Hearing aids are rated according to criteria such as features, comfort and functionality, says Consumer Reports. Collecting and comparing information from user surveys and evaluating various aspects of performance is an ... More »

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Hearing aids that are highly rated by consumers include those from Miracle-Ear, Zounds and Oticon, all receiving a consumer rating of 3 out of five stars or higher, reports ConsumerAffairs. Miracle-Ear and Zounds receive... More »

Reviews on hearing aid batteries can be found at Walgreens.com, Walmart.com and the P&G Everyday website. Reviews at Walgreens.com include customer ratings of one to five stars for aspects such as quality and value. More »

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The rheumatoid factor test aids in diagnosing rheumatoid arthritis, also known as RA, says WebMD. The rheumatoid factor is an antibody present in the blood in a majority of people diagnosed with RA. More »

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A VNG, or videonystagmography, medical test refers to a set of technologies used in testing the inner ear and the functionality of central motor functions, according to the National Dizzy and Balance Center. VNG testing ... More »

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A doctor orders an esophageal manometry test to determine the functionality of the esophagus, according to Mayo Clinic. The test measures rhythmic muscle contractions during swallowing. It also measures the coordination ... More »

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A nuclear thyroid scan utilizes nuclear medicine imaging to determine the functionality of the thyroid, according to Healthline. After taking a radionuclide pill or liquid, the doctor takes pictures of the patient's thyr... More »

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