Newborn Screening (Heel Prick Test)
A blood test from a baby's heel in the first days of life to check for rare but serious conditions.
Quick Summary
To find conditions such as congenital hypothyroidism, G6PD deficiency and some metabolic disorders early.
Markers for several treatable conditions.
Usually done 2–5 days after birth.
Overview
Early treatment can prevent serious problems.
Available tests vary by state and hospital.
What It Measures
Thyroid
Congenital hypothyroidism.
Enzymes
G6PD and metabolic conditions.
How It's Performed
- 01
Warm heel
Baby's heel is warmed.
- 02
Prick
A few drops of blood on a card.
- 03
Comfort
Feeding helps soothe the baby.
Interpreting Results & Next Steps
Discuss with Doctor
Your doctor will explain what your result means and what happens next.
If values are High:
An abnormal screen needs prompt confirmatory tests.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Newborn Screening(opens in a new tab) · MedlinePlus, US National Library of Medicine