I do not know if this is what you are talking about, but thought it might help.

AN is not well known. I am a teacher of the deaf with 10 years experience and had not heard of it. My son failed his initial ABR screen before his release from the hospital. He was 8 weeks premature. He had a second ABR and OAE test. The ABR was the same, but OAE's were present.
Some kids outgrow AN. I don't think my son is going to outgrow it. Hearing aids do not help kids with AN. WE are hoping for a cochlear implant soon.

Thanks for your input. Here's the thing: the baby has been solved. We got click ABR thresholds on him, and indeed, he's probably got about a flat 50 dB sensorineural hearing loss. Tympanograms with a 220 Hz probe tone have been coming up typically notched in newborns, but mobile, and in this baby, with the absent OAE, I just kept bringing him back for testing. Always, he would seem to respond to narrow band noise signals at 90 dB or so, and as he became a few months older, his NBN responses improved to 60-70 dB, however, his speech awareness thresholds started around 50 dB and never got any better. This causes me to wonder about our old Northern & Downs norms for catching neonates with moderate losses. In a neonate, 90 dB for warble tones, a 60 dB white noise startle, and speech awareness of 50 dB would be a pass, but it seems that a neonate with a 40-50 dB SN loss is also going to pass at those levels (at least this baby did). He is now 6 months old and responds to warble tones at 60 dB (norms 50 dB) and speech at 50 dB (norms 20 dB). The thing that made me keep bringing him back was the absent OAE's, and of course, I'm glad I did, or I would have missed him. Which brings up another good question: ABR testing is a problem for me, in that I am in an audiology private practice with no medical help on the premises, and I am very reluctant to sedate a baby without a doctor around. I have talked to other audiologists, and this seems to be the consensus, that no one wants to take on the liability of sedation without medical backup. Some audiologists have casual arrangements with physicians to do very occasional ABR testing in the doc's office, but no one around here does many babies, so I'm trying to come up with something workable for the number of babies I'm seeing. What I'm wondering is this: is there a CPT code that a physician can use for sedation of a child in the office? That could work out well, if the baby could show up at the doc's office, be put to sleep by the nurse, we do the test (our Cadwell system is quite portable) and the doctor is somehow compensated for use of office, staff, and liability.

And back to the other kid I was talking about, he's 4 years, easily testable, normal tympanograms, normal hearing and absent OAE's. So far, all I have is an OAE screener, so in fairness, I would probably have done better with a full clinical unit with TOAE and DPOAE, but I still wonder about the possibility of absent OAE's in otherwise normal hearing, normal middle ear kids. We'll see.