Optional medical device diagnostics – depending on the results of the history, physical examination, laboratory diagnostics, and obligatory medical device diagnostics – for differential diagnostic clarification.
- Encephalogram (EEG; recording of the electrical activity of the brain) – for suspected brain organic disorders.
- Electrocardiogram (ECG; recording of the electrical activity of the heart muscle) – to exclude cardiac arrhythmias.
- Thyroid sonography (ultrasound examination of the thyroid gland) – as a basic examination to determine the size of the thyroid gland and thyroid volume, as well as any structural changes such as nodules; if necessary, with fine needle biopsy.
- Thyroid scintigraphy – imaging method using radioactive substances to exclude thyroid dysfunction in the case of insufficient confirmation by thyroid sonography.
- Magnetic resonance imaging (MRI; computer-assisted cross-sectional imaging method (using magnetic fields, i.e. without X-rays)); allows a very good assessment of the organs; for suspected brain tumors or inflammatory changes of the brain.
- Polysomnography (sleep laboratory; measurement of various bodily functions during sleep, which provide information about sleep quality) – if sleep apnea is suspected.
