CareDx Inc. provided preliminary revenue guidance for the fourth quarter and full year ended December 31, 2017. For the quarter, the company expected revenue to be between $12.3 million and $12.5 million, an increase of 13%-15% compared with $10.9 million in the fourth quarter of 2016.  For the full year, the company expected revenue to be between $48.1 million and $48.3 million, an increase of 18%-19% compared with $40.6 million in 2016.