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Diagnosis Results

Diagnosis results are filtered based on the findings indicated by the user and shown in the Diagnosis results tab.

Diagnosis Results tab listing statistically probable diseases

Differential Diagnosis

This is the differential diagnosis of infectious diseases compatible with clinical data that you’ve entered. A sample screen appears above. Diagnoses are arranged in descending order of statistical likelihood, with probability figures depicted on the adjacent bar graph.

The First Case scenario diseases list appears as another list. These are diseases that match the symptoms of the disease, but not the country; ie, this might be the first case of the disease in that country.

The Diagnosis Results window comprises of:

  • Disease: Lists all diseases filtered by the GIDEON database to meet the selected criteria.
    Click disease for disease information.
    Click heading to sort disease list alphabetically.
  • Probability: Displays the statistical likelihood based on published or estimated disease incidence and the prior-probability for each of the symptoms chosen.
    Click heading to sort disease list by probability.
  • indicates potential bioterror disease
  • indicates note exists for country
  • Compare checkboxes: Check boxes next to the listed disease to generate a disease comparison chart.
  • Save Save case. (Only available in individual subscription)
  • Open Open case. (Only available in individual subscription)


Compares selected diagnoses from the Diagnosis Results.

Users are often unaware of additional signs and symptoms that might shorten and focus on the differential diagnosis list.

Method to add diseases to the comparison table

Compare displays a table of additional symptoms or signs which distinguish between the compared diseases. This list is optimized and ranked, with the most useful signs and symptoms at the top of the list. Optimization is useful in saving time, cost, and effort.

Disease comparison table to aid diagnosis

The comparison comprises two or more columns, depending on the number of diseases being compared. See image above. The left column lists the signs and symptoms. The columns to the right display the names of each disease.

The legend in the lower right corner explains the signs used in the graphic presentation:

  • The signs + or indicate that a clinical finding occurs in more than 80% or less than 20%, respectively, of patients with a given disease.
  • V denotes symptoms that occur in between 20% and 80% of cases (variable percentages).

Why Not

Why not button explains why given diseases are not included in the Diagnosis results list.

Occasionally the differential diagnosis list does not include a disease that you would have considered. The Why Not window displayed below, lets you ask why a certain disease isn’t on the list.

Why Not accesses a list of all diseases included in GIDEON’s database. The lower box is a list of positive and/or negative clinical findings that you entered but was not compatible with the diagnosis indicated. GIDEON also indicates when the disease is not endemic to the country chosen.

Why Not feature: Diseases not shown in Diagnosis Results

Why Not incorporates two elements:

  • Diseases not shown in Diagnosis Results: lists diseases GIDEON determines do not meet the criteria specified in making a diagnosis.
  • (The disease) did not appear because you marked: After selecting a disease in the list, this window displays the criteria that eliminated the selected disease from consideration.


In some instances, “overlapping” diagnoses may appear, e.g., both “Enterovirus infection” and “Meningitis – Aseptic (viral)” in a patient with lymphocytic meningitis…or “Listeriosis” and “Septicemia-bacterial” (the latter including Listeria septicemia).

Diagnostic specificity is improved by entering as many positive and negative clinical findings as possible.