My 12 year old ds has had intermittent loose stools and urgency since he was a baby. Every month or so he has an afternoon of rushing to the loo repeatedly. The rest of the time he tends to splatter the bowl (sorry tmi) and have urgency. As a baby his poop was never sausages or Play-Doh consistency like my other kids, but more like porridge. Often there was lots of mucus. I went to the doctor with him and he was tested twice for coeliac at about 2 ish and about 5 ish, but nothing was found. He is well grown. We use lactose free milk as we find it suits him better and seems to reduce his belly pain, but it doesn't solve the issue completely.
18 months ago he was diagnosed with an autoimmune blood condition called itp. This is low platelets as the spleen starts attacking them. Most children resolve spontaneously within 6 weeks; ds' did resolve but it took a year. He has just had a follow up test and his platelets are ok but they have now found his bloods looking at liver function show that his liver is probably stealing calcium from his bones and so they think he has low vitamin D, though he does take a multivitamin. He also, of my 4 kids, was the only one who has terribly soft teeth which have lots if cavities. None if his 3 sibs have any and he has multiple including in adult teeth within 2 years of coming through. He eats no more sweets than his sibs and we no longer buy fruit juice. He hates fizzy drinks.
Adding it all up I have asked the doctor if they will do another coeliac test, they said yes but I am worried the bloods will be negative again. Is there a particular test I should ask for?
For context 4 members of my family are diagnosed coeliac - my sibling, my cousin, a different cousin on same side's 2 children. My dad thinks he is coeliac too but never been tested. Lots of hypothyroid as well.