Science and Education Publishing American Journal of Medical Case Reports 2 11 2014 11 11 Clinical Application of the Levothyroxine Absorption Test in the Diagnosis of Pseudo-Malabsorption 253 255 EN Muhammad Imran Butt Nidhi Gupta Hiang Leng Tan Department of Diabetes and Endocrinology, Weston General Hospital, Weston-super-Mare, UK Najeeb Waheed AJMCR20142118 10.12691/ajmcr-2-11-8 2014 10 20 2014 11 05 2014 11 11 We present a variation and clinical application of the Levothyroxine Absorption Test (LAT) in the identification of pseudo-malabsorption of levothyroxine in uncontrolled hypothyroidism, for which there is no current gold standard protocol, and a variety of methods proposed in the literature. The LAT was conducted over 5-days with thyroid function tests conducted pre-LAT, then at day 1 and 5. The thyroid stimulating hormone levels became completely suppressed indicating that there had been previous non-compliance with medication.