Accuracy of pregnancy dating carbon dating berrys creek
This is an interesting sidebar that provides some latitude in an otherwise firm stance echoing the RADIUS trial findings.
In spite of this ongoing debate as to the feasibility and efficacy of routine ultrasound evaluation in pregnancy, one thing remains clear: ultrasound examination of the fetus provides the most precise assessment of gestational age, especially in the first trimester.
This time frame allows for fairly accurate dating and the added benefit of a fetal survey, a factor that some authors have found significantly reduces woman's anxiety about the overall health of their baby.
also advises that providers discuss the limitations of ultrasound before obtaining any scans.
Instead, menstrual dating, with all of its potential calculation inconsistencies, recall error, and questionable origins, remains the a priori method for pregnancy dating in the absence of any complications.
has also published specific guidelines that address training, quality assurance, safety, and clinical recommendations.
They further concluded that the costs associated with routine screening were too prohibitive to justify its use in the absence of clear medical indications.
Practicing what is commonly referred to as the "ALARA" principle (As Low As Reasonably Achievable), there have been no studies to date that have reported any adverse bioeffects on human fetuses as a result of exposure to the low levels of ultrasound energy in use today.examined the efficacy of routine ultrasound screening in more than 15,000 low-risk pregnant women.Looking specifically at adverse perinatal outcomes, such as fetal death, neonatal death, or neonatal morbidity, the authors found no clinical benefit to routine ultrasound screening in pregnancy.Cost-benefit ratios of routine ultrasound use have still not been completely resolved in every practice setting, with one study suggesting that community-based hospitals would actually lose money if routine ultrasound screening is performed.
further states that ultrasound sensitivity in detecting fetal anomalies remains controversial, with higher detection rates reported at tertiary centers and higher sensitivity rates overall for central nervous system and urinary tract versus cardiac anomalies.
In midwifery practices especially, where the focus on nonintervention predominates, a single ultrasound performed before 24 weeks' gestation will not only reliably confirm the EDD but, as many of the previously cited studies suggest, may in fact reduce the likelihood of unnecessary interventions.