Suggested protocol for the aetiological investigation of childhood deafness
| Audiology |
|---|
| • Age appropriate, reliable audiological assessment, including tympanometry |
| →child/proband |
| →parents & sibs (if any clinical suspicion of hearing loss) |
| Urine analysis |
| • CMV (first 2–3 weeks only) |
| • Glucose |
| • Microscopy |
| • Organic and amino acids |
| Blood |
| • Viral serology |
| ⇒rubella (first six months only) |
| ⇒toxoplasma |
| ⇒syphilis |
| • DNA storage |
| • Cytogenetic analysis |
| • T4 & TSH |
| ECG |
| Ophthalmological assessment |
| • ERG |
| CT/MRI |
| Vestibular function testing |
| Perchlorate discharge test |
| Renal ultrasound scan |