What is the normal range of protein in urine during pregnancy?

The normal range of protein in urine during pregnancy is less than 150 milligrams per day. However, some studies suggest that up to 300 milligrams per day can also be considered normal during pregnancy. Higher levels of protein in urine may be a sign of preeclampsia, a serious pregnancy complication that can lead to high blood pressure and damage to organs such as the kidneys and liver. It is important for pregnant women to have their urine protein levels regularly monitored by their healthcare provider.