LOS ANGELES -- Quest Diagnostics Inc. said Monday that it is repurchasing 15.4 million shares and is raising its Fiscal 2011 forecast. After the close, Quest said it is repurchasing shares from GlaxoSmithKline plc , thus cashing out the pharmaceutical giant's stake in the company. Quest also said it is raising its full-year earnings estimate to a range of $4.25 to $4.45 a share, up from its previous range of $4.10 to $4.30 a share. Analysts polled by FactSet Research had expected the company to earn $4.29 a share for the year. Quest shares ended trading Monday down marginally to $56.95.

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