Martha tracks down Elena, who asks about her sister. Martha says Nadia is on a beta blocker that should control her heart rate. Elena says Nadia banned her from her hospital room. Really? Then why is Elena still there? She's done her time. Nadia isn't worth this. "She can be such a bitch," Elena says; "she never ever ever lets anything go." Well, that's not exactly her fault, Elena. But this time, Martha knows, it wasn't Nadia or Elena's fault. It was Martha's for starting their fight. She feels compelled to tell Elena the truth. Elena doesn't take the news well. She knows that it doesn't matter who started their fight; in the end, that fight is what Nadia will remember in perfect detail and hold over her sister's head. "You're both bitches," Elena says. She walks away, leaving Martha to try not to cry in the hallway. Chase distracts her by calling her into Nadia's room to smell her breath. It smells like ammonia, and that means either Nadia just ate a slice of ammonia pie or her kidneys are shutting down.
The Cottages are hard at work coming up with new diagnoses. House isn't, as he'd rather toss a bunch of insurance forms in front of Foreman, the new foreman of the Foreman department of insurance forms. Yes, Chase tattled on Foreman for giving up on tutoring Taub. Taub and Foreman can't believe it. "He asked!" Chase says. "You're worse than Masters," Taub says. "How is this my fault?" Martha asks, now involved. House says Foreman can look forward to doing insurance forms for the rest of his time under House's thumb if he doesn't go back to tutoring Taub and tutoring him well enough that Taub passes his second exam. Taub goes for a desperate last-ditch effort to get Foreman off his back: he accuses House of caring about him so much that he can't stand the idea of losing Taub because he failed the second exam. House calls this a noble attempt, but it won't work. Taub and Foreman can go off and study together while Chase and Martha give Nadia steroids for a possible autoimmune disorder and dialysis for her kidneys.
Wilson is preparing Sara's latest insulin injection when he finds himself feeling sneezy and generally allergy-ridden. He knows exactly who to blame for this, and goes to work to accuse House of planting something he's actually allergic to in his apartment to make him think he's allergic to Sara. House says Wilson sounds paranoid, which is a symptom of being a Crazy Cat Lady. Wilson says he knows what he's allergic to: ragweed and dandelions. He is not allergic to cats. And even if he was, it's not like he'd suddenly start sneezing after having the cat with no problems for days or even weeks. Try harder, House. He says if Wilson wants to prove that he can be sociable and meet women, even with a pet cat, then he'll join House on a boys' night out.