PINP test

This site has it for $159, but not all states allow lab tests from sites like this.
https://www.ultalabtests.com/testing/search

Check out Jasonhealth website for a price comparison. There is a discussion:
https://connect.mayoclinic.org/discussion/self-pay-for-ctx-p1np/
It's best to consistently use the same lab to avoid discrepancies in blood sample handling and assay types.