1 Introduction and Historical Overview The first documented use of symphysial fundal height (SFH) measurement was in 1906 by McDonald [1], as a means of determining the length of a pregnancy. Subsequently McDonald [2] described how she calculated the duration of pregnancy in lunar months by dividing the height of the uterus in centimetres by 3.5. She claimed this gave ‘the most exact means of estimation of the duration of pregnancy’. She also claimed that a cut-off SFH is clinically useful.
