Butterfly now offers a dedicated measurement package containing obstetric calculations to determine EFW, EDD, and AFI.
Butterfly iQ now provides an easy-to-use interface for collecting and processing multi-image fetal biometry to generate estimated date of delivery (EDD), estimated fetal weight (EFW) after 12 weeks gestation and amniotic fluid index (AFI).
EDD is an important metric for planning obstetrical care. While EDD can be estimated from the last menstrual period (LMP), ultrasound provides a standardized way for these estimates to be calculated, particularly, in cases of IVF or when the LMP is unknown.
The standard four-biometric values are:
While a single measurement can provide an EDD, it gets more accurate as more measurements are made. In order to generate the fetal health parameters, the standard Hadlock table is used.
The amniotic fluid index (AFI) is a quantitative estimate of amniotic fluid and an indicator of fetal health. The AFI is a score (expressed in cm) attributed to the amount of amniotic fluid visualized. Guidelines for minimum and maximum values exist to support a diagnosis of polyhydramnios or oligohydramnios in a growing fetus. AFI is a standard part of a fetal biophysical profile obstetric exam.
Open the Butterfly iQ app, and select the Obstetric preset. Select Fetal Biometrics (or Amniotic Fluid Index) under the Actions menu.
Scan in real-time and Freeze the image featuring the biometric value (BPD, HC, AC or FL) you wish to record. Choose the corresponding label, and place calipers.
Follow the steps above to add additional measurements. The accuracy of the measurement will update with every new biometric that is added.
Access your report by selecting AUA. See the measurements and resultant calculation of EDD and EFW.
Measurements may be acquired in any order.
No. As more measurements are added, the EDD calculation becomes more accurate. However, a single measurement can produce the EDD.
As you adjust the measurement calipers on a frozen image, the values for EDD/GA update in real-time. This allows for immediate biometric feedback.
BPD (Biparietal diameter), HC (Head circumference), AC (Abdominal circumference), FL (Femur length).
GA (gestational age), EDD (estimated date of delivery), EFW (estimated fetal weight).
For calculations, the NICHD and Hadlock tables are used.
Butterfly has opted for a one measurement technique in response to customer requests, in accordance with industry guidelines, such as those released by BMUS.
First trimester measurements are in active development. The initial offering includes OB calculations that are best suited for transabdominal imaging. Stay tuned for more updates.