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October 1986

Transcutaneous Bilirubinometry: III. Dermal Bilirubin Kinetics Under Green and Blue Light Phototherapy

Author Affiliations

From the Division of Neonatology, Department of Pediatrics, University of Medicine and Dentistry of New Jersey–Robert Wood Johnson Medical School, St Peter's Medical Center, New Brunswick, NJ (Drs Hegyi, Graff, Hiatt, and Sisson); and the Department of Pediatrics, Monmouth Medical Center, Longbranch, NJ (Dr Zapanta).

Am J Dis Child. 1986;140(10):994-997. doi:10.1001/archpedi.1986.02140240040022

• Using the transcutaneous bilirubinometer, we studied the response of cutaneous bilirubin to different colors of light during phototherapy. Three groups of ten infants were exposed to blue, green, and blue-green lights at a mean postnatal age ranging from 50 to 77 hours. Patched areas served as controls. Every 15 minutes during four hours of phototherapy, we obtained simultaneous measurements from exposed and covered areas. After the onset of phototherapy, transcutaneous bilirubinometer values from the covered areas in all groups remained stable. The overall rate of bleaching was lowest in the green light group and highest in the blue-green combination group. In this group of infants, green light appeared to enhance the effectiveness of blue light in reducing dermal bilirubin concentrations as measured by the transcutaneous bilirubinometer.

(AJDC 1986;140:994-997)