The 3rd character refers to the root operation or the objective of the procedure.

Fetus and Obstetrical

  • BY3 - Magnetic Resonance Imaging (MRI)

    Computer reformatted digital display of multiplanar images developed from the capture of radiofrequency signals emitted by nuclei in a body site excited within a magnetic field

  • BY4 - Ultrasonography

    Real time display of images of anatomy or flow information developed from the capture of reflected and attenuated high frequency sound waves