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Table 2 TSH dilution test in the 59-year old female patient on 88 μg of L-T 4 daily

From: Case report: When measured free T4 and free T3 may be misleading. Interference with free thyroid hormones measurements on Roche® and Siemens® platforms

Dilution

TSH

FT 4

FT 3

Reference Range

none

4.37

6.61

5.57

TSH 0.27-4.2 μIU/ml (Roche®)

    

FT4 0.93-1.7 ng/ml (Roche®)

    

FT3 2.6-4.4 pg/ml (Roche®)

1:5

0.885

-

-

 

Calculated TSH

5 x 0.885=4.42 (101.1% recovery)

-

-

 
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Thyroid Research

ISSN: 1756-6614