Chase shows up at Hadley's place with the portable ultrasound. Hadley grabs it and tries to close the door in his face, but he puts a hand out to stop it, noting that her socks are dry. So she probably isn't dealing with a leak in her bathroom after all. Good detective work, Chase, although I have a feeling that he never believed her story in the first place due to it being pretty ridiculous. He says if she needs the ultrasound for something medical, then he can help. "I am a doctor," he says. Thank you for the exposition, Chase, but I think we all knew that already. Hadley decides to let Chase in, and he sees Darrien on the couch. Hadley explains that Darrien is her friend and that she met her in prison, which is where she was last year, by the way. Surely Chase is now regretting insisting on helping out.
House manages to give himself a PET scan without anyone in PPTH knowing. The results are bad news for him: just like the rats, he has a bunch of tumors in his leg. That sucks for him, but I don't really feel sorry for the guy. He should have known better than to inject himself with something that wasn't even finished being tested on lab rats. Also, this makes him the second character on this show to get tumors from an experimental medicine: remember Hadley and her Huntington's trial brain tumor? I guess the writers were hoping we would forget.
Hadley ultrasounds Darrien while Chase paces her apartment, shocked to have just heard the details on how Hadley ended up in jail. He thinks she should talk to a professional about her issues, but she'd rather concentrate on Darrien and the aortic arch aneurysm she believes is cutting off the blood supply to Darrien's left arm. "Help me or leave," Hadley barks. Chase decides to help, and makes a move towards Darrien. Hadley tells him to put gloves on first, since Darrien has hepatitis C. I'm sorry, but shouldn't Chase be putting gloves on, like, no matter what for this kind of thing? Shouldn't doctors always approach patients with gloves on? For both the doctor's and the patient's sakes? These people are so bad at being doctors.