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

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

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 2013

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

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, 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

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

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 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