Leukocytes (WBCs) in Urine During Pregnancy: Causes, Symptoms and Treatment (2026 Guide)

TL;DR

Leukocytes (white blood cells) in your urine during pregnancy usually mean there may be an infection or inflammation in your urinary tract, most often a urinary tract infection (UTI). UTIs are more common in pregnancy because of hormonal and physical changes (NHS) (ACOG)。 This matters because in pregnancy, even a UTI with no symptoms (asymptomatic bacteriuria) is treated, since untreated it can spread to the kidneys and is linked to preterm birth. The good news: when found early and treated with pregnancy-safe antibiotics prescribed by your doctor, outcomes are very good. Never self-medicate. See your doctor if you have burning urination, frequent urge, cloudy or smelly urine, fever, chills or back pain. Routine urine tests in pregnancy exist precisely to catch this early.

Quick Answer

Leukocytes (white blood cells) in urine during pregnancy usually point to a possible infection or inflammation in the urinary tract, most often a UTI. UTIs are more common in pregnancy. This matters because even a symptom-free UTI is treated in pregnancy, since untreated it can reach the kidneys and is linked to preterm birth. Treated early with doctor-prescribed, pregnancy-safe antibiotics, outcomes are good. Never self-medicate. See your doctor for burning urination, fever, or back pain.

Author: Anupama Chadha, Senior Health Content Editor, Mylo Parenting Desk Medically reviewed by: Dr. Shruti Tanwar, MBBS, MS (Obstetrics & Gynecology), aligned with NHS, ACOG and FOGSI guidance Last updated: 11 June 2026

Medical Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice. Leukocytes in urine need evaluation by your doctor with a urine test and culture. Do not take any antibiotic without a prescription. If you have a fever, chills, back pain, vomiting, or feel very unwell, seek medical care promptly.

Key Takeaways

• Leukocytes (WBCs) in urine usually signal a possible urinary tract infection or inflammation (NHS)
• UTIs are more common in pregnancy (hormonal and physical changes)
• Even a symptom-free UTI (asymptomatic bacteriuria) is treated in pregnancy (ACOG)
• Untreated, it can reach the kidneys and is linked to preterm birth
• Diagnosis is by urine test (urinalysis) and urine culture
• Treatment is pregnancy-safe antibiotics, prescribed by your doctor
• Never self-medicate; complete the full course prescribed
• Red flags: fever, chills, back/flank pain, vomiting, seek care promptly

What Does It Mean to Have Leukocytes in Your Urine?

Leukocytes are white blood cells (WBCs), part of your immune system. Normally only a few are present in urine. When a urine test (urinalysis) shows raised leukocytes, it usually means your body is responding to a possible infection or inflammation in the urinary tract (MedlinePlus)。

A note on tests: Leukocytes in urine (a urine test) are different from your WBC count in blood (a blood test). A mildly raised WBC in blood can be normal in pregnancy, but leukocytes in urine specifically suggest a urinary issue that should be checked.

Why Are UTIs and Leukocytes in Urine More Common in Pregnancy?

Pregnancy makes UTIs more likely because of several changes (ACOG) (Cleveland Clinic):

This is why routine urine tests are part of antenatal care, to catch infection early, often before you even feel symptoms.

What Are the Causes of Leukocytes in Urine?

The most common cause is a urinary tract infection, but there are others (NHS) (MedlinePlus):

Because a contaminated sample can also raise leukocytes, your doctor may repeat the test with a clean-catch midstream sample and a urine culture to confirm a true infection.

What Are the Symptoms of a UTI in Pregnancy?

A UTI may cause (NHS):

• Burning or pain when passing urine
• Frequent urge to urinate (more than the usual pregnancy frequency)
• Cloudy, smelly or bloody urine
• Lower abdominal discomfort or pressure
• Feeling that the bladder is not fully empty

Important: Many pregnant women have no symptoms at all (asymptomatic bacteriuria). This is exactly why routine urine testing matters, it finds and treats infection you cannot feel.

When Is It Serious? (Kidney Infection Warning Signs)

If a UTI spreads to the kidneys (pyelonephritis), it is more serious and needs urgent care (ACOG):

Seek medical care promptly if you have:

• Fever and chills
• Pain in your back or side (flank)
• Nausea and vomiting
• Feeling very unwell
• Any UTI symptoms that are worsening

Kidney infection in pregnancy needs prompt treatment, so do not wait if you have these red flags.

Why Treating It Matters in Pregnancy

In pregnancy, even a symptom-free UTI is treated, and there is a clear reason (ACOG) (NCBI/StatPearls):

• Untreated bacteriuria can progress to a kidney infection
• Untreated UTIs are linked to preterm birth and low birth weight
• Early treatment prevents these complications

This is reassuring, not alarming: the whole point of routine testing and early antibiotics is to prevent problems. Treated promptly, the vast majority of cases resolve without harm to mother or baby.

How Is It Diagnosed and Treated?

Diagnosis (Cleveland Clinic)

1. Urinalysis (dipstick and microscopy for leukocytes and bacteria)
2. Urine culture (identifies the bacteria and the right antibiotic)
3. A clean-catch midstream sample to avoid contamination

Treatment

• Pregnancy-safe antibiotics, prescribed by your doctor, based on the culture
• Complete the full course, even if you feel better
• A follow-up urine test may be done to confirm it has cleared
• Plenty of fluids alongside treatment

Never take antibiotics on your own. Only your doctor can choose a safe, effective antibiotic for pregnancy and the specific bacteria.

How Can You Help Prevent UTIs in Pregnancy?

Simple steps lower your risk (NHS) (ACOG):

1. Drink plenty of water
2. Do not hold urine; empty your bladder regularly
3. Urinate after sex
4. Wipe front to back
5. Wear cotton underwear; avoid tight synthetic fabrics
6. Avoid douching and scented intimate products
7. Attend all antenatal visits and urine tests

Indian Context: What Indian Mothers Should Know

1. Routine urine tests matter: Antenatal urine testing catches infection early, do not skip it (FOGSI)
2. No self-medication: Do not take leftover or pharmacy antibiotics; only a doctor's prescription is safe in pregnancy
3. Stay hydrated: Especially in hot weather, drink enough water
4. Hygiene: Front-to-back wiping and urinating after sex help prevent UTIs
5. Complete the course: Stopping antibiotics early can cause the infection to return or resist treatment
6. Government care: Antenatal checkups under schemes like PMSMA include urine testing

Myths vs Facts About Leukocytes in Urine

FAQs: Leukocytes in Urine During Pregnancy

What does it mean to have leukocytes in urine during pregnancy?

It usually means there may be an infection or inflammation in your urinary tract, most often a UTI (MedlinePlus)。 Your doctor will confirm with a urine culture. UTIs are common in pregnancy and very treatable, but they should not be ignored.

Pregnancy mein urine mein leukocytes aane ka matlab kya hai? (Hinglish)

Iska matlab aksar yeh hota hai ki urinary tract mein koi infection ya inflammation ho sakta hai, jaise UTI. Pregnancy mein UTI common hai. Ghabrayein nahi, lekin ise ignore bhi na karein. Doctor urine test aur culture karke confirm karenge aur pregnancy-safe antibiotic denge. Khud se koi antibiotic na lein.

Is a UTI in pregnancy dangerous?

It is treatable, and treatment prevents problems (ACOG)。 Untreated, a UTI can spread to the kidneys and is linked to preterm birth, which is why doctors treat even symptom-free infections. Caught early and treated, outcomes are very good.

Do I need treatment if I have leukocytes but no symptoms?

Yes, in pregnancy. Even asymptomatic bacteriuria (infection without symptoms) is treated in pregnancy to prevent it reaching the kidneys or causing preterm birth (NCBI/StatPearls)。 Your doctor will confirm with a culture and prescribe a safe antibiotic.

Bina symptom ke bhi UTI ka ilaaj zaroori hai kya? (Hinglish)

Haan, pregnancy mein bina symptom wale UTI (asymptomatic bacteriuria) ka bhi ilaaj zaroori hai, taaki infection kidney tak na pahunche ya preterm birth ka khatra na bane. Doctor urine culture karke pregnancy-safe antibiotic denge. Poora course complete karein, beech mein na chhodein.

How is it treated in pregnancy?

With pregnancy-safe antibiotics prescribed by your doctor, based on a urine culture (Cleveland Clinic)。 Complete the full course, drink plenty of fluids, and your doctor may repeat the urine test to confirm it has cleared. Never take antibiotics on your own.

When should I worry and see a doctor urgently?

Seek care promptly if you have fever, chills, back or side pain, nausea or vomiting, these can signal a kidney infection (ACOG)。 Also see your doctor for any burning urination, frequent urge, or cloudy/smelly urine.

Can leukocytes in urine be a false result?

Sometimes, yes. A contaminated sample (for example, from vaginal discharge) can raise leukocytes (MedlinePlus)。 That is why your doctor may repeat the test with a clean-catch midstream sample and a urine culture to confirm a true infection before treating.

References

1. NHS UK. "Urinary Tract Infections (UTIs)." https://www.nhs.uk/conditions/urinary-tract-infections-utis/
2. ACOG. "Urinary Tract Infections." https://www.acog.org/womens-health/faqs/urinary-tract-infections
3. Cleveland Clinic. "Urinary Tract Infections." https://my.clevelandclinic.org/health/diseases/9135-urinary-tract-infections
4. MedlinePlus. "White Blood Cells (WBC) in Urine." https://medlineplus.gov/lab-tests/white-blood-cells-wbc-in-urine/
5. NCBI / StatPearls. "Asymptomatic Bacteriuria." https://www.ncbi.nlm.nih.gov/books/NBK470216/
6. FOGSI (Federation of Obstetric and Gynaecological Societies of India). https://www.fogsi.org/