Where appropriate, Harald Gaier as a naturopathic clinician, refers patients for recognised standard laboratory tests.

These include ultrasound scans, electrocardiograms (ECGs), x-rays, blood, sputum, sweat, breath, and urine tests, as well as various audiology tests.

More complex tests include computerised tomography, magnetic resonance imagery, computerised axial tomography, positron-emission tomography, and electro-encephalography.