NEW YORK ( TheStreet) -- The medical sector has become one of the six pure momentum sectors in the market today. At www.ValuEngine.com we show the medical sector 15.7% overvalued vs. 5.5% overvalued when I wrote Book Profits on Health Care Stocks on Aug. 8. My ETF benchmark for this is the Health Care Select Sector SPDR Fund ( XLV). Below, I profile this ETF and give updates on the top 10 holdings of this ETF.Medical stocks are more volatile than most of the other momentum sectors as each stock has a story with regard to their drugs, medical services, devices or presence in biotechnology. When you rely on my three-pronged approach of fundamental screening, technical screening with chart patterns and applying value levels at which to buy and risky levels at which to sell, you are using guidelines to judge what stock specific news is factored-in, or not factored in, during the day to day volatility in the stock market.