[She lifted one hand, a small ball of green energy emitting from her palm. It brightened like a lamp just beginning to warm up, before fading away into a more solid green form: a doctor's stethoscope.]

I believe the colloquial phrase would be: the old fashioned way

[Once the stethoscope had faded into a shade of green mirroring her own skin, she passed it over to Don. He would find it to work precisely as an Earth stethoscope would, right down to the increased sensitivity of any and all sounds around him.]

I will scan your heartbeat and then use my systems to recreate its frequency to the best of my capabilities. It will be your job to tell me if it matches with what you hear.