Many diagnostic firms saw gains in their stock prices last month as Invitae and NantHealth also saw healthy increases.
The 360Dx Index was up 12 percent last month as shares of Accelerate Diagnostics, Veracyte, and Exact Sciences each improved more than 40 percent month over month.
With its stock price languishing below $1, NantHealth has 180 days to come into compliance with Nasdaq listing rules.
UBS initiated coverage of Quest with a Neutral raing and a $90 price target on its shares. It gave LabCorp a Buy rating and a $169 price target.
The improvement in the 360Dx Index was modest compared to 2017, but it still outpaced the broader markets, which fell dramatically in the last month of the year.
Veracyte was the only company in the 360Dx Index whose stock price rose last month while NantHealth, NeoGenomics, and Accelerate Diagnostics saw sharp declines.
The expected net proceed are now $5.4 million, down from an earlier anticipated $9.1 million. Investors reacted negatively to the news today.
November's modest gain followed a tough October, when the index down almost 9 percent. Meridian Bio paced the gainers, and NantHealth was the steepest decliner.
For 2018, Quest lowered its revenues expectation to $7.57 billion, its EPS to greater than $5.34, and its adjusted EPS to greater than $6.30.
Just five of the 28 firms in the 360Dx Index saw their share prices rise last month. Veracyte led the gainers, while Accelerate Dx had the sharpest decline.