal fluid, not blood and the stunning Neuro team here at Auckland hospital say great result
