NEW YORK ( TheStreet) -- Mednax (NYSE: MD) is trading at unusually high volume Wednesday with 1.6 million shares changing hands. It is currently at 4.4 times its average daily volume and trading up $3.57 (+5.5%) at $68.75 as of 11:45 a.m. ET. Mednax has a market cap of $3.22 billion and is part of the health care sector and health services industry. Shares are down 9.2% year to date as of the close of trading on Tuesday. MEDNAX, Inc., together with its subsidiaries, provides neonatal, maternal-fetal, other pediatric subspecialties, and anesthesia physician services in the United States and Puerto Rico. The company has a P/E ratio of 14.2, below the average health services industry P/E ratio of 14.5 and below the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Mednax as a buy. The company's strengths can be seen in multiple areas, such as its revenue growth, growth in earnings per share, increase in net income, largely solid financial position with reasonable debt levels by most measures and good cash flow from operations. We feel these strengths outweigh the fact that the company has had somewhat disappointing return on equity. You can view the full Mednax Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center.