Having protein in your urine while as a pregnant woman isn’t too unusual, but when the results start to be +1 or +2 your doctor will start to become more concerned, as you enter the third trimester. Let this L&D RN tell you exactly why this happens, why they test your urine sample and why it’s a problem.
First off, hello! I’m Hilary — many people know me as The Pregnancy Nurse 👩⚕️. I have been a nurse since 1997 and I have 20 years of OB nursing experience, I am also the curly head behind this website Pulling Curls and The Online Prenatal Class for Couples. 🩺
I 100% understand that pregnancy is full of SO many questions. There seem to be more and more the further you get. Which is why I love this. It really can prepare you for your confident delivery in just a few hours.
Why would you have protein in your urine while pregnant?
When you’re pregnant, your body has a much larger blood volume than normal. Your kidneys have to sort of “open up” a bit to let all that blood volume through. Want to know more about your kidneys in pregnancy, this is a good concise paragraph.
When they do this, they may let a little protein spill into your urine. Which is OK. When you have more — it starts to become an issue.
Trace protein in your urine during pregnancy
This isn’t unusual and isn’t a symptom of any problems.
Protein in your urine before 20 weeks or so (or, when you’re NOT pregnant) is usually indicative of a urinary tract infection (UTI) or some other issue, not preeclampsia. That is a pretty minor infection and not as problematic.
How do they test for proteinuria during pregnancy?
It can be done a few ways:
- Regular urine checks at your prenatal appointments (they check for a few other things as well — that’s why you have to pee in a cup at each appointment) — this is done quickly at the doctor’s office as a routine test.
- Another urine test that has to be sent to the lab called a protein creatinine clearance/ratio
- They can also send you home to collect your urine for 24 hours for a 24-hour protein test (you also have to keep it cold, so this is a pain). BTW, if you’re wondering about testing that happens in your 3rd trimester, this free course explains a lot.
- Women often will say their urine looks “frothy” if they are losing protein, so something else to keep an eye on.
Around your 20th week of pregnancy, your healthcare provider will start to be more alert to your blood pressure, and any protein in your urine.
While the 24-hour urine protein test has been the “gold standard” for a number of years, they seem to be finding that the protein creatinine ratio test is just about as good and MUCH more convenient (and fast) vs a 24-hour urine.
With the 24-hour urine collection you most often have to stay at home most of the day as you have to collect all your urine and keep it cold (usually either in your fridge or on ice at home). That makes it hard to leave much longer than an hour, and most women can’t go to work during the testing period.
**In the Call the Midwife book, they put women’s urine on the heater to see if the protein would congeal — a pretty cool old school method, like cooking eggs!
Why is protein in my urine a problem during pregnancy?
I want to be clear that it’s not the actual PROTEIN that’s a problem. It’s what’s happening in your kidneys as a result of possible preeclampsia that’s the problem. If we let it continue long term you could get serious kidney damage or chronic kidney disease. They can check your kidneys by running a BUN or a serum creatinine.
Preeclampsia (or hellp syndrome) makes your blood vessels leak even more than usual. That’s why you would get swelling (again, SOME swelling isn’t unusual — it’s an excessive amount) and also your kidneys leak fluid and don’t filter your urine as well as it did before you became pregnant/had preeclampsia. About 15% of women in the united states get PIH or preeclampisa (also called HELLP syndrome). But, most women do NOT have this issue — and have a totally normal pregnancy.
Signs of Preeclampsia include:
- Swelling (although most often it’s nothing — sudden facial swelling is a bigger “sign”)
- Vision issues (where things go fuzzy)
How to reduce protein in urine during pregnancy?
There really isn’t a way to get rid of protein in your urine durig pregnancy, as it is caused by something entirely not your fault. Preeclampsia starts the minute your fetus implants in the womb, and while you don’t see symptoms until later in your pregnancy, it is due to something that science isn’t quite sure of yet (that post I linked to has a TON of information on preeclampsia, I highly recommend it).
AND, just because you have preeclampsia during this pregnancy, doesn’t mean you’ll have it next pregnancy. The best thing you can do is try to live as healthy a lifestyle as you can.
Higher risk factors or for preeclampsia include:
- Multiple gestations (twins or more)
- Being over 35 at the time of conception (advanced maternal age)
- Previous issues with high blood pressure (hypertension)
- Previous kidney disease
- Gestation or other types of diabetes
You’ll notice it doesn’t really matter if it’s your third or your first pregnancy (beyond the fact that you get older the more babies you have). Protein in your urine can show up at any time.
So, by losing weight, lowering your risk of diabetes, and watching other health conditions — you can help prevent it — but not all women with preeclampsia have any of those high risk factors — we just know that they’re more likely to have it with those.
+1 Protein in Urine During Pregnancy
This is when your healthcare provider may start to get concerned — that is too much protein in you urine. They may double check your blood pressure, or refer you for more labs. They may also watch you until your next appointment if you don’t have other signs and symptoms of preeclampsia.
This is NOT a definitive test for preeclampsia, there are other factors they consider.
On the scale of the amount of protein it goes:
- Trace (being just a tiny bit — and each # increases)
- +4 (this one would cause your doctor to be very concerned and you would likely head to the hospital for more testing — it shows high levels of protein)
These numbers are associated with a quick urine dipstick — the other tests (the ratio and the 24-hour urine have different numbers)
Keep in mind there are a lot of other reasons they test your urine, including gestational diabetes (but that’s a different test on the urine dipstick). They also test for white blood cells — which could show a kidney infection. Or red blood cells which could show kidney stones or an infection.
What is a high level of protein?
4+ protein in the urine is as high as a urine dipstick testing goes — they see that in a lot of severe cases of preeclampsia. They have more definitive numbers in the 24-hour urine or the ratio test I mentioned above, and as a pregnant woman, you may end up taking that as well.
Treatment for protein in the urine/Preeclampsia Treatments
Hopefully, I’ve made it clear that it’s not the PROTEIN we’re treating, but preeclampsia. You can learn more about preeclampsia here.
Preeclampsia is a serious condition, so it’s an a big reason reason why prenatal checks are so important.
Keep in mind that high blood pressure ALONE would be just be more of a chronic hypertension (it also could just be around during pregnancy — which is called gestational hypertension) — so that would be treated DIFFERENT than preeclampsia. The protein creatinine ratio is really important in determining that.
If you are diagnosed with preeclampsia you may be induced early and have an early delivery — but all of that will be decided under a team of healthcare professionals, who most often consult a perinatologist (a high risk pregnancy doctor).
FAQ’s about Protein in Urine
Does protein in urine always mean preeclampsia?
Not always, but it is probably the most-often test used for diagnosis.
Is Protien in urine dangerous?
Nope, it’s what is CAUSING the protein in the urine that is dangerous (preeclampsia).
What is the first sign of preeclampsia?
Since doctors check your urine at checkups. Often trace protein in the urine is the first sign. But, severe headaches are often the first sign as well.
Keep in mind, it’s not unusual to have headaches during pregnancy — but a preeclampsia headache sticks around, even with Tylenol or water.
Tests need to be done with accurate results to give you a diagnosis of preeclampsia.
How does preeclampsia affect baby?
It can restrict blood flow to the baby (even if you have higher blood pressure, less is getting through the placenta) but mostly the problem is due to MOM’S health so that she doesn’t seize, etc.
Ultimately, if there is so much pulsating blood flow (shown by the high blood pressure) you could be at risk for a placental abruption where the placenta starts to peel from the uterine wall — a serious complication. Also, because your heart is working so hard with all of this it can cause heart disease, or pulmonary edema.
Do not miss my whole other post about preeclampsia that will give more info on the treatments and more symptoms to keep an eye out for.