Pulse Oximetry Screening in Newborns
Medically reviewed by Dr. Michael Okonkwo, MD, FAAP · Board-Certified Neonatologist
Content reviewed against published AAP, CDC guidelines
Last reviewed:
If your baby has been diagnosed with or you suspect pulse oximetry screening in newborns, here is what the evidence says.
The short answer
Pulse oximetry screening (measuring blood oxygen levels) is done on all newborns before hospital discharge to screen for critical congenital heart disease (CCHD). A normal result is reassuring but does not rule out all heart defects. An abnormal result requires further evaluation but does not necessarily mean there is a problem. Most babies with abnormal results have normal hearts.
Key takeaways
- Pulse oximetry screening (measuring blood oxygen levels) is done on all newborns before hospital discharge to screen for critical congenital heart disease (CCHD). A normal result is reassuring but does not rule out all heart defects. An abnormal result requires further evaluation but does not necessarily mean there is a problem. Most babies with abnormal results have normal hearts.
- Usually normal when: Oxygen saturation 95% or above in both right hand and foot with less than 3% difference
- Call your doctor if: Failed pulse ox screening requires immediate follow-up evaluation
- Varies by age — see the age-by-age breakdown below
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What Parents Should Know
According to AAP, CDC guidelines, pulse oximetry screening (measuring blood oxygen levels) is done on all newborns before hospital discharge to screen for critical congenital heart disease (CCHD). A normal result is reassuring but does not rule out all heart defects. An abnormal result requires further evaluation but does not necessarily mean there is a problem. Most babies with abnormal results have normal hearts. At 0-1 month, pulse oximetry screening is performed at 24-48 hours of age by placing a sensor on the baby's right hand and one foot. Normal oxygen saturation is 95% or above with less than a 3% difference between the two sites. A failed screen (oxygen below 95% or a difference above 3%) may indicate a CCHD that reduces oxygen levels. However, false positives occur, and an abnormal screen does not confirm heart disease. Follow-up includes repeat screening, echocardiography, and clinical evaluation. If a CCHD is confirmed, early treatment significantly improves outcomes. It is generally considered normal when oxygen saturation 95% or above in both right hand and foot with less than 3% difference. However, you should contact your pediatrician promptly if failed pulse ox screening requires immediate follow-up evaluation.
Normal vs. Concerning
By Age
What to expect by age
0-1 month
Pulse oximetry screening is performed at 24-48 hours of age by placing a sensor on the baby's right hand and one foot. Normal oxygen saturation is 95% or above with less than a 3% difference between the two sites. A failed screen (oxygen below 95% or a difference above 3%) may indicate a CCHD that reduces oxygen levels. However, false positives occur, and an abnormal screen does not confirm heart disease. Follow-up includes repeat screening, echocardiography, and clinical evaluation. If a CCHD is confirmed, early treatment significantly improves outcomes.
1-3 months
If the pulse ox screen was normal and baby is doing well, no further testing is needed. If a heart defect was identified, the pediatric cardiologist will manage ongoing care. Some heart defects present after discharge, so continue to watch for signs like blue/gray skin, rapid breathing, and poor feeding.
3-6 months
Continued monitoring if a heart defect was identified. Normal screening does not rule out all heart conditions, so report any new symptoms to your pediatrician.
6-12 months
Ongoing follow-up for any identified cardiac condition. Normal screening in the newborn period is reassuring.
What to Tell Your Pediatrician
- Describe when you first noticed pulse oximetry screening in newborns and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if you have questions about what the screening means or your baby's results.
- Mention if family history of congenital heart disease.
- 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
- Oxygen saturation 95% or above in both right hand and foot with less than 3% difference
- Baby is pink, feeding well, and breathing comfortably
- Screening passed on first attempt
- You have questions about what the screening means or your baby's results
- Family history of congenital heart disease
- You notice any color changes in your baby after going home
- Failed pulse ox screening requires immediate follow-up evaluation
- Baby appears blue or gray, has rapid or labored breathing, or is feeding poorly after discharge
What You Can Do at Home
- Keep track of when you notice pulse oximetry screening in newborns — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that oxygen saturation 95% or above in both right hand and foot with less than 3% difference — 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 failed pulse ox screening requires immediate follow-up evaluation.
Related Conditions
Congenital Heart Defect Signs in Babies
Congenital heart defects (CHDs) are the most common type of birth defect, affecting about 1 in 100 babies. They range from small holes in the heart that may close on their own to complex defects requiring multiple surgeries. Early detection through pulse oximetry screening and recognizing key signs — such as blue skin, rapid breathing, poor feeding, and failure to gain weight — is critical. Advances in surgery have dramatically improved survival and quality of life.
Heart Murmur Detected at Birth
Heart murmurs are very common in newborns and are often innocent (harmless). They are extra sounds heard with a stethoscope caused by blood flowing through the heart. Many murmurs detected at birth resolve on their own as the circulatory system transitions from fetal to newborn circulation. Your pediatrician may order an echocardiogram to confirm the murmur is innocent.
My Baby Turns Blue (Cyanosis)
Blue or purple discoloration limited to a baby's hands and feet (acrocyanosis) is very common in newborns and usually harmless, caused by immature circulation. However, blue coloring of the lips, tongue, face, or trunk (central cyanosis) is always a medical emergency that requires immediate evaluation, as it may indicate a heart or lung problem.
Related Resources
Frequently asked questions
Is pulse oximetry screening in newborns normal?
When should I call the doctor about pulse oximetry screening in newborns?
When is pulse oximetry screening in newborns normal?
What causes pulse oximetry screening in newborns?
What should I mention to my pediatrician about pulse oximetry screening in newborns?
Is pulse oximetry screening in newborns normal at 0-1 month?
Is pulse oximetry screening in newborns normal at 1-3 months?
Should I go to the ER for pulse oximetry screening in newborns?
Does pulse oximetry screening in newborns go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Pulse Oximetry Screening in Newborns.
Things to mention
- Describe when you first noticed pulse oximetry screening in newborns and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if you have questions about what the screening means or your baby's results.
- Mention if family history of congenital heart disease.
- 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 have questions about what the screening means or your baby's results
- Family history of congenital heart disease
- You notice any color changes in your baby after going home
Urgent signs to report immediately
- Failed pulse ox screening requires immediate follow-up evaluation
- Baby appears blue or gray, has rapid or labored breathing, or is feeding poorly after discharge
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
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Related Resources
Bottom line
Most cases of pulse oximetry screening in newborns are normal. Talk to your pediatrician if failed pulse ox screening requires immediate follow-up evaluation.
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
Congenital Heart Defect Signs in Babies
Congenital heart defects (CHDs) are the most common type of birth defect, affecting about 1 in 100 babies. They range from small holes in the heart that may close on their own to complex defects requiring multiple surgeries. Early detection through pulse oximetry screening and recognizing key signs — such as blue skin, rapid breathing, poor feeding, and failure to gain weight — is critical. Advances in surgery have dramatically improved survival and quality of life.
Heart Murmur Detected at Birth
Heart murmurs are very common in newborns and are often innocent (harmless). They are extra sounds heard with a stethoscope caused by blood flowing through the heart. Many murmurs detected at birth resolve on their own as the circulatory system transitions from fetal to newborn circulation. Your pediatrician may order an echocardiogram to confirm the murmur is innocent.
My Baby Turns Blue (Cyanosis)
Blue or purple discoloration limited to a baby's hands and feet (acrocyanosis) is very common in newborns and usually harmless, caused by immature circulation. However, blue coloring of the lips, tongue, face, or trunk (central cyanosis) is always a medical emergency that requires immediate evaluation, as it may indicate a heart or lung problem.
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.