Final answer:
The total diffuse reflectance spectrum alone is not sufficient to measure bilirubin concentration in transcutaneous bilirubin measurements because it does not provide specific information about the concentration. Additional methods, such as the Direct or Indirect Van Den Bergh test, are needed.
Step-by-step explanation:
The total diffuse reflectance spectrum alone is not sufficient to measure bilirubin concentration in transcutaneous bilirubin measurements because the spectrum does not provide specific information about the concentration of bilirubin. While diffuse reflectance can give an overall indication of the presence of bilirubin in a sample, it cannot accurately quantify the concentration. To measure the bilirubin concentration, additional methods, such as the Direct or Indirect Van Den Bergh test, are needed.