By Sahil PandeyJuly 30 (Reuters) - Laboratory operator Labcorp raised its annual profit forecast and posted better-than-expected second-quarter results on Thursday, ‌as steady demand for diagnostic testing and growth in ‌its drug-development services business boosted performance. • Peer Quest Diagnostics last ​week raised its full-year ‌profit forecast after demand for routine diagnostic testing helped the company beat second-quarter estimates. • The ​company lifted its annual revenue forecast ​to a range of $14.71 ​billion to $14.83 billion from its previous projection of $14.65 ‌billion to $14.80 billion. • ​Revenue at its Biopharma Laboratory Services segment rose 6.5% to $836.2 million, exceeding estimates of $797.3 million. • Overall second-quarter revenue rose ​5.8% to $3.73 billion, above ‌estimates of $3.71 billion.