Phlebotomy Technician Practice Exam (NCPT/CPT) 2026 - Free Phlebotomy Practice Questions and Study Guide

Phenylketonuria is a genetic disorder that can cause a buildup of certain amino acids in the body, which can be toxic to the brain. If left undetected or untreated, this can result in severe and irreversible brain damage. While liver, heart, and kidney damage can also occur with this condition, they are not the main concern and can often be managed with proper care and treatment. Therefore, C is the best answer as it reflects the most serious and significant consequence of undetected Phenylketonuria.