Overview
Fetal lower urinary tract obstruction (LUTO) is a rare condition that develops before birth, when a blockage forms in the lower part of the baby's urinary tract — the area that includes the bladder, urethra, and nearby structures. This blockage prevents urine from flowing out of the body normally. Because a developing baby's kidneys produce most of the amniotic fluid surrounding them in the womb, a blocked urinary tract can cause the fluid levels to drop dangerously low — a condition called oligohydramnios. Without enough amniotic fluid, the baby's lungs may not develop properly, and the kidneys can become severely damaged. LUTO is also sometimes called bladder outlet obstruction or fetal obstructive uropathy. The most common cause in male fetuses is a condition called posterior urethral valves (PUV), where abnormal tissue flaps block the urethra. Other causes include urethral atresia (a completely closed urethra) and prune belly syndrome. The condition is much more common in male fetuses than female fetuses. Symptoms are detected before birth through ultrasound, which may show an enlarged bladder, swollen kidneys, and low amniotic fluid. Treatment options range from careful monitoring to fetal surgery aimed at relieving the blockage before birth. After birth, babies often need kidney care, bladder management, and sometimes kidney transplantation. Outcomes vary widely depending on how severe the blockage is and how early it is found and treated.
Also known as:
Key symptoms:
Enlarged or very full-looking bladder seen on prenatal ultrasoundSwollen or enlarged kidneys (hydronephrosis) before birthLow amniotic fluid levels around the baby (oligohydramnios)Underdeveloped lungs in the baby (pulmonary hypoplasia)Difficulty urinating or weak urine stream after birthKidney damage or kidney failure in infancy or childhoodRecurrent urinary tract infectionsBladder that does not empty properlyAbdominal swelling or distension in the newbornPoor growth and weight gain in infancyHigh blood pressure related to kidney problemsAbnormal appearance of the abdominal wall (in prune belly syndrome)
Variable
Can be inherited in different ways depending on the underlying gene
Neonatal
Begins at or shortly after birth (first 4 weeks)
FDA & Trial Timeline
3 eventsto lower urinary oxalate levels in children 9 years of age and older and adults with primary hyperoxaluria type 1 (PH1) and relatively preserved kidney function, e.g., eGFR greater than or equal to 30 mL/min/1.73 m2
Mayo Clinic — PHASE1
Rodrigo Ruano — NA
Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.
Treatments
1 availableRivfloza
to lower urinary oxalate levels in children 9 years of age and older and adults with primary hyperoxaluria type 1 (PH1) and relatively preserved kidney function, e.g., eGFR greater than or equal to 30…
to lower urinary oxalate levels in children 9 years of age and older and adults with primary hyperoxaluria type 1 (PH1) and relatively preserved kidney function, e.g., eGFR greater than or equal to 30 mL/min/1.73 m2
Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Financial Resources
2 resourcesREBETOL
Schering Corporation
REBETOL — Contact Schering Corporation
Travel Grants
No travel grants are currently matched to Fetal lower urinary tract obstruction.
Community
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Start the conversation →Latest news about Fetal lower urinary tract obstruction
Disease timeline:
New recruiting trial: Serial Amnioinfusions as Regenerative Therapy for Pulmonary Hypoplasia
A new clinical trial is recruiting patients for Fetal lower urinary tract obstruction
New recruiting trial: Fetal Cystoscopy for Severe Lower Urinary Tract Obstruction
A new clinical trial is recruiting patients for Fetal lower urinary tract obstruction
Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
Rare disease caregiving can be isolating. Connect with counseling and peer support.
Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.How severe is my baby's blockage, and what does that mean for their kidneys and lungs?,Is my baby a candidate for fetal surgery or shunting, and what are the risks and benefits?,What should I expect in the first days and weeks after my baby is born?,How will we monitor my child's kidney function over time, and what signs of worsening should I watch for?,Will my child need to use a catheter, and how will we learn to manage that at home?,What is the likelihood that my child will need dialysis or a kidney transplant, and when might that happen?,Are there any genetic tests I should have done to understand why this happened and whether future pregnancies could be affected?
Common questions about Fetal lower urinary tract obstruction
What is Fetal lower urinary tract obstruction?
Fetal lower urinary tract obstruction (LUTO) is a rare condition that develops before birth, when a blockage forms in the lower part of the baby's urinary tract — the area that includes the bladder, urethra, and nearby structures. This blockage prevents urine from flowing out of the body normally. Because a developing baby's kidneys produce most of the amniotic fluid surrounding them in the womb, a blocked urinary tract can cause the fluid levels to drop dangerously low — a condition called oligohydramnios. Without enough amniotic fluid, the baby's lungs may not develop properly, and the kidne
At what age does Fetal lower urinary tract obstruction typically begin?
Typical onset of Fetal lower urinary tract obstruction is neonatal. Age of onset can vary across affected individuals.
Are there clinical trials for Fetal lower urinary tract obstruction?
Yes — 1 recruiting clinical trial is currently listed for Fetal lower urinary tract obstruction on UniteRare. See the clinical trials section on this page for phase, sponsor, and site details sourced from ClinicalTrials.gov.
Which specialists treat Fetal lower urinary tract obstruction?
10 specialists and care centers treating Fetal lower urinary tract obstruction are listed on UniteRare, sourced from ClinicalTrials.gov principal investigators, published research, and the NPPES NPI registry.
What treatment and support options exist for Fetal lower urinary tract obstruction?
1 patient support program are currently tracked on UniteRare for Fetal lower urinary tract obstruction. See the treatments and support programs sections for copay assistance, eligibility, and contact details.