CEN Practice Exam (Certified Emergency Nurse)

Answer: B - An area of induration measuring 10 mm would indicate a positive result in children less than 4 years old. An area of induration 5 mm or greater would be considered positive in any high risk patients, such as those with HIV. An area of induration 15 mm or larger would be considered positive for patient four years old or older with no high risks for tuberculosis.