CRT may refer to:

• CRT (genetics), a gene cluster
• Calreticulin, a protein

• Capillary refill time, the rate at which blood refills empty capillaries
• Cognitive Retention Therapy, a dementia treatment
• Cardiac resynchronization therapy, a treatment for heart failure
  • CRT-D, an implanted cardiac resynchronization device
• Corneal Refractive Therapy, in optometrics
• Certified Respiratory Therapist, a respiratory therapist who works under the direction of Registered respiratory therapists and Physicians
• Chemo-radiotherapy - a combination of chemotherapy and radiotherapy e.g. to treat cancer.

• Cathode ray tube, a type of vacuum tube used for information displays (monitors or TVs) or oscilloscopes
• Computer monitor – acronym for a screen using Cathode Ray Tube technology, especially pre-LCD

• Crisis response team, an emergency response team

• Cognitive Reflection Test, a three-item intelligence test by Shane Frederick focused on testing how rational people are

• CRT. capillary refill time. For example, “capillary refill time is 3 seconds.” (0-8117-3306-8)