Editor's Note: Any reference to TheStreet Ratings and its underlying recommendation does not reflect the opinion of TheStreet, Inc. or any of its contributors including Jim Cramer or Stephanie Link. All three major indices are trading up today with the Dow Jones Industrial Average ( ^DJI) trading up 72 points (0.4%) at 16,112 as of Thursday, Feb. 20, 2014, 11:55 AM ET. The NYSE advances/declines ratio sits at 1,810 issues advancing vs. 1,095 declining with 165 unchanged. The Health Services industry currently sits up 0.5% versus the S&P 500, which is up 0.3%. Top gainers within the industry include Icon ( ICLR), up 7.4%, Parexel International Corporation ( PRXL), up 3.3%, Varian Medical Systems ( VAR), up 2.5%, PerkinElmer ( PKI), up 2.0% and Agilent Technologies ( A), up 1.5%. TheStreet would like to highlight 3 stocks pushing the industry lower today: 3. DexCom ( DXCM) is one of the companies pushing the Health Services industry lower today. As of noon trading, DexCom is down $1.61 (-3.6%) to $42.92 on heavy volume. Thus far, 875,413 shares of DexCom exchanged hands as compared to its average daily volume of 652,000 shares. The stock has ranged in price between $42.04-$44.34 after having opened the day at $44.34 as compared to the previous trading day's close of $44.53. DexCom, Inc., a medical device company, focuses on the design, development, and commercialization of continuous glucose monitoring systems. DexCom has a market cap of $3.2 billion and is part of the health care sector. Shares are up 25.8% year-to-date as of the close of trading on Wednesday. Currently there are 8 analysts that rate DexCom a buy, no analysts rate it a sell, and 5 rate it a hold. TheStreet Ratings rates DexCom as a sell. The area that we feel has been the company's primary weakness has been its disappointing return on equity. Get the full DexCom Ratings Report now. STOCKS TO BUY: TheStreet Quant Ratings has identified a handful of stocks that can potentially TRIPLE in the next 12 months. Learn more.