Final answer:
The abbreviation Dx in the medical field means 'diagnosis', used to identify a disease or condition.
Step-by-step explanation:
The abbreviation Dx stands for 'diagnosis'. This term is widely used in the medical field to refer to the identification of a disease or condition based on its signs, symptoms, and from the results of various diagnostic procedures. It is fundamental in determining the appropriate treatment plan for a patient. For example, a doctor may use the term Dx to note down the diagnosed condition of a patient in their medical records.