It would be good if there was more clarity on whether the test was repeated on the same specimen  or on another specimen collected from the same patient at a different time.<p>If it is the latter, case marked variations could have a number of explanations, ranging from the inevitable inaccuracy of finger prick collection, through errors due to dilution by Theranos, problems with the technology and equipment and diurnal variation of TSH levels<p>See also Diurnal variation in TSH and free thyroid hormones in patients on thyroxine replacement. <a href="http:&#x2F;&#x2F;www.ncbi.nlm.nih.gov&#x2F;pubmed&#x2F;2588938" rel="nofollow">http:&#x2F;&#x2F;www.ncbi.nlm.nih.gov&#x2F;pubmed&#x2F;2588938</a>