How to interpret an EFW percentile
An EFW percentile shows the relative position of an entered value within the selected reference at the same gestational age. It is not a diagnosis or a normal-abnormal judgment.
Use the calculatorWhat a percentile means
A percentile describes where the entered value sits within the selected reference. It is not a normal or abnormal judgment, and it should not replace clinical review.
Selected data stays separate
WHO, INTERGROWTH-21st, Korean, Japanese, and NICHD datasets are not mixed or combined. The calculator uses the percentile values from the selected reference only.
Which reference should I choose?
Use the reference your clinician or ultrasound report expects when one is specified. If you compare another source, read it as a separate reference shown as selected.
Is this a medical diagnosis?
No. The result is a reference percentile only. It does not diagnose growth restriction, macrosomia, placental function, or future outcome.