The reference range for alkaline phosphate (ALP) varies depending on the laboratory and the method used. Generally, the normal range for adults is between 40 and 130 IU/L (international units per liter).

ALP of 135 IU/L falls within the higher end of normal range.

However, It's important to note that ALP levels can be affected by various factors, including age, sex, ethnicity, and underlying medical conditions. For this reason, it's essential to interpret ALP results in the context of the individual's overall health and other relevant laboratory findings. If your ALP level is consistently elevated, it's important to consult with a healthcare professional for further evaluation to determine the cause and appropriate management.