Programmed for your hearing
RNID explains that hearing aids are specially programmed to match the results of your hearing test. The NHS says that when your hearing aid is ready it will be programmed to suit your level of hearing loss, you will be shown how to use and look after it, and another appointment will be arranged a few weeks later to check how things are going.
Real-ear measurement (REM)
Real-ear measurement checks what your hearing aid is actually doing inside your ear canal. A thin, soft tube with a tiny microphone is placed in your ear while the hearing aid plays sounds, so the audiologist can compare the result to a target for your hearing.
The British Society of Audiology calls this the most direct way of verifying a hearing aid fitting. Your ears are examined first, and the BSA says it should not be done if there is pain or discharge. The BSA adds that these measurements are a good starting point but should not stop further adjustment based on your feedback and the audiologist's judgement.
Fine-tuning and follow-ups
Fitting is not a one-off. After you have worn your hearing aids in everyday life, your feedback helps the audiologist adjust them. See your first weeks and aftercare.
Hearing aids vs amplifiers (PSAPs) and over-the-counter aids
- Personal sound amplifiers (PSAPs) – the US FDA describes these as products to make sounds louder in certain situations for people with normal hearing. They are not hearing aids and are not meant to treat hearing loss.
- Over-the-counter (OTC) hearing aids – in the USA, the FDA allows these for adults aged 18+ with perceived mild to moderate hearing loss only. The FDA says they are not for severe or profound hearing loss, and anyone who suspects a more severe loss should see a licensed hearing professional.
- UK rules differ; the FDA categories above apply in the USA.
Ask the clinic
Questions about your own hearing? Ask us at your next appointment.
Sources
- BSA: Verification of hearing devices using probe microphone measurements (2018)
- NHS: Hearing aids and implants
- RNID: Understanding hearing loss and hearing aids
- FDA: Other hearing devices and products (PSAPs)
- FDA: OTC hearing aids – what you should know
Checked October 2026. If anything here differs from what your clinician tells you, follow your clinician.