"How long does a biopsy result take?"

For months it is strongly suspected my son has coeliac disease. After waiting 3 weeks for blood test results, 12 weeks for a consultation then a further 4 weeks for a biopsy, we are still waiting for the result another 4 weeks down the line. I was informed if there had been no word in 3 weeks to call the GP. I did and they had the same results I had been given on the day - no biopsy result. I realise waiting lists exist and the condition is not life threatening but my son is 14. He is missing out on school too often and in general the quality of life as he is not well enough most days to participate fully in "normal" day to day activity. Did I mention his ill health has been affecting him since two years and from August 2012 it took 10 months to get to the right tests being done at all. How long does a biopsy result take?