During trading today, the Health Care sector (XLV) showed little change while the S&P 500 fell 0.9%.

While being down today, the ETF, as a proxy for sector performance, tracked closer to the overall market today than over the past month. Entering today's trading, XLV was up 2.9% over the last thirty trading days while the S&P 500 was down 0.8%.

Rosetta Genomics (ROSG) was one of the sector's big losers, as its price dropped 8.1% (-92 cents) to close at $10.39. 359,175 shares of the stock moved. The stock traded in a range of $10.12 to $11.42.

Chembio Diagnostics (CEMI) was a major gainer in the sector, rising 7.1% (+30 cents) to close at $4.55 with 16,301 shares moving. The stock traded in a range of $4.30 to $4.55.

GlaxoSmithKline (GSK) declined 3.4% to close at $44.99, moving below its 50-day moving average of $45.29 and 200-day moving average of $45.14. LHC Group (LHCG) rose 1.1% to close at $17.15, crossing its 50-day moving average of $17.05.

PAREXEL International Corporation (ISRG) fell 2.7% to close at $27.98, moving closer to its 50-day moving average of $27.35. Also, the stock moved closer to its 200-day moving average of $518.20. MELA (MELA) rose 5.7% to close at $3.55, getting closer to its 200-day moving average or $3.86.

Obagi Medical Products (OMPI) hit a new 52-week high today, reaching $16.75 to top the previous high of $16.35.