If you have the money to spend I'd recommend a fecal to rule out any problems; I'd ask first though to see what method they use
if they just do simple floatations I wouldn't waste my time, as hey tend to not show the parasites very well. Try to get them to do a centrifugation or a sedimentation, as they are the more accurate methods.
if you could let me know how your vet responds to the questions too, that would be great
Well being I didn't know this I'll have to ask what my local one does. I know they said something about putting it under a microscope. So which way is the best?