Alkaline phosphate level of 170 for a 50 year old man .. is it worrysome ?

Worrisome: unlikely.: Any time a panel of tests are run there is a probability of one of these test to be outside the normal range. Meaning one out of many is likely not concerning especially if it is not significantly elevated. An elevated Alk Phos could indicate bone or hepatobiliary disease. If you are otherwise healthy the best approach would be to repeat the testing in 6 to 12 months.

Not: Increased ap level by itself not worrisome but recheck in a few months to further evaluate the level

Needs follow up: Alkaline phosphatase is an enzyme found in many organs of the body, including the liver, bones, and muscles, among others. It is impossible to analyze this number on its own. We need to see the rest of your liver numbers and electrolytes, and may need further tests beyond that to sort that out. I would see your doctor for the next step.