Assessment of gestational maturity using a new fundal height measuring tape.

From a series of women with known conception dates, the 50th percentiles of their weekly fundal height measurements were used to calibrate a measuring tape. As a method of gestational assessment, the tape was found to be accurate to within two weeks of the exact dates in 79% of this control group, compared with 96% and 84% respectively using conventional crown rump length and biparietal diameter ultrasound techniques on these same patients.