Final answer:
Radiology is the major group of LOINC content related to medical diagnostics. Medical imaging techniques use ionizing radiation to diagnose and treat diseases, with lower radiation doses compared to therapeutic uses.
Step-by-step explanation:
The major group of LOINC content related to medical diagnostics is Radiology. Radiology is the branch of medicine that uses medical imaging techniques, such as X-rays, CT scans, and MRI scans, to diagnose and treat diseases. These techniques use different forms of ionizing radiation, but the radiation dose is generally lower compared to therapeutic uses of ionizing radiation, which are used to treat diseases like cancer.