Quest Diagnostics Incorporated DGX posted better-than-expected first-quarter earnings on Tuesday.Quest Diagnostics reported quarterly earnings of $2.21 per share which beat the analyst consensus estimate of$2.15 per share. The company reported quarterly sales of $2.65 billion which beat the analyst consensus estimate of$2.63 billion."In the first quarter, we delivered strong revenue growth of approximately 12%, including nearly 2.5% in organic growth, as demand rebounded in March following weather impacts ...