Complete blood count with differential, platelet count
ESR, C-reactive protein
Amylase, lipase
Comprehensive metabolic panel (including liver function tests)
Prealbumin
Thyroid fuction tests (T4, TSH)
Serum IgA, tissue transglutaminase IgA, IgG, deamidated antigliadin IgG, and IgA
UGI alone or UGI with small bowel follow through
Upper endoscopy with biopsy
Abdominal ultrasound
Urinalysis, +/− toxicology screen if indicated, pregnancy test in adolescent females if indicated
Growth charts (over previous 2–3 years), BMI
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