Medical Diagnosis - Indication For Diagnostic Procedure

Indication For Diagnostic Procedure

The initial task is to detect a medical indication to perform a diagnostic procedure. Indications include:

• Detection of any deviation from what is known to be normal, such as can be described in terms of, for example, anatomy (the structure of the human body), physiology (how the body works), pathology (what can go wrong with the anatomy and physiology), psychology (thought and behavior) and human homeostasis (regarding mechanisms to keep body systems in balance). Knowledge of what is normal and measuring of the patient's current condition against those norms can assist in determining the patient's particular departure from homeostasis and the degree of departure, which in turn can assist in quantifying the indication for further diagnostic processing.
• A complaint expressed by a patient.
• The fact that a patient has sought a diagnostician can itself be an indication to perform a diagnostic procedure. Therefore, in, for example, a doctor's visit, the physician may already start performing a diagnostic procedure by, for example, watching the gait of the patient from the waiting room to the doctor's office even before she or he has started to present any complaints.

Even during an already ongoing diagnostic procedure, there can be an indication to perform another, separate, diagnostic procedure for another, potentially concomitant, disease or condition. This may occur as a result of an incidental finding of a sign unrelated to the parameter of interest, such as can occur in comprehensive tests such as radiological studies like magnetic resonance imaging or blood test panels that also include blood tests that are not relevant for the ongoing diagnosis.