The company said now it expects to earn $2.88 to $2.91 per share on a pre-split basis, or $1.44 to $1.46 per share after the split, on revenue of $910 million to $915 million this year.

Excluding acquisition-related and other costs, earnings are expected to be $3.13 to $3.16 per share before the split, or $1.56 to $1.58 per share afterward.

In July, Idexx issued 2007 guidance, excluding writedowns, to $3.06 to $3.11 per share.

For 2008, the company forecast earnings of $1.82 to $1.87 per share on a post-split basis, with revenue of $1.03 billion to $1.05 billion.

Shareholders of record at the close of business Nov. 5 are entitled to the stock split, and will receive their additional shares Nov. 26. The company expects to begin trading its halved stock the following day. About 61 million shares will be outstanding after the split, the company said.

Idexx shares rose $6.36, or 5.6 percent, to $120.61.