Dag Helge Strand

13C labelled internal standards—A solution to minimize ion suppression effects in liquid chromatography–tandem mass spectrometry analyses of drugs in biological samples?

Thomas Berg, Dag Helge Strand · Journal of Chromatography A · 2011 · 156 citations

Natural Sciences, Chemistry, Pharmaceutical Analysis +15

Determination of opiates and cocaine in urine by high pH mobile phase reversed phase UPLC–MS/MS

Thomas Berg, Elsa Lundanes, Asbjørg S. Christophersen et al. · Journal of Chromatography B · 2008 · 129 citations

Pharmacy, Pharmacology, Toxicology +12

Determination of gamma-hydroxybutyrate (GHB), beta-hydroxybutyrate (BHB), pregabalin, 1,4-butane-diol (1,4BD) and gamma-butyrolactone (GBL) in whole blood and urine samples by UPLC–MSMS

Sandra Rinne Dahl, K. M. Olsen, Dag Helge Strand · Journal of Chromatography B · 2011 · 90 citations

Pharmacy, Biochemistry, Nutritional Sciences +10

Determination of 21 drugs in oral fluid using fully automated supported liquid extraction and UHPLC‐MS/MS

Anja Valen, Åse Marit Leere Øiestad, Dag Helge Strand et al. · Drug Testing and Analysis · 2016 · 58 citations

Pharmacy, Pharmaceutical Analysis, Pharmacology +17

Determination of 12 commonly found compounds in DUID cases in whole blood using fully automated supported liquid extraction and UHPLC-MS/MS

Lena Kristoffersen, Marit Langødegård, Kristin Irene Gaare et al. · Journal of Chromatography B · 2018 · 45 citations

Pharmacy, Chemistry, Pharmaceutical Analysis +16