Positive Predictive Value
The positive and negative predictive values (PPV and NPV respectively) are the proportions of positive and negative results in statistics and diagnostic tests that are true positive and true negative results, respectively.[1] The PPV and NPV describe the performance of a diagnostic test or other statistical measure. A high result can be interpreted as indicating the accuracy of such a statistic. The PPV and NPV are not intrinsic to the test (as true positive rate and true negative rate are); they depend also on the prevalence.[2] Both PPV and NPV can be derived using Bayes’ theorem.
Although sometimes used synonymously, a positive predictive value generally refers to what is established by control groups, while a post-test probability refers to a probability for an individual. Still, if the individual’s pre-test probability of the target condition is the same as the prevalence in the control group used to establish the positive predictive value, the two are numerically equal.
In information retrieval, the PPV statistic is often called the precision.
Glossary Quick Search
Acardiac Twin
Achondrogenesis
Acrania
Agenesis of the Corpus Callosum
Amelia
Amniocentesis
Amniotic Band Syndrome
Anembryonic Pregnancy
Anencephaly
Aneuploidy
Aneuploidy Screening
Anhydramnios
Antenatal Surveillance
Aqueductal Stenosis
Arthrogryposis
Asphyxiating Thoracic Dystrophy (ATD)
Atelosteogenesis Type 2
Atrial Septal Defect
Autosomal Recessive
Autosomal Dominant
Atrioventricular Septal Defect (AVSD)
Camptomelic Dysplasia
Cardiac Rhabdomyoma
Carrier Screening
Caudal Regression Syndrome
Cell Free DNA
Chiari Malformation
Chloacal Anomaly
Chorionic Villus Sampling (CVS)
Choroid Plexus Cyst
Chromosomal Deletion
Chromosomal Duplication
Chromosomal Translocation
Chromosomes
Cleft Lip
Cleft Palate
Comfort Care
Congenital
Congenital Chylothorax
Congenital Heart Defect
Congenital High Airway Obstruction Syndrome (CHAOS)
Congenital Scoliosis
Craniopagus Conjoined Twins
Criss-Cross Heart
Cyanotic Heart Disease
Cystic Hygroma
Cytomegalovirus (CMV)
Pallister Killian Syndrome
Pediatric Hospice
Pediatric Paliative Care
Pena-Shokeir Syndrome
Pentalogy of Cantrell
Percutaneous Umbilical Blood Sampling (PUBS)
Pericardial Effusion
Perinatal Hospice
Perinatal Loss
Perinatal Palliative Care
Perinatal Period
Pleural Effusion
Polycystic Kidney Disease
Polyhydramnios
Porencephaly
Positive Predictive Value
Potter Syndrome
Pregnancy Continuation
Pregnancy Loss
Pregnancy Termination
Prenatal Diagnosis
Pulmonary Hypoplasia