Measurement of blood pressure and urine protein at regular intervals in the late second and third trimesters is critical for diagnosis of preeclampsia.

The result shows that measurement standard error reaches minimum 0.027 for most milk sample and satisfies the national criterion of protein detection when dilution ratio ranges from 6.2 to 7.4.

To establish a method about uncertainty evaluation of the measurement of protein content in infant milk powder, the effect factors were find.