Is Macrilen (macimorelin Dx) still available in the US for diagnosis of adult growth hormone deficiency (AGHD)?   

No, it is not. The rights for Macrilen were returned from Novonordisk to Areterna Zentaris almost 1 year ago (May 2023), and as of now, no company is selling it. Although they communicated an anticipated re-launch with an alternate commercialization partner, I am not aware that that was accomplished...