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.
How to put on a hearing aid. Putting on your hearing aid is easy - it only takes 20 seconds! Place the hearing aid behind the ear, so that the earwire rests comfortably on the ear, close to your head. Insert the ear-tip into the ear canal while holding the lower part of the earwire. Run your finger along the wire to confirm that the hearing aid fits properly.