CRT or Crt may refer to:

Science, technology, and mathematics

Medicine and biology

* Calreticulin, a protein *

Capillary refill Capillary refill time (CRT) is defined as the time taken for color to return to an external capillary bed after pressure is applied to cause blanching. It can be measured by holding a hand higher than heart-level and pressing the soft pad of a f ...

time, for blood to refill capillaries *

Cardiac resynchronization therapy Cardiac resynchronisation therapy (CRT or CRT-P) is the insertion of electrodes in the left and right ventricles of the heart, as well as on occasion the right atrium, to treat heart failure by coordinating the function of the left and right ve ...

and CRT defibrillator (CRT-D) * Catheter-related thrombosis, the development of a blood clot related to long-term use of central venous catheters *

Certified Respiratory Therapist A Certified Respiratory Therapist (CRT), formerly Certified Respiratory Therapy Technician (CRTT), is a therapist who has graduated from a respiratory therapy program at a university or college and has passed a national certification exam. A CRT or ...

Chemoradiotherapy Chemoradiotherapy (CRT, CRTx, CT-RT) is the combination of chemotherapy and radiotherapy to treat cancer. Synonyms include radiochemotherapy (RCT, RCTx, RT-CT) and chemoradiation. It is a type of multimodal cancer therapy. Chemoradiation can be ' ...

, chemo- and radiotherapy combined * Cognitive Retention Therapy, for dementia *

Corneal Refractive Therapy Orthokeratology, also referred to as Night lenses, Ortho-K, OK, Overnight Vision Correction, Corneal Refractive Therapy (CRT), Accelerated Orthokeretology, Cornea Corrective Contacts, Eccentricity Zero Molding, and Gentle Vision Shaping System (GVS ...

, in optometrics * CRT (genetics), a gene cluster

Mathematics and technology

Cathode-ray tube A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. The images may represent electrical waveforms (oscilloscope), pictur ...

, a display *

Chinese remainder theorem In mathematics, the Chinese remainder theorem states that if one knows the remainders of the Euclidean division of an integer ''n'' by several integers, then one can determine uniquely the remainder of the division of ''n'' by the product of thes ...

in number theory * Microsoft C Run-Time library *

SecureCRT SecureCRT is a commercial SSH and Telnet client and terminal emulator by VanDyke Software. Originally a Windows product, VanDyke later added a Mac OS X version in 2010 with release v6.6 and a Linux version in 2011 with release v6.7. History Secur ...

, formerly CRT, a telnet client * .crt, X.509 Certificate filename extension

Social sciences

Cognitive reflection test The cognitive reflection test (CRT) is a task designed to measure a person's tendency to override an incorrect "gut" response and engage in further reflection to find a correct answer; however, the validity of the assessment as a measure of "cogni ...

, in psychology *

Critical race theory Critical race theory (CRT) is a cross-disciplinary examination, by social and civil-rights scholars and activists, of how laws, social and political movements, and media shape, and are shaped by, social conceptions of race and ethnicity. Goa ...

, an academic framework of analysis *

Current reality tree (theory of constraints) One of the thinking processes in the theory of constraints, a current reality tree (CRT) is a tool to analyze many systems or organizational problems at once. By identifying root causes common to most or all of the problems, a CRT can greatly aid ...

, in process management

Transport

* Canal & River Trust, England and Wales *

Changchun Rail Transit Changchun Rail Transit, is the rapid transit and light rail system in the city of Changchun, Jilin Province, China. Its first line, Line 3, is the first true light rail line in Mainland China. The system consists of three light rail lines a ...

, China *

Chongqing Rail Transit The Chongqing Rail Transit (branded as CRT; also known as Chongqing Metro) is the rapid transit system in the city of Chongqing, China. In operation since 2005, it serves the transportation needs of the city's main business and entertainment ...

, China * Connecticut River Transit, former bus service in Vermont, US * Former Cross River Tram project, London * CRT Group, transport company in Australia * Chicago Rapid Transit Company, former rail company

Other uses

* Canadian Railway Troops, WWI * Charitable remainder trust * Claiming Rule Teams, in motorcycle racing * Columbia River Treaty, Canada-US, 1960s * Connecticut Repertory Theatre, University of Connecticut * Correctional Emergency Response Team * An abbreviation for Crater (constellation) * Iyojwaʼja Chorote, a language in Salta province, Argentina, ISO 639 code {{disambiguation