Every two years, phlebotomists with a Certified Phlebotomy Technician (CPT) certification must go through a renewal process. This ensures that they are up to date with any changes in the field and are committed to continuing their work. To renew, phlebotomists must have a current CPT certification and may choose to take additional classes to enhance their skills. Meeting deadlines for renewal is crucial, as an expired certification can impact their ability to work in the field.