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- Dahl, F, et al.
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Imaging single DNA molecules for high precision NIPT
- 2018
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In: Scientific reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 8:1, s. 4549-
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Journal article (peer-reviewed)abstract
- Cell-free DNA analysis is becoming adopted for first line aneuploidy screening, however for most healthcare programs, cost and workflow complexity is limiting adoption of the test. We report a novel cost effective method, the Vanadis NIPT assay, designed for high precision digitally-enabled measurement of chromosomal aneuploidies in maternal plasma. Reducing NIPT assay complexity is achieved by using novel molecular probe technology that specifically label target chromosomes combined with a new readout format using a nanofilter to enrich single molecules for imaging and counting without DNA amplification, microarrays or sequencing. The primary objective of this study was to assess the Vanadis NIPT assay with respect to analytical precision and clinical feasibility. Analysis of reference DNA samples indicate that samples which are challenging to analyze with low fetal-fraction can be readily detected with a limit of detection determined at <2% fetal-fraction. In total of 286 clinical samples were analysed and 30 out of 30 pregnancies affected by trisomy 21 were classified correctly. This method has the potential to make cost effective NIPT more widely available with more women benefiting from superior detection and false positive rates.
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- Envall, Niklas, 1984-, et al.
(author)
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Evaluation of satisfaction with a model of structured contraceptive counseling : Results from the LOWE trial
- 2021
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In: Acta Obstetricia et Gynecologica Scandinavica. - : Wiley. - 0001-6349 .- 1600-0412. ; 100:11, s. 2044-2052
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Journal article (peer-reviewed)abstract
- Introduction: Intervention trials of structured contraceptive counseling have proved to increase use of long-acting reversible contraceptives (LARCs) and decrease numbers of unintended pregnancies. However, these interventions have not been evaluated from a user perspective. This study aimed to evaluate both healthcare providers’ and participants’ satisfaction with an intervention used in a large trial in Sweden. Material and methods: A cross-sectional study on the intervention group from a cluster randomized trial conducted at 28 clinics in Stockholm, Sweden. Clinics were randomized (1:1 allocation ratio) to provide either structured contraceptive counseling (intervention) or standard contraceptive counseling (control). The intervention consisted of four parts; an educational video to be seen by the participant prior to contraceptive counseling, key questions to be asked by the healthcare provider, an effectiveness chart, and a box of contraceptive models. Eligible participants were 18 years or older, sexually active without a wish to conceive, and with the main purpose of contraceptive use being pregnancy prevention. Healthcare providers completed an electronic semi-structured survey to evaluate the intervention. This study analyses provider and participant satisfaction with the counseling material used in the intervention and if the intervention was found to be supportive in contraceptive counseling and contraceptive choice. Trial registration: ClinicalTrials.gov (NCT03269357). Results: Fourteen intervention clinics enrolled 658 participants from September 2017 to May 2019. Response rate among providers was 88.0% (55/62) and among participants 97.1% (639/658). Providers found the intervention to be supportive in their counseling. Each separate part of the intervention package received high ratings from both providers and participants. Participants found the educational video and the effectiveness chart to be more helpful than the box of contraceptive models in their contraceptive choice. Providers reported the time taken to complete the intervention outside the study to be time-neutral to standard counseling, and most providers wished to continue to use all parts of the intervention package. Conclusions: The intervention of structured contraceptive counseling had high provider and participant satisfaction. The structured counseling package could be used in several clinical settings to improve quality in contraceptive counseling and to enhance informed decision making about use of contraceptive methods. © 2021 The Authors. Acta Obstetricia et Gynecologica Scandinavica published by John Wiley & Sons Ltd on behalf of Nordic Federation of Societies of Obstetrics and Gynecology (NFOG)
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