Key Takeaways DGX stock jumped 27.3% over 12 months, far exceeding the industry and the benchmark's performance. Quest Diagnostics' strength in Advanced Diagnostics supports growth across high-demand medical categories. New health plan deals and lab partnerships are expanding DGX's reach and boosting volume and revenue.Quest Diagnostics (DGX) has shown impressive momentum in the past year, with its shares rallying 27.3%. The performance outpaces the industry’s 5.9% rise and the S&P 500 composite’s 12.3% g ...