A. Christophersen

Tetrahydrocannabinol stability in whole blood: plastic versus glass containers.

A. Christophersen, 1986, Journal of analytical toxicology.

Stability Study of FifteenSynthetic Cannabinoids of Aminoalkylindole Type in Whole Blood, Stored in Vacutainer Evacuated Glass Tubes

E. Øiestad, W. Andresen, R. Karinen, 2013 .

Turbidimetric determination of prothrombin time by clotting in a centrifugal analyzer.

G. Gogstad, K. Dahl, A. Christophersen, 1986, Clinical chemistry.

TurbidimetricDeterminationof Prothrombin Time by Clottingin a Centrifugal Analyzer

K. Dahl, A. Christophersen, A. Bjerke, 1986 .

False-positive results with Emit II amphetamine/methamphetamine assay in users of common psychotropic drugs.

K. Olsen, A. Smith-Kielland, A. Christophersen, 1995, Clinical chemistry.

Metabolites of chlorpromazine and brompheniramine may cause false-positive urine amphetamine results with monoclonal EMIT d.a.u. immunoassay.

K. Olsen, M. Gulliksen, A. Christophersen, 1992, Clinical chemistry.