Effects of Home Gluten Immunogenic Peptide Testing on Children With Celiac Disease

Following a gluten-free diet is difficult. Eating small amounts of gluten may be common.
Gluten may cause a wide range of symptoms, or no symptoms at all. Thus, there is not always a
'feedback loop' to alert to accidental gluten exposure. Nevertheless, these "silent" gluten
exposures may interfere with recovery and healing of the intestine. New tools are available
to test for fragments of gluten - Gluten Immunogenic Peptides (GIPs) in urine and stool.

The goal of this research study is to evaluate how knowledge of gluten-immunogenic peptide
(GIP) levels in urine and stool affects subsequent adherence to a gluten-free diet.
Participants will be children with celiac disease recruited at Boston Children's Hospital.
All participants will undergo a diet assessment by a dietitian at the beginning and end of
the study. At random intervals, participants will be prompted to collect their next urine and
stool and complete a survey related to symptoms and diet adherence. Half of the participants
will store the sample to be tested later and the rest of the participants will be provided
with devices to test their urine and stool at home to receive immediate results. GIP test
results will be compared to other measures of celiac disease and gluten-free diet adherence,
including antibody tests. These findings will help to determine how these new tools can be
used to improve gluten-free diet adherence and symptoms and the effect on quality of life.

Inclusion Criteria:

- Age 6 to 18 years at study entry

- Diagnosis of celiac disease based upon either

1. Biopsy criteria i) Marsh 3 lesion and/or villous height:crypt depth ratio (Vh:Cd)
< 3 with intraepithelial lymphocytosis; and ii) Elevated serum tTG IgA and/or EMA
antibodies

2. Serologic/genetic (ESPGHAN 2012) criteria i) Symptoms compatible with celiac
disease; ii) Serum tTG IgA > 10 x upper limit of normal for assay; iii) EMA titre
elevated on a separate sample; and iv) HLADQ genotype compatible with celiac
disease.

- Adherence to a gluten-restricted diet (self-reported) for 6 months or more

- Attending a clinician assessment for celiac disease at Boston Children's Hospital

Exclusion Criteria:

- Unable to provide urine and/or stool sample or attend study visits

- English proficiency unsuitable for completion of surveys

- Anuria or oliguria

- Reliance upon commercial gluten-free formulas as primary source of nutrition

- Comorbid condition that in the opinion of the investigator would interfere with the
subject's participation in the study or would confound the results of the study