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

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


During pregnancy, it is common for women to undergo various tests to monitor their health and the health of their baby. One such test is the analysis of protein levels in urine. Protein in urine during pregnancy can be an indication of certain health conditions, and it is important to understand what is considered a normal range. In this article, we will explore the normal range of protein in urine during pregnancy and its significance.

Protein in Urine during Pregnancy

Proteinuria, the presence of excess protein in the urine, can be a cause for concern during pregnancy. Normally, the kidneys filter waste products from the blood, including excess protein, and excrete them in the urine. However, during pregnancy, the kidneys may become more permeable, allowing small amounts of protein to pass through. This is known as physiological proteinuria and is considered normal.

The American College of Obstetricians and Gynecologists (ACOG) states that a protein level of up to 150 mg per day is considered within the normal range during pregnancy. This level is significantly higher than the normal range for non-pregnant individuals, which is usually less than 30 mg per day.

Significance of Protein in Urine during Pregnancy

While some protein in urine is normal during pregnancy, higher levels can indicate potential health issues. Persistent or significant proteinuria may be a sign of conditions such as preeclampsia or gestational hypertension. These conditions can be serious and require medical attention.

Preeclampsia is a pregnancy complication characterized by high blood pressure and damage to organs, such as the liver and kidneys. Proteinuria is one of the key diagnostic criteria for preeclampsia. It is important to note that proteinuria alone does not confirm the presence of preeclampsia, but it is an important factor in the diagnosis.

Monitoring Protein Levels during Pregnancy

To monitor protein levels in urine during pregnancy, healthcare providers may perform a urine dipstick test or a 24-hour urine collection. The urine dipstick test is a simple and quick method that provides an immediate result. It can detect the presence of protein but does not measure the exact amount. If the dipstick test shows positive results for protein, a 24-hour urine collection may be recommended to measure the protein level accurately.

A 24-hour urine collection involves collecting all urine produced over a 24-hour period in a special container provided by the healthcare provider. The collected urine is then sent to a laboratory for analysis. This test provides a more accurate measurement of protein levels and helps healthcare providers assess the severity of proteinuria.


In conclusion, protein in urine during pregnancy is a common occurrence, with up to 150 mg per day considered within the normal range. However, higher levels of protein may indicate underlying health conditions such as preeclampsia or gestational hypertension. Regular monitoring of protein levels through urine dipstick tests or 24-hour urine collections is essential to identify any potential issues and ensure the well-being of both the mother and the baby.


– American College of Obstetricians and Gynecologists. (2021). Preeclampsia and High Blood Pressure During Pregnancy. Retrieved from acog.org
– Mayo Clinic. (2021). Preeclampsia. Retrieved from mayoclinic.org