What is the test for adverse credibility in a medical malpractice case?

F.3d 66, 73 (2d Cir.2004) (internal citations and quotation marks omitted). Our review of an adverse credibility determination is "exceedingly narrow," Melgar de Torres v. Reno, 191 F.3d 307, 313 (2d Cir.1999), and ensures only that it is "based upon neither a misstatement of the facts in the record nor bald speculation or caprice." Zhang, 386 F.3d at 74.