"A real medical indication." This is anecdotal, but I just told my doctor (GP) my symptoms, that I am vegan and hence don't eat milk products. I was also on quitting smoking. Got a reference for blood test and smoking cessation (Zyban). I don't remember if smoking cessation was insured, but the rest all was. Going to your GP is free (via mandatory insurance) in The Netherlands. I got my vitamin D and B12 checked among other things.