Fetal biometry: Relevance in obstetrical practice

Currently there is no satisfactory system of morphological staging of the fetal period of development, and the terminology used to describe this time period reflects this confusion. However, they are widely used colloquially within obstetric practice. Staging of fetal development and growth is based on an estimate of the duration of a pregnancy. Whereas development of a human from fertilization to full term averages days, or 9. If a fetal ageing system is used, it must be remembered that the age of the fetus may be 2 weeks more than a comparable fetus that has been aged from postovulatory days. Embryonic development, in the upper scale, is counted from fertilization or from ovulation, i. Throughout this book, times given for development are based on this scale.

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Transcription 1 Fetal size and dating: The application of the recommended charts in clinical practice has not been addressed as dating policies and the identification of growth related problems should form part of locally derived protocols. General guidance Dating measurements are used to confirm the postmenstrual dates if known or to estimate the gestational age GA of the fetus when the menstrual history is unknown or unreliable.

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This is an open access article distributed under the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract Clear guidance on fetal growth assessment is important because of the strong links between growth restriction or macrosomia and adverse perinatal outcome in order to reduce associated morbidity and mortality.

Fetal growth curves are extensively adopted to track fetal sizes from the early phases of pregnancy up to delivery. In the literature, a large variety of reference charts are reported but they are mostly up to five decades old. Furthermore, they do not address several variables and factors e. Therefore, currently adopted fetal growth charts are inadequate to support the melting pot of ethnic groups and lifestyles of our society. Customized fetal growth charts are needed to provide an accurate fetal assessment and to avoid unnecessary obstetric interventions at the time of delivery.

Starting from the development of a growth chart purposely built for a specific population, in the paper, authors quantify and analyse the impact of the adoption of wrong growth charts on fetal diagnoses. These results come from a preliminary evaluation of a new open service developed to produce personalized growth charts for specific ethnicity, lifestyle, and other parameters.

Dewhurst’s Textbook of Obstetrics & Gynaecology, 9th Edition

To ultrasound or not to ultrasound? That is the question. For most pregnant mamas, ultrasounds are just a given. As a natural mama, we want to avoid as many interventions as possible during pregnancy and birth.

Vaginal or ‘transvaginal’ ultrasound Abdominal or ‘transabdominal’ ultrasound.

These new guidelines will become the new rules by which obstetricians administer prenatal testing. In the nine years since those guidelines were first published, cell free DNA screening has entered clinical practice. Prenatal Diagnostic Testing for Genetic Disorders The first new guideline in numerical order concerns the relatively finite options of diagnostic testing. Here are the other main takeaways from Practice Bulletin No. Its calculated procedure-related loss rate is 0.

While earlier studies had suggested an association with limb-reduction defects, the risk is not significantly greater than found in the general population provided CVS is performed at or after 10 weeks of gestation. The estimated procedure-related loss rate is approximately 0. Any clinical decision should not be based solely on FISH, but after confirmatory diagnostic results or consistent clinical information, e.

General information about the potentially detectable conditions should be provided patients before making a decision to have invasive diagnostic testing. Screening for Fetal Aneuploidy Unlike diagnostic testing, there are a panoply of screening methodologies and combinations thereof.

Standards for Due Date Estimation Issued by ACOG, SMFM, AIUM

References “The technology of prenatal diagnosis is usually presented to us as a solution, but it brings with it problems of its own If you’ve already read it, you may want to skip ahead. All pregnant women in our technology-happy modern society face confusing choices about prenatal testing, its advantages and disadvantages, and its appropriateness for them.

See Table 5 Table 5:

An International Journal of Obstetrics and Gynaecology https: Accurate fetal brain volume estimation is of paramount importance in evaluating fetal development. The aim of this study was to develop an automatic method for fetal brain segmentation from magnetic resonance imaging MRI data, and to create for the first time a normal volumetric growth chart based on a large cohort. A semi-automatic segmentation method based on Seeded Region Growing algorithm was developed and applied to MRI data of typically developed fetuses between 18 and 37 weeks’ gestation Fetal Diagnosis and Therapy https: Neonatal iron deficiency is associated with low birth weight, delayed growth and development, and increased cognitive and behavioral abnormalities.

Intravenous iron formulations allowing replacement in one visit with favorable side-effect profiles decrease rates of anemia with improved hemoglobin responses and maternal fetal outcomes.

Estimation of Fetal Weight

Practical Obstetrical Ultrasound, p Rockville, MD, Aspen, Averaging the gestational ages derived from two or more measurements has been shown to be more accurate than using any single parameter. Because of the greater accuracy of the early study, ultrasound examinations subsequent to an early study should not be used to revise the estimated date of confinement EDC , but rather should be used as a measure of the quality of fetal growth between the two studies. Similarly, it is not appropriate to revise an EDC on the basis of an ultrasound examination if the patient’s menstrual dates are within the range of error of the ultrasound method.

If significant discrepancy is seen between two ultrasonographically measured fetal dimensions more than a 2-week difference , then the ultrasonographer must consider the possibility of an error in measurement technique.

American Journal of Medicine https:

The network uses the national Infomed backbone to provide real-time connection between community-based polyclinics in primary health care and the Provincial Medical Genetics Reference Center. The platform has records for 23, pregnant women and sequential clinical data on genetic risk assessment in early pregnancy, first trimester ultrasound, sickle cell anemia screening, alpha-fetoprotein levels, cytogenetic antenatal diagnosis, second trimester ultrasound, delivery and newborn characteristics, neonatal metabolic screening, and infant clinical assessment.

The system makes health care results immediately available and provides health alerts to enable timely preventive care for pregnant women. It also provides guidelines for processes and practices, and streamlines administrative and monitoring activities through statistical reports. The database generates indicators for assessing fetal growth and applies international standards for antenatal ultrasound quality control.

Salgen provides a new source of information for medical research and knowledge management, and its use in this case fulfills Cuba’s criteria for an integrated health services network. Since , the Psychosocial, Psychopedagogical and Clinical Genetics Study of Persons with Disabilities in Cuba[2] has been instrumental in extending the scope of medical genetics through gradual development of primary health care PHC services, by providing genetic counselors and promoting development of provincial and national referral services for patients diagnosed in PHC facilities, as well as those at risk needing assessment or treatment at other levels.

The organizational structure and service relationships between the different health care levels constitutes the National Medical Genetics Network. Health services are grounded in primary care-consisting of 23 community-based polyclinics and neighborhood family doctor-and-nurse offices-complemented by municipal and provincial hospitals. All polyclinics offer community genetics services, and a provincial facility, the Provincial Medical Genetics Reference Center CPGM, the Spanish acronym , is equipped to provide clinical genetics services and antenatal diagnosis using ultrasound and cytogenetic, biochemical and molecular studies.

Since , first- and second-trimester ultrasound screening services have been gradually decentralized from CPGM to municipalities, as training was completed for health professionals to update them on current national programs and the Fetal Medicine Foundation guidelines. Through the program, patients at increased risk were identified and referred to the provincial facility for assessment.

Antepartum Fetal Surveillance

This is an open access article distributed under the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Operative vaginal deliveries OVD are vaginal deliveries accomplished with the use of a vacuum device or forceps.

If it is technically feasible and can be safely accomplished, termination of second stage labor by operative vaginal delivery is indicated in any condition threatening the mother or fetus that is likely to be relieved by delivery.

Moreover, the pattern of its expression in certain tissues e.

The World Health Organization recommends that human growth should be monitored with the use of international standards. However, in obstetric practice, we continue to monitor fetal growth using numerous local charts or equations that are based on different populations for each body structure. All these standards are based on the same healthy pregnancy cohort.

Clinical care, feeding practices, anthropometric measures, and assessment of morbidity were standardized across study sites and documented at 1 and 2 years of age. Weight, length, and head circumference age- and sex-specific z-scores and percentiles and motor development milestones were estimated with the use of the World Health Organization Child Growth Standards and World Health Organization milestone distributions, respectively. For the preterm infants, corrected age was used. Variance components analysis was used to estimate the percentage variability among individuals within a study site compared with that among study sites.

There were no substantive differences between the included group and the lost-to-follow up group. Infant mortality rate was 3 per ; neonatal mortality rate was 1. The cohort overlapped between the 3rd and 97th percentiles of the World Health Organization motor development milestones. We estimated that the variance among study sites explains only 5.

Papers with the keyword fetal growth charts (Page 2)

Multiple gestation with significant growth discrepancy Oligohydramnios Post-term pregnancy greater than 41 weeks gestation Pregnancy-induced hypertension Previous fetal demise unexplained or recurrent risk Fetal Movement Assessment A decrease in the maternal perception of fetal movement often but not invariably precedes fetal death, in some cases by several days. This observation provides the rationale for fetal movement assessment by the mother “kick counts” as a means of antepartum fetal surveillance.

In a review on fetal movement assessment, Froen and colleagues noted that while almost all pregnant women adhere to it, organized screening by fetal movements has seen variable popularity among health professionals. Early results of screening were promising and fetal movement counting is the only antepartum testing method that has shown effect in reducing mortality in a randomized controlled trial comparing testing versus no testing. Although awareness of fetal movements is associated with improved perinatal outcomes, the quest to define a quantitative “alarm limit” to define decreased fetal movements has so far been unsuccessful, and the use of most such limits developed for fetal movement counting should be discouraged.

Non-Stress Test The NST is based on the premise that the heart rate of a fetus that is not acidotic or neurologically depressed will temporarily accelerate with fetal movement.

Ask yourself if a definitive answer is important to you and whether it would change management of your pregnancy at all.

The ranges reported reflect the differences among studies in the patient populations under investigation and differences in the criteria used for the diagnosis of each complication. Several studies subdivide such results into those that apply to women of different race, male versus female fetuses, and primiparous versus multiparous gravidas. Standard fetal growth curves are useful for estimating the range of expected fetal weight at any particular gestational age.

However, in order for the growth curves to be useful, all such tables presuppose that the gestational age of the fetus is established properly. Without adequate gestational dating, the standard fetal growth curves cannot be interpreted successfully. The principle limitations of standard fetal growth curves that are derived from population-based studies are as follows: They apply only to fetuses that are of normal size for gestational age and not to those with significant and potentially pathologic growth abnormalities.

The standard deviation SD associated with the mean birth weight estimate at any particular gestational age is wide, typically exceeding grams. The fetus’s gestational age must be known with a high degree of certainty to use the growth curves with any degree of reliability. In general, these growth curves can expect to apply to large populations of pregnant women who have well-dated pregnancies, but the limits of their predictive accuracy make them less than ideal tools for estimating fetal weight for individual patients.

In addition, the fetal growth curves are the most inaccurate at the extremes of fetal weight deviation ie, women carrying fetuses that are either growth restricted or macrosomic. Deviations in fetal weight The diagnosis of deviations in fetal weight presupposes that the reference range for fetal weight at each gestational age is established.

Before a reference range for human birth weight can be established properly, the gestational age at which human births occur must first be defined.


Normally the earliest technically satisfactory measurement will be the most accurate for dating purposes. Once the gestational age has been assigned, later measurements should be used to assess fetal size and should not normally be used to reassign gestational age. For dating charts the known variable [crown-rump length CRL or head circumference HC ] is plotted along the horizontal X axis, and the unknown variable gestational age GA on the vertical Y axis.

Multivariable logistic regression was used to control the effect of confounding variables and to identify factors affecting the fetomaternal outcome.

Noting that accurate dating is a research and public health imperative, researchers from the Committee on Obstetric Practice evaluated methods for improving accurate dating of pregnancy in an effort to promote consistency and accuracy among medical professionals when assigning due dates. The committee noted that the gestational due date should be determined as soon as data from the last menstrual period, the first accurate ultrasound examination, or both are obtained.

The due date should be discussed with the patient and recorded in the medical record. Subsequent changes to the due date should be reserved for rare circumstances and should be discussed with the patient and recorded, the researchers wrote. Gestational age at delivery, based on the methods outlined for estimating the due date, represents the best obstetric estimate for the purpose of clinical care and should be noted on the birth certificate. The best obstetric estimate, rather than estimates based on last menstrual period alone should be used as a measure of gestational age for purposes of surveillance and research.

In a organizational news release, James D. Goldberg, MD, vice chair of the College’s Committee on Obstetric Practice, which developed the Committee Opinion, stressed the importance of consistency between institutions that provide obstetric care.


It has also changed significantly over time. Most of this extra food energy came from an increase in carbohydrate consumption rather than fat consumption. In the United States, subsidization of corn, soy, wheat, and rice through the U. Obese people consistently under-report their food consumption as compared to people of normal weight.

Ask for a transvaginal if they start to push too hard, or ask your OB to send you to a perinatologist for a better scan.

To review the management and outcome of pregnancies of women presenting to obstetrical triage with decreased fetal movements DFM. A retrospective review of women presenting with DFMs to two large Canadian obstetrical centres with a combined deliveries per year. The charts were reviewed for compliance with the Canadian guidelines for demographics age, parity, GA, comorbidities, etc. Journal of Obstetrics and Gynaecology Canada: An area of controversy is whether a single growth reference is representative of growth, regardless of ethnic or country origin American Journal of Obstetrics and Gynecology https: This study sought to estimate the association of adverse perinatal outcomes with pregnancies complicated by fetal echogenic bowel.