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Reference Intervals for Fecal Calprotectin in Adults Using Two Different Extraction Methods in the Uppsala-SCAPIS Cohort.
Fall T, Mandic-Havelka A, Helmersson-Karlqvist J, Sundstrom J, Larsson A. Fall T, et al. Among authors: helmersson karlqvist j. Clin Lab. 2017 Sep 1;63(9):1493-1496. doi: 10.7754/Clin.Lab.2017.170412. Clin Lab. 2017. PMID: 28879709
Estimation of the possible economic effects of a sequential testing strategy with NT-proBNP before echocardiography in primary care.
Khezri BS, Helmersson-Karlqvist J, Larsson A. Khezri BS, et al. Clin Lab. 2014;60(6):881-6. doi: 10.7754/clin.lab.2013.130613. Clin Lab. 2014. PMID: 25016690
Normal values for calprotectin in stool samples of infants from the population-based longitudinal born into life study.
Peura S, Fall T, Almqvist C, Andolf E, Hedman A, Pershagen G, Helmersson-Karlqvist J, Larsson A. Peura S, et al. Among authors: helmersson karlqvist j. Scand J Clin Lab Invest. 2018 Feb-Apr;78(1-2):120-124. doi: 10.1080/00365513.2017.1420216. Epub 2017 Dec 28. Scand J Clin Lab Invest. 2018. PMID: 29283308
Reference Intervals for Fecal Calprotectin in Pregnant Women Using a Particle Enhanced Turbidimetric Assay.
Fall T, Hedman A, Pershagen G, Andolf E, Almqvist C, Helmersson-Karlqvist J, Larsson A. Fall T, et al. Among authors: helmersson karlqvist j. Clin Lab. 2019 Jul 1;65(7). doi: 10.7754/Clin.Lab.2019.190104. Clin Lab. 2019. PMID: 31307176
Day-to-day variation of the kidney proximal tubular injury markers urinary cystatin C, KIM1, and NGAL in patients with chronic kidney disease.
Soveri I, Helmersson-Karlqvist J, Fellström B, Larsson A. Soveri I, et al. Among authors: helmersson karlqvist j. Ren Fail. 2020 Nov;42(1):400-404. doi: 10.1080/0886022X.2020.1757463. Ren Fail. 2020. PMID: 32349578 Free PMC article.
Seasonal variability of NT-proBNP in Swedish primary care patients.
Khezri BS, Cederblad M, Helmersson-Karlqvist J, Karlsson B, Melhus H, Larsson A. Khezri BS, et al. Among authors: helmersson karlqvist j. Chronobiol Int. 2017;34(10):1473-1477. doi: 10.1080/07420528.2017.1366500. Epub 2017 Sep 14. Chronobiol Int. 2017. PMID: 28910541
Evaluation of Nova StatStrip and FreeStyle Precision Pro blood ketone tests using 3-hydroxybutyrate doped samples.
Helmersson-Karlqvist J, Höög Hammarström K, Palmberg K, Backman-Johansson C. Helmersson-Karlqvist J, et al. J Clin Lab Anal. 2019 May;33(4):e22851. doi: 10.1002/jcla.22851. Epub 2019 Feb 27. J Clin Lab Anal. 2019. PMID: 30811634 Free PMC article.
The age related association is more pronounced for cystatin C estimated GFR than for creatinine estimated GFR in primary care patients.
Helmersson-Karlqvist J, Flodin M, Hansson LO, Larsson A. Helmersson-Karlqvist J, et al. Clin Biochem. 2013 Nov;46(16-17):1761-3. doi: 10.1016/j.clinbiochem.2013.07.007. Epub 2013 Jul 19. Clin Biochem. 2013. PMID: 23872205
Lower creatinine concentration values and lower inter-laboratory variation among Swedish hospital laboratories in 2014 compared to 1996: results from the Equalis external quality assessment program.
Helmersson-Karlqvist J, Ridefelt P, Boija EE, Nordin G. Helmersson-Karlqvist J, et al. Clin Chem Lab Med. 2019 May 27;57(6):838-844. doi: 10.1515/cclm-2018-0670. Clin Chem Lab Med. 2019. PMID: 30982002 Free article.
The Roche Immunoturbidimetric Albumin Method on Cobas c 501 Gives Higher Values Than the Abbott and Roche BCP Methods When Analyzing Patient Plasma Samples.
Helmersson-Karlqvist J, Flodin M, Havelka AM, Xu XY, Larsson A. Helmersson-Karlqvist J, et al. J Clin Lab Anal. 2016 Sep;30(5):677-81. doi: 10.1002/jcla.21921. Epub 2016 May 12. J Clin Lab Anal. 2016. PMID: 27169354 Free PMC article.
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