shares of laboratory corp of america holdings lh shed 239 to 22296 wednesday on what proved to be an allaround positive trading session for the stock market with the sp 500 index spx rising 034 to 394601 and the dow jones industrial average djia rising 010 to 3113509 this was the stocks second consecutive day of losses laboratory corp of america holdings closed 9421 short of its 52week high 31717 which the company reached on december 31st the stock underperformed when compared to some of its competitors wednesday as idexx laboratories inc idxx rose 001 to 35047 quest diagnostics inc dgx fell 153 to 12399 and qiagen nv qgen fell 073 to 4497 trading volume 889349 eclipsed its 50day average volume of 564640 editors note this story was autogenerated by automated insights an automation technology provider using data from dow jones and factset see our market data terms of use