The best healthcare investments are companies whose underlying business models are, well, healthy. If you focus on the long term, it's a lot easier to do well in the market, too. Seek out healthcare stocks that are steadily growing revenue and earnings per share (EPS).

Humana (NYSE: HUM), Vertex Pharmaceuticals (NASDAQ: VRTX), and Idexx Laboratories (NASDAQ: IDXX) are three such companies -- and their shares are all up by 20% or more so far this year. More importantly, the reason the stocks are up is that the businesses are performing well.

All three recently released second-quarter results showing both revenue growth and EPS growth. Let's review.

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Source Fool.com