Fig. 1From: Pituitary thyrotoxicosis presenting as abnormal thyroid function testing during pregnancy: a case reportAberrant relationship between free T4 and thyroid-stimulating hormone postpartum in our patient (blue) versus estimates of normal relationship by formulas from Hadlow et al. [9] (red). Free T4 and TSH are given in pmol/L and mIU/L, respectively, to be able to calculate a normal curve based on previously derived formulas [9]Back to article page