The Vel weak phenotype is due to a heterozygous deletion in the same exon, resulting one functional copy of the SMIM1 gene. If a patient who is Vel negative is transfused with Vel positive red blood cells, they may form anti-Vel alloantibodies.
Hearing aids need to be fitted by someone trained specifically in hearing problems. An audiologist or licensed hearing aid provider can make sure your hearing aids fit and work for your type and degree of hearing loss. You also need to consider cost.
hearing aid an instrument to amplify sounds for those with hearing loss. There are two types of electronic hearing aids: the air-conduction type, which is worn in the external acoustic meatus, and the bone-conduction type, which is worn in back of the ear over the mastoid process.