The Brad Jones Racing driver was at the centre of spectacular fire at the tail end of last Sunday's race, his car igniting fuel spilled by a faulty refuelling rig.
That left both the BJR pit bay and the back of Percat's Holden on fire, the latter extinguished by quick-thinking crew members from Triple Eight and DJR Team Penske at the exit of pitlane.
Having ingested powder from both the extinguishers used to fight the fight, and the on-board fire protection system in the car, Percat opted to visit doctors this week for precautionary checks.
According to the 2011 Bathurst winner, the need to stay on top of any potential health issue stems back to a blood infection he contracted after burning his foot while driving for LD Motorsport back in 2015.
"I had my lungs and stuff checked out the other day just to make sure, because obviously I got sprayed with the extinguishers because my radio cord got caught in the seat when I was getting out," Percat told The Loud Pedal podcast.
"That's just something I did because a few years ago I ended up in hospital after I had that blood infection from the LDM car overheating inside, so my immune system can be a bit weak.
"I just went in, got some blood tests done, had the lungs checked out, just so that I don't have any dramas. Last thing I need to go is get to QR and feel like death and end up in hospital again."
Reflecting on the fire itself, Percat says he's still yet to find out exactly what happened, with both BJR, Supercars and the Confederation of Australian Motor Sport continuing to investigate the incident.
"I'm not 100 per cent sure, I've only seen the broadcast footage," he added.
"I noticed there was fuel everywhere before I got there. The fuel hose has either split or the coupling has failed. I don't even know if they actually plugged it into my car, because there was fuel going everywhere.
"Probably, if we had out time again, you'd send the car past the pit bay and just press on. But it was all happening and by the time they realised I was there."