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.
Typical costs: 1  A hearing test is required before purchasing a hearing aid. 2  Patients also need a hearing aid selection appointment, which can be free with purchase or cost up to $250, depending upon the clinic. 3  There are several different types of hearing aids.