** Shares of laboratory operator Quest Diagnostics DGX.N were up 1.57% at $194.25 premarket

** Co forecasts 2026 revenue in the range of $11.7 billion to $11.82 billion, above analysts' estimates of $11.39 billion, according to data compiled by LSEG

** Co forecasts 2026 adj profit between $10.50 and $10.70 per share, compared to estimates of $10.43 per share

** Q4 revenue rose 7.1% to $2.81 billion, beating estimates of $2.75 billion

** Co reported Q4 adj profit/shr of $2.42, vs estimates of $2.36

** DGX stock was up 15% in 2025

(Reporting by Gnaneshwar Rajan in Bengaluru)

((Gnaneshwar.Rajan@thomsonreuters.com;))