In plain words
Transcutaneous bilirubin is a quick, non-invasive test that estimates a newborn's level. A small device is placed against the skin, usually the forehead or chest, and gives a number in seconds. The reading is compared with hour-specific thresholds for the baby's age. Visual checks of are unreliable, especially in babies with darker skin. A high reading usually leads to a blood test, which is more precise. The test is a screen, not a diagnosis. Results are read together with the baby's weight, feeding, and risk factors. Your care team can explain the number and the next step.
The deeper version
A spectrophotometric device estimates bilirubin in the skin and subcutaneous tissue at selected wavelengths. Moyer and colleagues (2000) and later studies show that visual estimates by clinicians and parents are unreliable, particularly in infants with darker skin, which is why TcB is plotted against hour-specific thresholds (AAP 2022). Accuracy declines at higher levels and is affected by skin thickness and , so a serum total bilirubin is needed to confirm high values. The AAP guideline sets when a TcB reading should be followed by serum testing.
Where it comes up
- Feeding a baby with jaundiceFeeding Your Baby
- Newborn jaundiceBaby Basics
- The hospital stay: what happens, what to askBirth and the First Days
What mothers here say about transcutaneous bilirubin
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Sources
- American Academy of Pediatrics — Clinical Practice Guideline: Management of Hyperbilirubinemia in the Newborn Infant 35 or More Weeks of Gestation, 2022
- Moyer VA, Ahn C, Sneed S — Accuracy of clinical judgment in neonatal jaundice. Archives of Pediatrics and Adolescent Medicine 2000