Which of the following is NOT an acoustic immittance measure?

The correct choice identifies that OAEs, or otoacoustic emissions, are not an acoustic immittance measure. Acoustic immittance measures are assessments related to the movement of the eardrum and the conductive system of the middle ear, often reflecting changes in pressure and compliance. These measures include tympanometry, which evaluates the mobility of the tympanic membrane and the pressure within the middle ear, as well as acoustic reflex testing, which assesses the involuntary muscle contractions in response to loud sounds, indicating the functioning of the auditory pathway.

Furthermore, static acoustic impedance is a specific part of the tympanometric assessment that quantifies how much sound energy is absorbed by the middle ear system at a specific pressure. In contrast, OAEs are generated by the outer hair cells of the cochlea and are used primarily to assess cochlear function, rather than the mechanical properties of the middle ear. Therefore, recognizing that OAEs do not fit within the category of acoustic immittance measures helps clarify their role in audiologic assessment compared to the other options listed.