Exhibit 23.2
Consent of Independent Registered Public Accounting Firm
We consent to the incorporation by reference in the Registration Statement (Form S-8 filed on June
19, 2009) pertaining to the 2005 Stock Incentive Plan of NxStage Medical, Inc. of our reports dated
March 16, 2009, with respect to the consolidated financial statements of NxStage Medical, Inc.
included in its Annual Report (Form 10-K) for the year ended December 31, 2008, and the
effectiveness of internal control over financial reporting of NxStage Medical, Inc. filed with the
Securities and Exchange Commission.
Boston, MA
June 19, 2009