Newborn Metabolic Screening Results
Medically reviewed by Dr. Michael Okonkwo, MD, FAAP · Board-Certified Neonatologist
Content reviewed against published AAP, NIH guidelines
Last reviewed:
If your baby has been diagnosed with or you suspect newborn metabolic screening results, here is what the evidence says.
The short answer
The newborn metabolic screen (heel prick blood test) checks for dozens of rare but treatable conditions including metabolic disorders, endocrine disorders, and hemoglobinopathies. Most babies have normal results. An abnormal result requires follow-up testing but does not mean your baby definitely has a condition. Many initial abnormal results turn out to be false positives.
Key takeaways
- The newborn metabolic screen (heel prick blood test) checks for dozens of rare but treatable conditions including metabolic disorders, endocrine disorders, and hemoglobinopathies. Most babies have normal results. An abnormal result requires follow-up testing but does not mean your baby definitely has a condition. Many initial abnormal results turn out to be false positives.
- Usually normal when: Normal newborn screening results
- Call your doctor if: You receive an urgent callback about newborn screening results and are asked to bring baby in immediately
- Varies by age — see the age-by-age breakdown below
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What Parents Should Know
According to AAP, NIH guidelines, the newborn metabolic screen (heel prick blood test) checks for dozens of rare but treatable conditions including metabolic disorders, endocrine disorders, and hemoglobinopathies. Most babies have normal results. An abnormal result requires follow-up testing but does not mean your baby definitely has a condition. Many initial abnormal results turn out to be false positives. At 0-1 month, the newborn screening blood test is done 24-48 hours after birth via a heel prick. It screens for 30-50+ conditions (varies by state) including phenylketonuria (PKU), congenital hypothyroidism, sickle cell disease, cystic fibrosis, galactosemia, and many more. Results typically come back within 1-2 weeks. If results are normal, you may not even be contacted. If a result is abnormal, you will be contacted for follow-up testing. An abnormal result does not confirm a diagnosis; it means additional testing is needed. Many abnormal results are false positives. If a condition is confirmed, early treatment can prevent serious complications. It is generally considered normal when normal newborn screening results. However, you should contact your pediatrician promptly if you receive an urgent callback about newborn screening results and are asked to bring baby in immediately.
Normal vs. Concerning
By Age
What to expect by age
0-1 month
The newborn screening blood test is done 24-48 hours after birth via a heel prick. It screens for 30-50+ conditions (varies by state) including phenylketonuria (PKU), congenital hypothyroidism, sickle cell disease, cystic fibrosis, galactosemia, and many more. Results typically come back within 1-2 weeks. If results are normal, you may not even be contacted. If a result is abnormal, you will be contacted for follow-up testing. An abnormal result does not confirm a diagnosis; it means additional testing is needed. Many abnormal results are false positives. If a condition is confirmed, early treatment can prevent serious complications.
1-3 months
Follow-up testing for any abnormal screening results should be completed promptly. If a condition is confirmed (such as congenital hypothyroidism, which is the most commonly confirmed condition), treatment is started immediately. Early treatment for most screened conditions leads to normal or near-normal development.
3-6 months
If a condition was diagnosed and treatment started, your baby will be monitored by a specialist. If follow-up testing was normal, no further action is needed. Some states require a second screening at 1-2 weeks of age.
6-12 months
Ongoing monitoring and treatment for any confirmed conditions. Babies with conditions detected early through newborn screening generally have excellent outcomes with appropriate treatment.
What to Tell Your Pediatrician
- Describe when you first noticed newborn metabolic screening results and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if you received notification of an abnormal screening result and want to understand next steps.
- Mention if you are unsure whether your baby's newborn screen has been completed or results received.
- 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
- Normal newborn screening results
- Baby is feeding well, gaining weight, and developing normally
- No follow-up needed for normal results
- You received notification of an abnormal screening result and want to understand next steps
- You are unsure whether your baby's newborn screen has been completed or results received
- Family history of genetic or metabolic conditions
- You receive an urgent callback about newborn screening results and are asked to bring baby in immediately
- Baby develops poor feeding, excessive sleepiness, vomiting, or unusual odor before screening results are known
What You Can Do at Home
- Keep track of when you notice newborn metabolic screening results — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that normal newborn screening results — this is generally within the range of normal.
- At 0-1 month, 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 you receive an urgent callback about newborn screening results and are asked to bring baby in immediately.
Related Conditions
Abnormal Newborn Screening Results
An abnormal or positive newborn screening result means that further testing is needed, not that your baby definitely has a condition. Most positive screens turn out to be false positives after confirmatory testing. Newborn screening tests are intentionally sensitive to avoid missing any affected babies, so follow-up testing is essential to determine whether the result is a true positive.
Congenital Hypothyroidism in Babies
Congenital hypothyroidism occurs when a baby is born with an underactive or absent thyroid gland, affecting about 1 in 2,000 to 4,000 newborns. Thanks to universal newborn screening, most cases are detected within days of birth before symptoms develop. When treated promptly with daily thyroid hormone medication, children develop normally with no intellectual impairment.
Related Resources
Frequently asked questions
Is newborn metabolic screening results normal?
When should I call the doctor about newborn metabolic screening results?
When is newborn metabolic screening results normal?
What causes newborn metabolic screening results?
What should I mention to my pediatrician about newborn metabolic screening results?
Is newborn metabolic screening results normal at 0-1 month?
Is newborn metabolic screening results normal at 1-3 months?
Should I go to the ER for newborn metabolic screening results?
Does newborn metabolic screening results go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Newborn Metabolic Screening Results.
Things to mention
- Describe when you first noticed newborn metabolic screening results and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if you received notification of an abnormal screening result and want to understand next steps.
- Mention if you are unsure whether your baby's newborn screen has been completed or results received.
- 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
- You received notification of an abnormal screening result and want to understand next steps
- You are unsure whether your baby's newborn screen has been completed or results received
- Family history of genetic or metabolic conditions
Urgent signs to report immediately
- You receive an urgent callback about newborn screening results and are asked to bring baby in immediately
- Baby develops poor feeding, excessive sleepiness, vomiting, or unusual odor before screening results are known
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
Related Resources
Bottom line
Most cases of newborn metabolic screening results are normal. Talk to your pediatrician if you receive an urgent callback about newborn screening results and are asked to bring baby in immediately.
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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Related Medical Concerns
Abnormal Newborn Screening Results
An abnormal or positive newborn screening result means that further testing is needed, not that your baby definitely has a condition. Most positive screens turn out to be false positives after confirmatory testing. Newborn screening tests are intentionally sensitive to avoid missing any affected babies, so follow-up testing is essential to determine whether the result is a true positive.
Congenital Hypothyroidism in Babies
Congenital hypothyroidism occurs when a baby is born with an underactive or absent thyroid gland, affecting about 1 in 2,000 to 4,000 newborns. Thanks to universal newborn screening, most cases are detected within days of birth before symptoms develop. When treated promptly with daily thyroid hormone medication, children develop normally with no intellectual impairment.
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
Achondroplasia (Dwarfism) in Babies
Achondroplasia is the most common form of short-limbed dwarfism, affecting about 1 in 15,000 to 40,000 births. It is caused by a mutation in the FGFR3 gene and is usually apparent at birth with characteristic features including short limbs, a larger head, and a prominent forehead. Intelligence is normal. With monitoring for specific complications and supportive care, children with achondroplasia lead full, active, and independent lives.
Adenoid Hypertrophy and Breathing
Adenoids are lymphoid tissue located behind the nose that help fight infection in young children. When adenoids become enlarged (adenoid hypertrophy), they can block the nasal airway, causing chronic mouth breathing, snoring, nasal speech, and sleep-disordered breathing. Enlarged adenoids are most common between ages 2-7 and are a leading cause of obstructive sleep apnea in young children. Treatment ranges from watchful waiting and nasal steroids to surgical removal (adenoidectomy) if breathing or sleep is significantly affected.
Adrenoleukodystrophy (ALD) in Babies
X-linked adrenoleukodystrophy (X-ALD) is a genetic disorder affecting about 1 in 17,000 newborns, caused by mutations in the ABCD1 gene on the X chromosome. It primarily affects boys and impairs the breakdown of very long-chain fatty acids (VLCFAs), which accumulate and damage the myelin sheath in the brain and the adrenal glands. The most severe form, cerebral ALD, typically affects boys between ages 4-10 with rapid neurological decline. Newborn screening now enables early detection, and hematopoietic stem cell transplant or gene therapy performed before significant brain involvement can be life-saving.