# Set reference line for alkaline phosphatase

Use this option to specify a custom reference line for the alkaline phosphatase test (ALP) to be drawn on the Hy’s Law plot.

### To Set a Reference Line for Bilirubin:

| 8 | Check the Set custom reference lines for Hy’s Law plots box to enable this option.

| 8 | Either enter the desired value in the text field or move the slider to the right or to the left to change the value.

Tip: To change the scale of the slider, right-click on the slider and select
from the pop-up menu. Change the upper or lower boundaries in the that appears, to rescale the slider and click
.