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.
If you're on a low income or have complex needs, you may be eligible for higher funding. If you meet these criteria, the Ministry of Health will pay the wholesale cost of your hearing aid. The clinic must tell you the wholesale price of the aid and provide an itemised list of any additional charges you have to pay.