Quest Diagnostics Inc.’s (DGX) robust Advanced Diagnostics offering is poised to drive its growth in the upcoming quarters. Strength in the company’s core business is highly encouraging. Additionally, a strong focus on cost discipline bodes well for the stock. However, mounting debt and lower COVID-19 revenues are concerns for Quest Diagnostics’ operations.In the past year, this Zacks Rank #2 (Buy) stock has increased 20.8% compared with the industry’s 29.4% growth and 33.7% growth of the S&P 500 composite. ...