NEW YORK (GenomeWeb News) – Quest Diagnostics this week announced a definitive agreement to buy full-service commercial laboratory firm Solstas Lab Partners for $570 million. Quest is buying Solstas from private equity firm Welsh, Carson, Anderson, and Stowe. Based in Greensboro, NC, Solstas operates in nine states in the Southeastern US. Quest said the deal is anticipated to add about 5 percent in annualized revenues and to be "modestly" accretive to adjusted EPS in 2014. The deal is expected to be completed in the first half of the year.