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.
Use a hearing aid If tinnitus is due to loss of hearing, a hearing aid can sometimes help. It is important to use an aid that does not block the ear canal. Modern fine tubing, open fit behind the ear aids are unobtrusive and more comfortable to wear than in-the-canal aids.