A web‐based survey of Royal Australian and New Zealand College of Obstetricians and Gynaecologists fellows and trainees enquired about fetal femur length reporting and found:

Heterogeneous (including unpublished) chart choices.
Popular charts are not always of highest quality.
z‐score rarely used despite World Health Authority endorsement.

Potential clinical risks include false‐positive and false‐negative diagnosis and confusion for both patient and staff. We recommend developing high‐quality charts, publishing unpublished charts and describe methods to support best practice.