7
Plot the Result on the Transcutaneous Bilirubin Nomogram
(Neonates Up to 96 Hours of Age Only)
*4
(35 weeks of gestation)
On the horizontal axis, find the baby’s age in hours. Follow this line up
along the vertical axis to the point where it meets the transcutaneous
bilirubin meter reading you just obtained. Make a small circle where these
two values intersect. You can now see into which percentile range the
baby’s TcB value falls.
In the example above, the baby’s TcB is 10 mg/dL at 50 hours of age. This
places the baby just at the edge of the 95
th
percentile. [A TSB should be
obtained on this baby.]
Consult your department policy or routine orders regarding when to send a
total serum bilirubin to the laboratory, and/or report these TcB results to the
baby’s physician.
Subsequent TcB measurements should also be plotted on the graph to allow
detection of an unusual trend such as a rapidly rising TcB.
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