Fig. 1From: Adequate timing and constant supervision are the keys for successful implementation of levothyroxine or levothyroxine/paracetamol absorption testResults of combined levothyroxine (1000 μg) and paracetamol (1000 mg) oral absorption test in a female patient with suspected levothyroxine malabsorption about 2 years prior to admission to our Department. Darker area represents reference range for free T4 (11.5–22.7 pmol/l)Back to article page