Table 1.

Manufacturer specifications (package insert) for the direct bilirubin methods.

Method	Hemolysis index limit	Lipemia index limit	Linearity of method (mg/dL)	Dilution protocol	Reference range (mg/dL)
Roche diagnostics	30	60	0.2–10.0	Manual	0.0–0.3
Diazyme laboratories	500	Not listed	0.1–20.0	Auto-dilution	0.0–0.2
Randox laboratories	1000	1000	0.1–15.4	Auto-dilution	0.0–0.2