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Neonatal Creatinine (Serum)

Published: August 9, 2026Updated: August 16, 2026

This test measures the level of creatinine, a waste product from muscle metabolism, in your baby’s blood to assess kidney function.

Quick summary

["Kidney health check for newborns helps detect early signs of kidney issues."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
11471-0
Short code
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Synonyms
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Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Doctors may order this test for newborns to monitor kidney function, especially if there are signs of dehydration, birth complications, or suspected kidney problems. It helps ensure your baby’s kidneys are working properly right after birth.

What to Expect Before the Test

No special preparation is needed. The test is typically done by drawing a small amount of blood from your baby’s heel. It may cause a brief pinch, but it’s usually over quickly.

What Happens During the Test?

A healthcare provider will clean the area, insert a tiny needle into your baby’s heel, and collect a small blood sample. The process is quick and usually done in the hospital or clinic.

What Are Possible Results?

Results are compared to standard reference ranges for newborns. Abnormally high or low levels may signal potential kidney or health concerns that need further evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

High creatinine levels in newborns can indicate impaired kidney function, which may require additional tests or medical attention. Low levels might be less concerning but should still be reviewed by a healthcare provider to rule out other factors like dehydration or muscle issues.

Short name

Creatinine (Serum)

Frequently asked questions

What does a high creatinine level mean in a newborn?
A high creatinine level may suggest your baby’s kidneys are not filtering waste efficiently, which could be due to kidney problems, birth complications, or other health conditions. Your doctor will discuss next steps based on the results.
How soon will I get my baby’s test results?
Results are usually available within a few days, depending on the lab. Your healthcare provider will contact you directly with the findings.
Can I do anything to prepare my baby for this test?
No special preparation is needed, but ensure your baby is well-hydrated before the test if advised by your doctor.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy