Publications 2025

Årnes M, Edvardsen HME, Holmen LB, Kristoffersen L, Høiseth G (2025)
Post-mortem formation of GHB: A retrospective study of forensic autopsies
Forensic Sci Int, 372, 112492
DOI 10.1016/j.forsciint.2025.112492, PubMed 40398065

Publications 2023

Kristoffersen L, Vevelstad M, Hansen IA, Strømsvåg B, Strand DH (2023)
Comparative Evaluation of Carboxyhemoglobin Quantification in Postmortem Whole Blood by CO-Oximetry and Headspace Gas Chromatography with Flame Ionization Detection and Atom Absorption Spectrophotometry
J Anal Toxicol, 47 (3), 311-316
DOI 10.1093/jat/bkac099, PubMed 36495201

Strand MC, Bleka Ø, Kristoffersen L, Høiseth G (2023)
Driving under the influence of zopiclone: Elimination between two consecutive blood samples
Forensic Sci Int, 349, 111764
DOI 10.1016/j.forsciint.2023.111764, PubMed 37352736

Publications 2021

Midtlyng L, Høiseth G, Luytkis H, Kristoffersen L, Le Nygaard I, Strand MC, Arnestad M, Vevelstad M (2021)
Relationship between betahydroxybutyrate (BHB) and acetone concentrations in postmortem blood and cause of death
Forensic Sci Int, 321, 110726
DOI 10.1016/j.forsciint.2021.110726, PubMed 33631622

Oshaug K, Kronstrand R, Kugelberg FC, Kristoffersen L, Mørland J, Høiseth G (2021)
Frequency of postmortem ethanol formation in blood, urine and vitreous humor - Improving diagnostic accuracy with the use of ethylsulphate and putrefactive alcohols
Forensic Sci Int, 331, 111152
DOI 10.1016/j.forsciint.2021.111152, PubMed 34952291

Sidqey D, Liane VH, Kristoffersen L (2021)
Quantitative Determination of Ethyl Glucuronide and Ethyl Sulfate in Postmortem and Antemortem Whole Blood Using Phospholipid Removal 96-Well Plate and UHPLC-MS-MS
J Anal Toxicol, 45 (4), 378-388
DOI 10.1093/jat/bkaa108, PubMed 32816025

Publications 2018

Kristoffersen L, Langødegård M, Gaare KI, Amundsen I, Terland MN, Strand DH (2018)
Determination of 12 commonly found compounds in DUID cases in whole blood using fully automated supported liquid extraction and UHPLC-MS/MS
J Chromatogr B Analyt Technol Biomed Life Sci, 1093-1094, 8-23
DOI 10.1016/j.jchromb.2018.06.050, PubMed 29980102

Øiestad ÅML, Karinen R, Rogde S, Nilsen S, Boye Eldor KB, Brochmann GW, Arnestad M, Øiestad EL, Peres MD, Kristoffersen L, Vindenes V (2018)
Comparative Study of Postmortem Concentrations of Antidepressants in Several Different Matrices
J Anal Toxicol, 42 (7), 446-458
DOI 10.1093/jat/bky030, PubMed 29762694

Publications 2017

Hegstad S, Kristoffersen L, Liane VH, Spigset O (2017)
EtG and EtS in Autopsy Blood Samples With and Without Putrefaction Using UPLC-MS-MS
J Anal Toxicol, 41 (2), 107-113
DOI 10.1093/jat/bkw123, PubMed 27798076

Publications 2016

Høiseth G, Wiik E, Kristoffersen L, Mørland J (2016)
Ethanol elimination rates at low concentrations based on two consecutive blood samples
Forensic Sci Int, 266, 191-196
DOI 10.1016/j.forsciint.2016.05.039, PubMed 27295074

Publications 2015

Kristoffersen L, Strand DH, Liane VH, Vindenes V, Tvete IF, Aldrin M (2015)
Determination of safety margins for whole blood concentrations of alcohol and nineteen drugs in driving under the influence cases
Forensic Sci Int, 259, 119-26
DOI 10.1016/j.forsciint.2015.12.009, PubMed 26773222

Publications 2014

Eliassen E, Kristoffersen L (2014)
Quantitative determination of zopiclone and zolpidem in whole blood by liquid-liquid extraction and UHPLC-MS/MS
J Chromatogr B Analyt Technol Biomed Life Sci, 971, 72-80
DOI 10.1016/j.jchromb.2014.09.018, PubMed 25264915

Publications 2013

Amundsen I, Oiestad ÅM, Ekeberg D, Kristoffersen L (2013)
Quantitative determination of fifteen basic pharmaceuticals in ante- and post-mortem whole blood by high pH mobile phase reversed phase ultra high performance liquid chromatography-tandem mass spectrometry
J Chromatogr B Analyt Technol Biomed Life Sci, 927, 112-23
DOI 10.1016/j.jchromb.2012.12.039, PubMed 23380540

Vindenes V, Strand DH, Kristoffersen L, Boix F, Mørland J (2013)
Has the intake of THC by cannabis users changed over the last decade? Evidence of increased exposure by analysis of blood THC concentrations in impaired drivers
Forensic Sci Int, 226 (1-3), 197-201
DOI 10.1016/j.forsciint.2013.01.017, PubMed 23415163

Publications 2009

Hegstad S, Kristoffersen L, Christophersen AS, Khiabani HZ (2009)
[Drug testing in hair]
Tidsskr Nor Laegeforen, 129 (1), 36-8
DOI 10.4045/tidsskr.2009.0376, PubMed 19119295

Publications 2008

Gjerde H, Normann PT, Pettersen BS, Assum T, Aldrin M, Johansen U, Kristoffersen L, Øiestad EL, Christophersen AS, Mørland J (2008)
Prevalence of alcohol and drugs among Norwegian motor vehicle drivers: a roadside survey
Accid Anal Prev, 40 (5), 1765-72
DOI 10.1016/j.aap.2008.06.015, PubMed 18760106

Hegstad S, Khiabani HZ, Kristoffersen L, Kunøe N, Lobmaier PP, Christophersen AS (2008)
Drug screening of hair by liquid chromatography-tandem mass spectrometry
J Anal Toxicol, 32 (5), 364-72
DOI 10.1093/jat/32.5.364, PubMed 18544222

Publications 2007

Høiseth G, Kristoffersen L, Larssen B, Arnestad M, Hermansen NO, Mørland J (2007)
In vitro formation of ethanol in autopsy samples containing fluoride ions
Int J Legal Med, 122 (1), 63-6
DOI 10.1007/s00414-007-0166-6, PubMed 17387502

Publications 2006

Kristoffersen L, Stormyhr LE, Smith-Kielland A (2006)
Headspace gas chromatographic determination of ethanol: the use of factorial design to study effects of blood storage and headspace conditions on ethanol stability and acetaldehyde formation in whole blood and plasma
Forensic Sci Int, 161 (2-3), 151-7
DOI 10.1016/j.forsciint.2006.03.034, PubMed 16843627

Kristoffersen L, Øiestad EL, Opdal MS, Krogh M, Lundanes E, Christophersen AS (2006)
Simultaneous determination of 6 beta-blockers, 3 calcium-channel antagonists, 4 angiotensin-II antagonists and 1 antiarrhythmic drug in post-mortem whole blood by automated solid phase extraction and liquid chromatography mass spectrometry. Method development and robustness testing by experimental design
J Chromatogr B Analyt Technol Biomed Life Sci, 850 (1-2), 147-60
DOI 10.1016/j.jchromb.2006.11.030, PubMed 17175206

Publications 2005

Kristoffersen L, Skuterud B, Larssen BR, Skurtveit S, Smith-Kielland A (2005)
Fast quantification of ethanol in whole blood specimens by the enzymatic alcohol dehydrogenase method. Optimization by experimental design
J Anal Toxicol, 29 (1), 66-70
DOI 10.1093/jat/29.1.66, PubMed 15808017

Kristoffersen L, Smith-Kielland A (2005)
An automated alcohol dehydrogenase method for ethanol quantification in urine and whole blood
J Anal Toxicol, 29 (5), 387-9
DOI 10.1093/jat/29.5.387, PubMed 16105266

Publications 2002

Molander P, Thomassen A, Kristoffersen L, Greibrokk T, Lundanes E (2002)
Simultaneous determination of citalopram, fluoxetine, paroxetine and their metabolites in plasma by temperature-programmed packed capillary liquid chromatography with on-column focusing of large injection volumes
J Chromatogr B Analyt Technol Biomed Life Sci, 766 (1), 77-87
DOI 10.1016/s0378-4347(01)00433-9, PubMed 11820298

Publications 1999

Kristoffersen L, Bugge A, Lundanes E, Slørdal L (1999)
Simultaneous determination of citalopram, fluoxetine, paroxetine and their metabolites in plasma and whole blood by high-performance liquid chromatography with ultraviolet and fluorescence detection
J Chromatogr B Biomed Sci Appl, 734 (2), 229-46
DOI 10.1016/s0378-4347(99)00352-7, PubMed 10595721

Publications 1992

Hansen HB, Kristoffersen L, Lie E (1992)
En teknisk/økonomisk studie av ulike metoder for redusertgassemisjon fr a SiC-produksjon
[Forfatterene], Kristiansand, 44 bl. + vedlegg
BIBSYS 941413756