Adjusted risk for trisomy 21 after the anomaly scan. How accurate is the Fetal Medicine Foundation algorithm?

00:07 EDT 30th July 2015 | BioPortfolio

Summary of "Adjusted risk for trisomy 21 after the anomaly scan. How accurate is the Fetal Medicine Foundation algorithm?"


PURPOSE:
To examine the accuracy of the Fetal Medicine Foundation algorithm used to adjust the risk for trisomy 21 after ultrasound findings detected or not at the time of the anomaly scan.
METHODS:
This was a retrospective study of all amniocenteses performed in a single centre, in singleton pregnancies, between 1998 and 2008. Maternal demographic characteristics, second-trimester ultrasound findings, indications for amniocentesis and karyotype results were reviewed. The algorithm introduced by the Fetal Medicine Foundation was used to calculate the patient specific risk for trisomy 21 using the age related background risk and anomaly scan findings. Expected trisomy 21 cases based on these risks was compared with the actual karyotype results.
RESULTS:
Overall, 4,511 cases of singleton pregnancies that underwent second-trimester amniocentesis were reviewed. In 572 cases (12.7%), there were markers of chromosomal abnormality and no previous screening for trisomy 21. The expected number of trisomy 21 cases based on maternal age for this population of 572 cases was 1. The expected number of chromosomal abnormalities after adjusting for ultrasound findings based on the algorithm introduced by the Fetal Medicine Foundation was 6.9 (95% confidence interval 3.4-14.3). After karyotyping, in this population there were 6 cases of trisomy 21, 1 case of Trisomy 18 and 1 case of XXY.
CONCLUSIONS:
The algorithm that adjusts the age related risk of trisomy 21 according to second-trimester anomaly scan findings is very accurate in predicting the modified risk.

Affiliation

Iakentro Medical Center, 22 Tritonos Str, 54351, Thessaloniki, Greece, tdagklis@hotmail.com.

Journal Details

This article was published in the following journal.

Name: Archives of gynecology and obstetrics
ISSN: 1432-0711
Pages:

Links

PubMed Articles [17512 Associated PubMed Articles listed on BioPortfolio]

Early second trimester transvaginal ultrasound anomaly scan does not cause adverse perinatal outcome.

During an early second-trimester transvaginal ultrasound anomaly scan, pressure is applied to the uterus, and the fetus is often rotated manually to allow scanning of its various organs. This study wa...

Background Knowledge and Attitude of Pregnant Women towards Ultrasound Screening at 20-23 Weeks Gestation.

Background: Prenatal ultrasound screening in the second trimester is widely used in maternal health care. Prenatal diagnosis and prenatal screening is often exposed to several accusation, such as indu...

How effective is ultrasound-based screening for trisomy 18 without the addition of biochemistry at the time of late first trimester?

Trisomy 18 (T18) remains the second most common aneuploidy. It is associated with multiple congenital anomalies and causes intrauterine fetal demise in the most severe cases.

Trisomy 13 and massive fetomaternal hemorrhage.

This is the first case report of trisomy 13 complicated by massive fetomaternal hemorrhage (FMH). A pale male infant weighing 2,950 g was delivered with low Apgar scores by emergency cesarean section ...

Noninvasive prenatal testing-the importance of pre-test trisomy risk and post-test predictive values.

Noninvasive prenatal testing (NIPT), based on isolation of cell-free fetal DNA from maternal blood, is a highly efficient screening test for trisomies 21, 18, and 13.(1,2) Guidelines recommend reservi...

Clinical Trials [3240 Associated Clinical Trials listed on BioPortfolio]

Non-Invasive Determination of Fetal Chromosome Abnormalities

The overall significance of this study is to develop a laboratory developed test (LDT) to use a new marker in the maternal blood to better identify pregnancies that have a child with a chr...

Non Invasive Prenatal Diagnosis of Trisomy 21 by Genetic Analysis of Circulating Fetal Cells

The objective of this project is to develop a non-invasive prenatal diagnostic test for trisomy 21 which is reliable, sensitive and cost-effective, and thus, offers an alternative to the c...

Non-Invasive Screening for Fetal Aneuploidy: A New Maternal Plasma Marker

Validate that circulating cell free fetal nucleic acid can be used to identify a direct marker for fetal aneuploidy, particularly fetal Down Syndrome (DS), that is better than surrogate ma...

The 3-Dimensional Ultrasound for Fetal Anomaly Scan

The aim of this study is 1) to study the clinical application of 3D/4D ultrasound for fetal scanning during pregnancy; 2) ) to study the clinical application of 3D/4D ultrasound for pelvic...

Fetal Anatomy by Three-Dimensional Ultrasound

A major goal of perinatal care is to accurately diagnose fetal anomalies prior to birth. This capability allows clinicians to make prudent decisions regarding antepartum care, delivery sit...

Medical and Biotech [MESH] Definitions

Congenital anomaly in which some of the structures of the eye are absent due to incomplete fusion of the fetal intraocular fissure during gestation.

A nonreassuring fetal status (NRFS) indicating that the FETUS is compromised (American College of Obstetricians and Gynecologists 1988). It can be identified by sub-optimal values in FETAL HEART RATE; oxygenation of FETAL BLOOD; and other parameters.

A complication of pregnancy in which the UMBILICAL CORD wraps around the fetal neck once or multiple times. In some cases, cord entanglement around fetal neck may not affect pregnancy outcome significantly. In others, the nuchal cord may lead to restricted fetal blood flow, oxygen transport, fetal development, fetal movement, and complicated delivery at birth.

Prenatal interventions to correct fetal anomalies or treat FETAL DISEASES in utero. Fetal therapies include several major areas, such as open surgery; FETOSCOPY; pharmacological therapy; INTRAUTERINE TRANSFUSION; STEM CELL TRANSPLANTATION; and GENE THERAPY.

A method of differentiating individuals based on the analysis of qualitative or quantitative biological traits or patterns. This process which has applications in forensics and identity theft prevention includes DNA profiles or DNA fingerprints, hand fingerprints, automated facial recognition, iris scan, hand geometry, retinal scan, vascular patterns, automated voice pattern recognition, and ultrasound of fingers.


Advertisement
 

Relevant Topic

Radiology
Latest News Clinical Trials Research Drugs Reports Corporate
Radiology is the branch of medicine that studies imaging of the body; X-ray (basic, angiography, barium swallows), ultrasound, MRI, CT and PET. These imaging techniques can be used to diagnose, but also to treat a range of conditions, by allowing visuali...

Advertisement