Quantitative sensor testing (QST)
Quantitative sensor testing (QST): early diagnosis of nerve damage at NeiroMed clinic
Quantitative sensor testing (QST) is a state-of-the-art, non-invasive and precise method that allows you to assess the function of hand and foot peripheral nerve fine fibres (A-delta and C-fibres). This diagnostic method helps detect nerve damage at an early stage, even before it becomes irreversible or causes significant quality of life impairment.
Testing is particularly helpful in patients with sensory disorders, neuropathic pain or suspected diabetic neuropathy, allows evaluation of treatment effectiveness and control of disease dynamics.
What is a QST examination?
QST is an objective test that evaluates the accuracy and sensitivity of the patient’s skin nerve fibres, which are responsible for feelings of heat, cold and pain. During the test, gentle temperature stimulators are applied to the skin causing minor changes in heat or cold. When a patient senses a temperature change, they signal it to a specialist.
This method allows to evaluate:
- Whether the sensing function is saved,
- Whether there is damage to the fine nervous fibres,
- And whether that damage is symmetric, progressive or regressive.
Why choose this exam?
- Early diagnosis – a lesion may be detected even before it can be seen in classical neurological tests
- Objectively demonstrate impaired sensation, including where symptoms are unclear
- Evaluates treatment effectiveness – helps adjust treatment tactics
- Non-invasive and painless method — suitable for patients of different ages
- High sensitivity and accuracy compared to conventional neurological tests
When is quantitative sensor testing recommended?
This test is suitable for the diagnosis and evaluation of various neuropathic disorders, including:
- Diabetic neuropathy (especially in early stages)
- Pain or vague sensory disorders in hands or legs
- Neuropathy caused by malign tumours or their therapy
- Toxic neuropathies (e.g. after medication)
- Chronic neuropathic pain with no clear origin
- Sensory disorders following infections, trauma or autoimmune diseases
Duration of exam
About 30 minutes
Preparation
Not required
Feelings
The exam is non-invasive and painless, stimulation produces mild feelings of temperature.
Restrictions
None – suitable for patients with sensitive skin. The patient is in a state of rest during the examination. The specialist applies temperature stimulators in different places on his arms and legs. When a patient senses an impulse of heat or cold, they signal it, and the system records response time and pulse intensity.
Results
The results are analysed and evaluated under the guidance of a specialist who provides a conclusion within two working days.
Results and treatment options
The results shall be analysed and evaluated under the guidance of a specialist who shall give his or her opinion within two working days. After the exam:
- The specialist will explain what has been detected and provide a conclusion;
- Offer further additional examination if necessary;
- You can also use the conclusion for further treatment with another specialist.
What diseases can damage fine fibres?
The peripheral nerves of the arms and legs consist of fibres of different thicknesses. Fine fibres are particularly sensitive to changes in metabolism, toxicity and inflammation. They may be damaged by:
- Diabetes mellitus
- Malign tumours and treatment thereof (chemotherapy)
- Infectious diseases (HIV, Lyme disease, etc.)
- Vitamin B12 deficiency
- Thyroid diseases
- Autoimmune and inflammatory diseases
Early diagnosis enables targeted treatment to be initiated before irreversible changes occur.
Find out what lies behind your complaints – fast and secure! Quantitative sensor testing at the NeiroMed clinic – a diagnosis that can be trusted.