Ann Helen Kristoffersen

The European Biological Variation Study (EuBIVAS): Biological Variation Data for Coagulation Markers Estimated by a Bayesian Model

Aasne K. Aarsand, Ann Helen Kristoffersen, Sverre Sandberg et al. · Clinical Chemistry · 2021 · 31 citations · Full text

Estimates of Within-Subject Biological Variation of Protein C, Antithrombin, Protein S Free, Protein S Activity, and Activated Protein C Resistance in Pregnant Women

Ann Helen Kristoffersen, Per Hyltoft Petersen, Thomas Røraas et al. · Clinical Chemistry · 2017 · 25 citations · Full text

Is D-dimer used according to clinical algorithms in the diagnostic work-up of patients with suspicion of venous thromboembolism? A study in six European countries

Ann Helen Kristoffersen, Éva Ajzner, Dunja Rogić et al. · Thrombosis Research · 2016 · 22 citations

Thrombosis, Pulmonary Embolism, Diagnostic Work-up +12

An international study of how laboratories handle and evaluate patient samples after detecting an unexpected APTT prolongation

Éva Ajzner, Dunja Rogić, Piet Meijer et al. · Clinical Chemistry and Laboratory Medicine (CCLM) · 2015 · 13 citations · Full text

Impact of different preanalytical conditions on results of lupus anticoagulant tests

Ann Helen Kristoffersen, Ida Jansrud Hammer, Solveig Vannes et al. · International Journal of Laboratory Hematology · 2019 · 12 citations · Full text