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SOCIAL IMPLICATIONS OF GENETIC PRENATAL SCREENING IN PREGNANCY
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Innovative Health Technologies Programme Projects funded in the area of genetics Pregnancy & Childbirth ä Definitions of Genetic Knowledge and Pre- Implantation Genetic Diagnosis ä Social & Ethnic Differences in attitudes & consent to prenatal testing ä The Technological Management of Childbirth - risk, empowerment & professional accountability ä Social Implications of One Stop First Trimester Prenatal Screening
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Innovative Health Technologies Programme Projects funded in the area of genetics Other types of genetic screening ä The construction of risk estimates in a cancer genetics clinic ä Genetic screening for Susceptibility to Disease: The Case of Haemochromatosis
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Projects On The Social Implications Of Genetics
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SETTINGSClinicsHospitalsHomes
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ISSUES COMMON TO MOST OF THE PROJECTS IN GENETICS ä The management and meaning of risk ä The impact of technologies in the workplace ä The impact of technologies on women, patients and their families ä The process of explanation and decision making
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Researching Innovative Technologies is involving ä Development of innovative social science methods ä Crossing disciplinary and professional domains ä Dialogue on the social negotiation of genetic information and choice
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Social Implications of One Stop First Trimester Prenatal Screening ä Professor GA Lewando- Hundt ä Professor Jane Sandall ä Professor Bob Heyman ä Dr Kevin Spencer ä Dr Clare Williams ä Rachel Grellier ä Warwick University ä King’s College, London ä City University, London ä Barking, Havering & Redbridge NHS Trust ä King’s College, London ä Warwick University
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Prenatal Screening for Trisomy 21 Conventional Second Trimester (15-18 weeks) Approach ä Maternal blood test to measure a combination of 2 to 4 biochemical markers in a batched process in a centralised lab. ä Patient specific risk reported to ANC 2 to 4 days later. 5-6% of women identified “At Risk” ä “At Risk” women brought back for counselling re. Invasive Diagnostic Test
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Prenatal Screening for Trisomy 21 Conventional Second Trimester (15-18 weeks) Approach ä Amniocentesis performed - fluid sent away to Regional Reference Lab. ä 2 to 3 weeks later diagnosis reported to ANC ä Patient returns for further counselling. ä TOP if considered appropriate around 21 weeks -some 32 days after initial screen. ä DR 70% FPR 5% No of invasive procedures per case detected is 55
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OSCAR - A One Stop Clinic for Assessment of Risk for fetal anomalies. Kevin Spencer Endocrine Unit,Clinical Biochemistry Dept., Harold Wood Hospital, Romford, U.K.
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Developments & Innovations Leading to OSCAR ä Ultrasound markers of chromosomal anomalies - fetal nuchal translucency thickness at 10-13 weeks.
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Increased fetal nuchal translucency thickness in a case of T21 Head Upper limbs Lower limbs NT
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Developments & Innovations Leading to OSCAR ä Ultrasound markers of chromosomal anomalies - fetal nuchal translucency thickness at 10-13 weeks. Biochemical markers of chromosomal anomalies - free hCG & PAPP-A at 10-13 weeks.
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Developments & Innovations Leading to OSCAR ä Ultrasound markers of chromosomal anomalies - fetal nuchal translucency thickness at 10-13 weeks. Biochemical markers of chromosomal anomalies - free hCG & PAPP-A at 10-13 weeks. ä Development of new rapid assay technology for biochemical marker measurement.
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Kryptor Analyser Nobel Prize winning chemistry ä Small bench top analyser - clinic based ä Rapid assay times (19 mins) ä Kinetic reading - leading to automatic rediluting of high samples within 4 minutes ä Precise - cv less than 3% between day ä Continuous sample access - stat capability ä Small sample (<50ul) and reagent (<150ul) volumes. ä User friendly
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Developments & Innovations Leading to OSCAR ä Ultrasound markers of chromosomal anomalies - fetal nuchal translucency thickness at 10-13 weeks. Biochemical markers of chromosomal anomalies - free hCG & PAPP-A at 10-13 weeks. ä Development of new rapid assay technology for biochemical marker measurement. ä Predicted DR 90% for 5% FPR. No of invasive procedures per case detected is 30
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OSCAR clinic flow Patient booked for a 13:00 appointment (15 minute intervals)
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Professional Interactions OSCAR Midwives Support Workers Obstetricians Technologists Ultrasonographers
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Prospective First Trimester Screening June ‘98 - May ‘99 ä Total births4397 ä Women offered screening4190 (95.3%) ä Women accepting4088 (97.6%) ä 88% of T21 cases detected & 95% of all Chromosomal anomalies over past 2 years Spencer et al (2000) BJO&G 107;1271
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Screening options - time scales ä 2nd trimester biochemistry - results usually within 3 days, amniocentesis within 3 days, diagnostic test results 3- 4 weeks after screening. ä 1st trimester NT&Biochem - results within 1 hour, CVS within 2 days, diagnostic test results 7-10 days after screening.
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Aim of study ä To explore and compare the risks and benefits of innovative and established models of genetic prenatal screening as defined, perceived and communicated by health professionals and pregnant women.
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Research questions ä Do innovative prenatal screening methods for foetal anomalies impact differently on the social management of screening and testing ? ä What are the experiences of women of innovative and established genetic prenatal screening systems ? ä Do inter-professional roles, and relationships between professionals and clients, change ?
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Research questions ä How do innovative and established prenatal screening systems affect women’s conceptions of self, and of the foetus ? ä How do they impact on the management of reproductive risk in the clinic and the home ?
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Theoretical background ä Social context of reproduction and reproductive technologies ä Contrasting understandings of risk ä Sociology of the professional and expert groups
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Methods ä Research will take place at two sites: one offering the innovative one stop approach, the other offers conventional second trimester prenatal screening. ä Multi-method approach ä Perspectives on clinic consultations at critical screening junctures with a sub-sample from health professionals and women.
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Methods ä Focus groups with health professionals ä Survey of representative sample of women examining expectations about, and reflections on different screening processes.
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Contribution to the IHT programme The study will offer insights into:- ä Participants’ broader response to the new emerging technology of prenatal screening; their views about its routinisation and notions of genetic responsibility. ä The impact of new screening technologies on, and the social management of pregnancy and interprofessional relationships, between obstetrics, midwifery and biomedicine.
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Contribution to the IHT programme The study will offer insights into:- ä The social context of pregnancy, and perspectives on identity and the body. ä Understanding of complex probabilistic information and of risk.
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