Symptomchecker is an interactive diagnostic tool that you can personally influence by sharing
your knowledge about a health problem.

Three Steps
In two steps you'll soon have more clearness about your health problem. Make a third step and you are also helping fellow sufferers!

• Step 1 - What are your symptoms?
  Insert your symptoms as far as possible in the first part of the tool. Not able to fill all components? No problem! The system helps you to filter the results.
  By clicking on one of the seven checkmarks you can search and select topics.
• Step 2 - We search the most common advice
  Click on 'advice' to view the results. Isn't there any advice? Remove some less relevant topics from step 1 and click the button 'advice' again.
• Step 3 - Share your experience!
  Do you have more information about symptoms, health problem or treatment, to share with us? Click the 'Logging' button or press at the subject that suits your situation. This button ensures that your input will be used in a next search.
  
  

Review subject
Use the to add a note at the related subject to help fellowsufferers.

Images
By clicking on behind the subject, the image will be enlarged.

For further questions don't hesitate to contact us.

Based on the above input, a statistically weighted overview is presented below.

Tip! Press to change the subject.

A Positive Predictive value wil give you an indication of the chance that your symptom matches the result. This often is displayed as a PPV percentage.
Experience shows us that the percentages can be used as:

• 70-100% = Reliable
• 30-70% = Moderately reliable
• 0-30% = Not reliable

How to increase?

To increase reliability you can:

• Complete the symptom with more details eg (Belly pain after eating)
• Specify a 2nd symptom via "Add Symptom"

Note!
This value is related with your inserted symptoms. So this value can be different for "Cough" or "Dry cough". This behavior is inherent tot the mechanism that is used within this symptom checker.

How is it calculated?

PVW [%] = a / (a+b) * 100
a = Sortingvalue specific selection
b = Sum of sortingvalues of other related diseases in relation to your inserted symptom.

Calculation example: For calculating the PVW for the symptom "Headache" in the syndrome "Migraine":
a = "Headache -> Migraine" with a sortingvalue/weight factor of 10
b = Sum of the other relationships:
- "Headache -> Tired eyes" has a sortingvalue/weightfactor of 4
- "Headache -> tension headache" has a sortingvalue/weightfactor of 5
- "Headache -> Fibromyalgia" has a sortingvalue/weightfactor of 2

Calculation: PVW [%] = 10 / ((4 + 5 + 2) +10) * 100 = 47%

Sortingvalue/Weighing factor: The sortingvalue/weighing factor is a number that is calculated based on:
- The number of visitors who searched for this combination
- The number of visitors who "reported" this combination
- Calculated with the results of the national study

Read more about PPV....