Yes, agree that they are same analyte.
Bilirubin fractions may be measured either directly, or calculated from the results of direct measurements of other bilirubin fractions. With VITROS (Chemistry) Systems, TBIL, Bu, and Bc are directly measured. Other, more conventional bilirubin methods, especially those employing diazo chemistry, directly measure both total bilirubin and the direct bilirubin fraction (approximately equivalent to Bc), but cannot directly measure unconjugated bilirubin (Bu).
http://vinylsocks.com/msnac/images/Bilirubin.pdf
Would ‘Indirect bilirubin [Moles/volume] in Serum or Plasma by Direct assay’ is fine?
Thanks.