Alport Syndrome in Children
Medically reviewed by Dr. Michael Okonkwo, MD, FAAP · Board-Certified Neonatologist
Content reviewed against published NIDDK, ASN, AAP guidelines
Last reviewed:
If your baby has been diagnosed with or you suspect alport syndrome in children, here is what the evidence says.
The short answer
Alport syndrome is a genetic condition that affects the kidneys, hearing, and eyes due to mutations in genes (COL4A3, COL4A4, or COL4A5) that produce type IV collagen in basement membranes. Children typically have microscopic blood in the urine from early childhood, with progressive hearing loss developing over time. The X-linked form is most common and more severe in males, who may progress to kidney failure in their teens to thirties. Early treatment with ACE inhibitors can significantly delay kidney disease progression.
Key takeaways
- Alport syndrome is a genetic condition that affects the kidneys, hearing, and eyes due to mutations in genes (COL4A3, COL4A4, or COL4A5) that produce type IV collagen in basement membranes. Children typically have microscopic blood in the urine from early childhood, with progressive hearing loss developing over time. The X-linked form is most common and more severe in males, who may progress to kidney failure in their teens to thirties. Early treatment with ACE inhibitors can significantly delay kidney disease progression.
- Usually normal when: A single urinalysis showing trace blood that is not confirmed on repeat testing
- Call your doctor if: Your child has visible blood in the urine that persists for more than a day or is accompanied by pain, swelling, or decreased urine output
- Varies by age — see the age-by-age breakdown below
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What Parents Should Know
According to NIDDK, ASN, AAP guidelines, alport syndrome is a genetic condition that affects the kidneys, hearing, and eyes due to mutations in genes (COL4A3, COL4A4, or COL4A5) that produce type IV collagen in basement membranes. Children typically have microscopic blood in the urine from early childhood, with progressive hearing loss developing over time. The X-linked form is most common and more severe in males, who may progress to kidney failure in their teens to thirties. Early treatment with ACE inhibitors can significantly delay kidney disease progression. At 0-12 months, alport syndrome is rarely diagnosed in infancy unless there is a known family history. Microscopic hematuria (blood visible only on urine testing) may be present from birth but is usually found incidentally. Newborn hearing screening is typically normal at this stage. If there is a family history of Alport syndrome, early genetic testing and baseline hearing evaluation can be arranged through a pediatric nephrologist. It is generally considered normal when a single urinalysis showing trace blood that is not confirmed on repeat testing. However, you should contact your pediatrician promptly if your child has visible blood in the urine that persists for more than a day or is accompanied by pain, swelling, or decreased urine output.
Normal vs. Concerning
When to Seek Immediate Care
- Your child has visible blood in the urine that persists for more than a day or is accompanied by pain, swelling, or decreased urine output
- Your child with known Alport syndrome develops sudden worsening of symptoms such as significant swelling, high blood pressure, or severe fatigue indicating possible kidney function decline
- Your child has sudden hearing loss or a rapid change in hearing ability
- Your child develops vision changes, eye pain, or other eye symptoms that could relate to anterior lenticonus or other ocular findings of Alport syndrome
By Age
What to expect by age
0-12 months
Alport syndrome is rarely diagnosed in infancy unless there is a known family history. Microscopic hematuria (blood visible only on urine testing) may be present from birth but is usually found incidentally. Newborn hearing screening is typically normal at this stage. If there is a family history of Alport syndrome, early genetic testing and baseline hearing evaluation can be arranged through a pediatric nephrologist.
1-5 years
Microscopic hematuria is often the earliest and sometimes only finding in young children with Alport syndrome. It may be discovered on routine urinalysis or during evaluation for another issue. Episodes of gross (visible) hematuria may occur with febrile illnesses or upper respiratory infections. Hearing is usually still normal at this age. If your child has persistent microscopic hematuria, especially with a family history of kidney disease or hearing loss, your pediatrician may refer to a nephrologist for evaluation.
5-12 years
By school age, boys with X-linked Alport syndrome may begin to show proteinuria (protein in urine) in addition to hematuria. Sensorineural hearing loss typically develops during late childhood or early adolescence and initially affects high-frequency sounds. An audiogram should be performed regularly. Eye findings such as anterior lenticonus (cone-shaped lens) or retinal flecks may be detected on ophthalmologic exam. Starting ACE inhibitor therapy when proteinuria develops has been shown to significantly delay progression to kidney failure.
12 years+
Adolescent males with X-linked Alport syndrome often have progressive proteinuria and may develop declining kidney function. Hearing loss becomes more noticeable and may affect conversational frequencies. Regular monitoring by a nephrologist with blood pressure control, ACE inhibitor therapy, and audiologic and ophthalmologic follow-up is essential. Females with X-linked Alport syndrome (carriers) usually have a milder course, often with only microscopic hematuria, though some develop significant kidney disease later in life.
What to Tell Your Pediatrician
- Describe when you first noticed alport syndrome in children and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if your child has persistent microscopic hematuria found on two or more urine tests.
- Mention if there is a family history of kidney failure, dialysis, kidney transplant, or unexplained hearing loss, especially in males.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- A single urinalysis showing trace blood that is not confirmed on repeat testing
- Your child's hearing screening at school or at the pediatrician was normal
- Your child has no family history of kidney disease, hearing loss, or Alport syndrome and has normal urine tests
- Transient pink or dark urine that is explained by food coloring, beets, or dehydration and does not recur
- Your child has persistent microscopic hematuria found on two or more urine tests
- There is a family history of kidney failure, dialysis, kidney transplant, or unexplained hearing loss, especially in males
- Your child has been diagnosed with Alport syndrome and you have questions about treatment, monitoring, or genetic implications for family members
- Your child seems to have difficulty hearing or is not responding normally to sounds or speech
- Your child has visible blood in the urine that persists for more than a day or is accompanied by pain, swelling, or decreased urine output
- Your child with known Alport syndrome develops sudden worsening of symptoms such as significant swelling, high blood pressure, or severe fatigue indicating possible kidney function decline
- Your child has sudden hearing loss or a rapid change in hearing ability
- Your child develops vision changes, eye pain, or other eye symptoms that could relate to anterior lenticonus or other ocular findings of Alport syndrome
What You Can Do at Home
- Keep track of when you notice alport syndrome in children — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that a single urinalysis showing trace blood that is not confirmed on repeat testing — this is generally within the range of normal.
- At 0-12 months, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Follow any care instructions from your pediatrician. Keep a written log of symptoms to bring to appointments.
- While monitoring at home, seek immediate care if your child has visible blood in the urine that persists for more than a day or is accompanied by pain, swelling, or decreased urine output.
Related Conditions
Signs of Hearing Loss in Babies
Most babies are screened for hearing loss at birth, but some hearing problems develop later or are missed. Early signs include not startling to loud sounds, not turning toward voices by 6 months, or not babbling by 9 months. Catching hearing loss early is critical for language development.
baby blood in urine
Related Resources
Frequently asked questions
Is alport syndrome in children normal?
When should I call the doctor about alport syndrome in children?
When is alport syndrome in children normal?
What causes alport syndrome in children?
What should I mention to my pediatrician about alport syndrome in children?
Is alport syndrome in children normal at 0-12 months?
Is alport syndrome in children normal at 1-5 years?
Should I go to the ER for alport syndrome in children?
Does alport syndrome in children go away on its own?
References
- [1]National Institute of Diabetes and Digestive and Kidney Diseases. Alport Syndrome. NIH, 2023. NIDDK
- [2]Kashtan CE. Alport Syndrome: An Inherited Disorder of Renal, Ocular, and Cochlear Basement Membranes. Journal of the American Society of Nephrology, 1999. ASN
- [3]American Academy of Pediatrics. Evaluation of Hematuria in Children. Pediatrics in Review, 2021. AAP
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Alport Syndrome in Children.
Things to mention
- Describe when you first noticed alport syndrome in children and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if your child has persistent microscopic hematuria found on two or more urine tests.
- Mention if there is a family history of kidney failure, dialysis, kidney transplant, or unexplained hearing loss, especially in males.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- Your child has persistent microscopic hematuria found on two or more urine tests
- There is a family history of kidney failure, dialysis, kidney transplant, or unexplained hearing loss, especially in males
- Your child has been diagnosed with Alport syndrome and you have questions about treatment, monitoring, or genetic implications for family members
Urgent signs to report immediately
- Your child has visible blood in the urine that persists for more than a day or is accompanied by pain, swelling, or decreased urine output
- Your child with known Alport syndrome develops sudden worsening of symptoms such as significant swelling, high blood pressure, or severe fatigue indicating possible kidney function decline
- Your child has sudden hearing loss or a rapid change in hearing ability
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members
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Bottom line
Most cases of alport syndrome in children are normal. Talk to your pediatrician if your child has visible blood in the urine that persists for more than a day or is accompanied by pain, swelling, or decreased urine output.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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How to Advocate for Your Child's Needs
You know your child better than anyone, and your observations matter. If you feel something is not right with your child's development or health, you have every right to ask questions, request evaluations, and seek second opinions. Advocating for your child is not being difficult - it is being a good parent.