Konica Minolta JM-103 User Manual page 12

By calculating the difference in the optical densities, the parts that are
common to the epidermis and dermis are deducted, and as a result, the
difference in the optical densities between the two wavelength regions
can be obtained for the subcutaneous tissue only. Since the optical
density difference shows a linear correlation with the total serum
bilirubin concentration, it is converted to the estimated bilirubin
concentration and is indicated digitally.
The Jaundice Meter (JM-103) device software uses a correlation
coefficient to convert the measurement difference from the dual optical
path to an estimated bilirubin concentration. The calculation formula
used includes the correlation coefficients α and γ. These coefficients
were determined in pre-clinical testing. The equation used is as follows:
= α(L-S) + γ
J
sample
Where L and S are the long and short optical path measurements.
Use of the Device
Patient Population
The Jaundice Meter (JM-103) is indicated for use in neonatal patients
born >35 weeks gestation who have not undergone transfusion or
phototherapy treatment.
Page 2 - 4 Jaundice Meter (Model JM-103) User Manual (usr070rb)