Which units of measurement will be used with lab values on the REx-PN exam? Kelly July 31, 2023 17:51 Updated Measurements are provided in metric units. Related articles What is the current format and item types for the NCLEX? Why can't I go back and review the previous questions? What is the REx-PN refund policy? How do I register for the REx-PN? What types of questions will be on the REx-PN, and how often will candidates get each type?