===== Non-invasive =====

**Non-invasive** refers to any medical or diagnostic procedure that does '''not involve penetration of the body''' or insertion of instruments through the skin or into body cavities.

==== Characteristics ====
  * No incision or puncture of the skin
  * No insertion into internal organs
  * Minimal physical risk or discomfort

==== Examples ====
  * Magnetic Resonance Imaging (**MRI**)
  * **Ultrasound**
  * **Electroencephalography (EEG)**
  * Non-invasive blood pressure monitoring
  * Transcranial Doppler ultrasound

==== Comparison ====
^ Term ^ Description ^
| '''Non-invasive''' | External procedure, no body entry |
| '''Minimally invasive''' | Small incisions or limited body access (e.g., laparoscopy) |
| '''Invasive''' | Direct entry into body or organs (e.g., open surgery, catheterization) |