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Why do I have to pee in a cup again?
Pregnancy

Why do I have to pee in a cup again?

2 min readWeek 26
Key takeaways
2 min
  • Expect regular urine tests during pregnancy visits, especially after 20 weeks, to screen for infections and preeclampsia.
  • Understand that up to 15% of pregnant women test positive for urinary tract infections that need treatment to prevent complications.
  • Monitor for protein in urine after 20 weeks, as it can indicate preeclampsia or kidney disease requiring immediate medical attention.
  • Schedule additional visits if protein is found in your urine, even with normal blood pressure, to rule out kidney problems.
  • Recognize that early detection of kidney issues prevents dangerous complications like intrauterine infection and preeclampsia.

Pregnancy urine tests are required at every prenatal visit to screen for urinary tract infections (affecting 15% of pregnant women) and detect protein levels that indicate preeclampsia, especially after 20 weeks when this dangerous condition typically develops.

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In the second half of pregnancy, you may feel that your medical team is playing a prank on you. Every time you go to your prenatal visit, you are asked to pee in a cup. Again and again. 

What are they looking for anyway?

Up to 15% of pregnant women will test positive for asymptomatic bacteriuria, or infections of the urinary tract [1]. If left untreated, pyelonephritis (inflammation of the kidneys) may develop, which, in turn, may lead to complications in the pregnancy and premature birth [1].

In addition, a general urine test is done at least once every trimester to monitor protein levels in your urine and discard the possibility of preeclampsia [2].

The condition known as preeclampsia most often begins to develop after the 20th week, and its main signs are high blood pressure and protein in the urine. Therefore, after the 20th week, you will likely get a urine test.

What if they find protein in my urine?

High protein content in your urine is enough to consider your pregnancy high risk, and your doctor will know to monitor for signs of preeclampsia. 

If there is protein in your urine and you have high blood pressure, then your doctor will diagnose you with preeclampsia, and you will need to schedule additional visits to monitor and control the condition.  

If your blood pressure is normal, but the protein in your urine has increased, it may indicate kidney disease, which is not necessarily associated with preeclampsia [3]. In that case, your doctor may refer you to a nephrologist (kidney specialist).

Should I be concerned about kidney disease even if there are no signs of preeclampsia?

Yes, kidney disease is something your doctor will want to monitor. Gestational pyelonephritis (inflammation of the kidneys) can trigger the development of preeclampsia. However, the most dangerous complication is intrauterine infection. The sooner a kidney problem is identified, the better it can be treated by your doctor. 

Frequently asked questions

Pregnancy urine tests check for urinary tract infections and protein levels that could indicate preeclampsia. Regular testing helps detect these conditions early to prevent serious complications for you and your baby.

Protein in urine during pregnancy can indicate preeclampsia or kidney disease. If found with high blood pressure, it confirms preeclampsia diagnosis requiring close monitoring and additional prenatal visits.

Pregnancy urine tests for preeclampsia typically begin after 20 weeks of pregnancy. This is when preeclampsia most commonly develops, making regular protein monitoring crucial for maternal and fetal health.

Yes, pregnancy urine tests are essential even when you feel fine because many conditions like urinary tract infections are asymptomatic. Up to 15% of pregnant women have infections without symptoms that need treatment.

If your pregnancy urine test shows infection, your doctor will prescribe safe antibiotics for treatment. Untreated urinary tract infections can lead to kidney inflammation and potentially cause premature birth.

Medical Disclaimer

This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or qualified health provider with any questions you may have regarding a medical condition.

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Medically reviewed content

Reviewed by healthcare professionals · Updated March 25, 2025

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