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Chapter 5 Measurements and Calculations
History
Tap History on the touch screen. The past and present measurement values of the fetus are displayed in
table format. You can change the Pctl. Criteria.
[Figure 5.36 History]
Tips!
Standard Deviation & Percentile
Among OB information, the Growth Table and the typical fetal distribution for the same number of
weeks are used to determine the following information:
X
The normal distribution curve.
X
The measurements for an actual fetus or a position in EFW distribution.
X
Whether a distribution point is within the normal range.
The reference number of weeks for the Growth Table can be set to LMP, Estab. DD or Average US GA
under [Pctl.Criteria]. The typical setting is LMP.
When LMP is not known or uncertain, or when the difference between LMP and Average US GA
is substantial, care must be taken, as selecting different [Pctl.Criteria] can result in a significant
difference.
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