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Prenatal Screening and Diagnosis, An Issue of the Clinics in Laboratory Medicine, E-Book

Prenatal Screening and Diagnosis, An Issue of the Clinics in Laboratory Medicine, E-Book

Anthony O. Odibo | David A. Krantz

(2016)

Abstract

This issue of Clinics in Laboratory Medicine, edited by Drs. Anthony Odibo and David A. Krantz, covers issues surrounding Prenatal Screening and Diagnosis. Topics examined in this issue include, but are not limited to: Strategies for Implementing cfDNA Testing; Genetic Counselling for Patients Considering Screening and Diagnosis of Chromosomal Abnormalities; Microdeletions/Duplications; Sex Chromosome Abnormalities; First-, Second- and Third-Trimester Screening for Preeclampsia and Intrauterine Growth Restriction; Biophysicial/Biochemical Screening for the Risk of Preterm Labor; Preimplantation Genetic Testing; Toxoplasmosis, Parvovirus and Cytomegalovirus in Pregnancy; and Sleep Apnea and Adverse pregnancy Outcomes.

Table of Contents

Section Title Page Action Price
Front Cover Cover
Prenatal Screening andDiagnosis: An Update i
Copyright\r ii
Contributors iii
EDITORS iii
AUTHORS iii
Contents vii
Preface: Prenatal Screening: The Birth of a New Era\r vii
Cell-free DNA: Comparison of Technologies\r vii
Strategies for Implementing Cell-Free DNA Testing\r vii
Genetic Counseling for Patients Considering Screening and Diagnosis for Chromosomal Abnormalities\r vii
Cost-Effectiveness of Old and New Technologies for Aneuploidy Screening\r viii
Modifying Risk of Aneuploidy with a Positive Cell-Free Fetal DNA Result\r viii
Chromosomal Microarrays for the Prenatal Detection of Microdeletions and Microduplications\r viii
Genetic Carrier Screening in the Twenty-first Century\r viii
Screening and Testing in Multiples\r ix
Inverted Pyramid of Care\r ix
Aspirin for the Prevention of Preeclampsia and Intrauterine Growth Restriction\r ix
First-, Second-, and Third-Trimester Screening for Preeclampsia and Intrauterine Growth Restriction\r x
Maternal Serum Analytes as Predictors of Fetal Growth Restriction with Different Degrees of Placental Vascular Dysfunction\r x
Biophysical and Biochemical Screening for the Risk of Preterm Labor: An Update\r x
The Past, Present, and Future of Preimplantation Genetic Testing\r x
Screening for Open Neural Tube Defects\r xi
Toxoplasmosis, Parvovirus, and Cytomegalovirus in Pregnancy\r xi
Prenatal Screening for Thrombophilias: Indications and Controversies, an Update\r xi
Sleep Disordered Breathing and Adverse Pregnancy Outcomes\r xii
CLINICS IN LABORATORY MEDICINE\r xiii
FORTHCOMING ISSUES xiii
September 2016 xiii
December 2016 xiii
March 2017 xiii
RECENT ISSUES xiii
March 2016 xiii
December 2015 xiii
September 2015 xiii
Preface\rPrenatal Screening: The Birth of a New Era xv
Cell-free DNA 199
Key points 199
INTRODUCTION 199
CELL-FREE DNA 200
DNA 201
SCREENING FOR ANEUPLOIDY 201
THE MASSIVE PARALLEL SHOTGUN SEQUENCING APPROACH 201
THE TARGETED MASSIVELY PARALLEL SEQUENCING APPROACH 203
THE SINGLE NUCLEOTIDE POLYMORPHISM APPROACH 203
SCREENING FOR ANEUPLOIDY: INVESTIGATIONAL APPROACHES 204
ASSAY 205
FREE FETAL RNA IN MATERNAL PLASMA 205
REINTRODUCTION OF FETAL CELLS 205
ENDOCERVICAL FETAL TROPHOBLASTS 206
DNA IN PRENATAL SCREENING 207
REFERENCES 207
Strategies for Implementing Cell-Free DNA Testing 213
Key points 213
INTRODUCTION 213
Screening Tests 214
Conventional Down Syndrome Screening 214
Types of Cell-Free DNA Test 214
Discriminatory Power of Cell-Free DNA Testing for Down Syndrome 216
Cell-Free DNA Screening Strategies 216
Cost-Effectiveness 216
Test No-Calls 218
Cell-Free DNA Performance for Other Aneuploidies 219
Reasons for False-Positive and False-Negative Results 221
Biological causes of false-positive cell-free DNA results 221
Biological causes of false-negative cell-free DNA results 222
Twins 222
Subchromosomal Abnormalities 223
Continuing Role for Nuchal Translucency and First-Trimester Markers 223
REFERENCES 223
Genetic Counseling for Patients Considering Screening and Diagnosis for Chromosomal Abnormalities 227
Key points 227
INTRODUCTION 227
PRETEST COUNSELING 228
USE OF EDUCATIONAL TOOLS 229
SCREENING VERSUS DIAGNOSTIC TESTING 229
COUNSELING AFTER POSITIVE ANEUPLOIDY SCREENING 231
RECOGNITION OF THE IMPORTANCE OF PATIENT VALUES AND PREFERENCES IN DECISION MAKING 231
INDICATIONS FOR GENETIC COUNSELING 232
GENETIC COUNSELING AFTER ABNORMAL DIAGNOSTIC TESTING 233
GENETIC NONDISCRIMINATION ACT 234
SUMMARY 234
REFERENCES 234
Cost-Effectiveness of Old and New Technologies for Aneuploidy Screening 237
Key points 237
INTRODUCTION 237
ECONOMIC ANALYSES IN HEALTH CARE 238
COST-EFFECTIVENESS ANALYSIS OF THE PRENATAL DIAGNOSIS 239
Down Syndrome Screening and Diagnosis 240
ECONOMIC ANALYSES OF FIRST-TRIMESTER SCREENING FOR DOWN SYNDROME 240
Cost-Effectiveness of Contingent Screening 242
COST-EFFECTIVENESS OF CHROMOSOMAL MICROARRAY 242
COST-EFFECTIVENESS OF NONINVASIVE PRENATAL SCREENING 243
LIMITATIONS INHERENT ON ECONOMIC ANALYSES METHODOLOGY 245
SUMMARY 246
ACKNOWLEDGMENTS 246
REFERENCES 246
Modifying Risk of Aneuploidy with a Positive Cell-Free Fetal DNA Result 249
Key points 249
BACKGROUND 249
CELL-FREE FETAL DNA IN SCREENING FOR ANEUPLOIDY 251
FETAL DNA SCREENING 252
UNRECOGNIZED MULTIFETAL PREGNANCY 252
VANISHING TWIN SYNDROME 253
CONFINED PLACENTAL MOSAICISM 253
MATERNAL MOSAICISM 254
HISTORY OF MATERNAL ORGAN TRANSPLANT 254
OCCULT MATERNAL MALIGNANCY 254
SELECTING APPROPRIATE CANDIDATES FOR NONINVASIVE PRENATAL TESTING SCREENING 255
USE OF PRENATAL ULTRASOUND SCANS 255
THE FUTURE 256
SUMMARY 257
REFERENCES 257
Chromosomal Microarrays for the Prenatal Detection of Microdeletions and Microduplications 261
Key points 261
INTRODUCTION 262
BASIC INTRODUCTION TO MICROARRAY 262
Comparative Genomic Hybridization–Based Arrays 262
Single Nucleotide Polymorphism Arrays 264
Targeted Versus Whole-Genome Arrays 265
Benefits of Chromosomal Microarray Analysis Compared with Karyotype for Diagnostic Prenatal Diagnosis 266
Limitations of Chromosomal Microarray Analysis 266
MICRODELETIONS AND DUPLICATIONS SYNDROMES 266
Clinical Utility of Chromosomal Microarray Analysis in Prenatal Diagnosis 266
PRETEST AND POSTTEST GENETIC COUNSELING 271
NONINVASIVE PRENATAL TESTING 271
REFERENCES 272
Genetic Carrier Screening in the Twenty-first Century 277
Key points 277
INTRODUCTION 277
CYSTIC FIBROSIS 278
CARRIER SCREENING FOR JEWISH GENETIC DISORDERS 280
SPINAL MUSCULAR ATROPHY 282
EXPANDED CARRIER SCREENING PANELS 284
REFERENCES 286
Screening and Testing in Multiples 289
Key points 289
MULTIPLE PREGNANCIES 289
Risks of Anomalies 290
Counseling 290
Documentation and identification 291
Aneuploidy Screening 292
Diagnostic Procedures 294
Amniocentesis 294
Amniocentesis in monochorionic twins 295
Fetal loss rate 295
Chorionic villus sampling 296
Fetal loss rate 297
Microarrays 298
FETAL REDUCTION 298
CHORIONIC VILLUS SAMPLING AND FETAL REDUCTION 298
SUMMARY 299
REFERENCES 300
Inverted Pyramid of Care 305
Key points 305
INTRODUCTION 305
FIRST-TRIMESTER SCREENING FOR FETAL ANEUPLOIDY 306
First-Trimester Screening for Down Syndrome: Performance and Cost-Benefit 307
FIRST-TRIMESTER DETECTION OF FETAL STRUCTURAL ABNORMALITIES 309
Screening and Diagnosis of Structural Congenital Defects 309
First-Trimester Detection of Congenital Cardiac Defects 309
First-Trimester Detection of Open Neural Tube Defects 310
FIRST-TRIMESTER ASSESSMENT OF MULTIPLE GESTATIONS 310
FIRST-TRIMESTER PREDICTION OF MATERNAL-FETAL COMPLICATIONS 311
FUTURE APPLICATIONS OF FIRST-TRIMESTER SCREENING PROTOCOLS 312
FIRST-TRIMESTER ESTIMATION OF GESTATIONAL AGE 312
SUMMARY 313
REFERENCES 313
Aspirin for the Prevention of Preeclampsia and Intrauterine Growth Restriction 319
Key points 319
INTRODUCTION 319
Preeclampsia 320
Low-Dose Aspirin for the Prevention of Preeclampsia 320
Intrauterine Growth Restriction 321
Low-Dose Aspirin for the Prevention of Intrauterine Growth Restriction 321
Who Should Receive Low-Dose Aspirin in Early Gestation? 321
Low-Dose Aspirin Posology 324
Low Molecular Weight Heparin 324
SUMMARY 325
REFERENCES 325
First-, Second-, and Third-Trimester Screening for Preeclampsia and Intrauterine Growth Restriction 331
Key points 331
INTRODUCTION 331
PATHOPHYSIOLOGY 332
SCREENING TESTS FOR PREECLAMPSIA AND INTRAUTERINE GROWTH RESTRICTION 332
Clinical Factors 333
Placenta Perfusion Dysfunction Related 334
Uterine artery Doppler velocimetry 334
Three-dimensional placenta imaging 335
Placental quotient 335
Placental vascular indices 336
Two-dimensional placenta imaging 336
Maternal Serum Analytes 337
Fetal and placental endocrine dysfunction-related tests 338
Down syndrome markers 338
A disintegrin and metalloproteases 338
Placental protein 13 339
Endothelial dysfunction-related tests 339
Circulating angiogenic factors 339
Endothelial cell adhesion molecules 340
Markers of insulin resistance 340
Genomics and Proteomics 340
Combination of Tests 341
Third-Trimester Serum and Ultrasound Markers for Prediction of Preeclampsia and Intrauterine Growth Restriction 342
Biochemical markers in the third trimester 342
Use of Doppler Ultrasonography for the Prediction of Preeclampsia and Intrauterine Growth Restriction in the Third Trimester 343
SUMMARY AND FUTURE PERSPECTIVES 344
REFERENCES 344
Maternal Serum Analytes as Predictors of Fetal Growth Restriction with Different Degrees of Placental Vascular Dysfunction 353
Key points 353
INTRODUCTION 353
FETAL GROWTH RESTRICTION 355
MATERNAL SERUM ANALYTES 355
Overview 355
First- and Second-Trimester Biomarkers 356
Human chorionic gonadotropin 356
Pregnancy-associated plasma protein-A 356
α-Fetoprotein 357
Unconjugated estriol 357
Inhibin A 357
Combinations of Biomarkers 357
PLACENTAL VASCULAR DYSFUNCTION 358
Overview 358
Uterine Artery Doppler 358
Umbilical Artery Doppler 359
Placental Pathology 360
SUMMARY 362
REFERENCES 362
Biophysical and Biochemical Screening for the Risk of Preterm Labor 369
Key points 369
CERVICAL LENGTH ASSESSMENT 370
Rationale 370
Sonographic Technique for Cervical Length Assessment 372
FETAL FIBRONECTIN 374
Rationale 374
Technique 375
GESTATIONAL AGE AND RISK-SPECIFIC APPROACH TO USING CERVICAL LENGTH AND FETAL FIBRONECTIN IN CLINICAL EVALUATION AND MANAGEMENT 377
Earlier than 24 Weeks’ Gestation 378
Cervical length and cerclage 378
Cervical length and progesterone 379
24 to 34 Weeks’ Gestation 379
SUMMARY 380
REFERENCES 381
The Past, Present, and Future of Preimplantation Genetic Testing 385
Key points 385
INTRODUCTION 385
HISTORIC PERSPECTIVE AND DEFINITION 386
INDICATIONS FOR PREIMPLANTATION GENETIC DIAGNOSIS 387
TECHNIQUES 389
GENOMIC TESTING OF SINGLE GENE DISORDER 390
DIAGNOSTIC PLATFORMS FOR PREIMPLANTATION GENETIC SCREENING 391
DIAGNOSTIC ACCURACY 391
CONTROVERSIES SURROUNDING PREIMPLANTATION GENETIC TESTING 393
FUTURE OF PREIMPLANTATION GENETIC TESTING: POLICY AND ACCESS 393
SUMMARY 394
ACKNOWLEDGMENTS 394
REFERENCES 395
Screening for Open Neural Tube Defects 401
Key points 401
REFERENCES 405
Toxoplasmosis, Parvovirus, and Cytomegalovirus in Pregnancy 407
Key points 407
TOXOPLASMOSIS 407
DIAGNOSIS 408
TREATMENT 409
PREVENTION 410
PARVOVIRUS 410
DIAGNOSIS OF MATERNAL INFECTION 411
DIAGNOSIS OF FETAL INFECTION 411
MANAGEMENT OF PARVOVIRUS B19 INFECTION DURING PREGNANCY 412
NEONATAL OUTCOMES AFTER PARVOVIRUS INFECTION 413
CYTOMEGALOVIRUS 413
MATERNAL INFECTION 414
FETAL INFECTION 414
TREATMENT 415
SUMMARY 415
REFERENCES 416
Prenatal Screening for Thrombophilias 421
Key points 421
INTRODUCTION 421
INHERITED THROMBOPHILIAS 422
Factor V Leiden 422
Prothrombin Gene (G20210A) 422
Protein C 425
Protein S 425
Antithrombin III Deficiency 425
THROMBOPHILIA TESTING 426
ACQUIRED THROMBOPHILIAS 426
Antiphospholipid Antibody Syndrome 426
Antiphospholipid Antibodies 427
ADVERSE PREGNANCY OUTCOMES 427
PREGNANCY LOSS 427
Acquired Thrombophilia 427
Inherited Thrombophilia 427
PREECLAMPSIA 428
Acquired Thrombophilia 428
Inherited Thrombophilia 428
FETAL GROWTH RESTRICTION 429
Acquired Thrombophilia 429
Inherited Thrombophilia 429
PLACENTAL ABRUPTION 429
SUMMARY 429
REFERENCES 430
Sleep Disordered Breathing and Adverse Pregnancy Outcomes 435
Key points 435
INTRODUCTION 435
EPIDEMIOLOGY 435
RISK FACTORS 436
SCREENING IN PREGNANCY 436
DIAGNOSIS IN PREGNANCY 437
OBSTRUCTIVE SLEEP APNEA AND PREGNANCY MORBIDITY 438
Potential Mechanisms for Adverse Pregnancy Outcomes 438
Hypertensive Disorders of Pregnancy 439
Diabetes in Pregnancy 440
Severe Maternal Morbidity 440
Cesarean Delivery 440
Fetal Effects 440
Growth Abnormalities 440
Preterm Delivery 441
Miscarriages and Stillbirth 441
TREATMENT 442
SUMMARY 442
REFERENCES 442