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Table 3 Results of thyroid function tests in the 59-year old female patient during L-T 4 withdrawal

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

Date

TSH

FT 4

FT 3

Ferritin

SHBG

Reference Ranges

14.06.2012#

5.14

4.59

4.98

79.9

 

TSH 0.27-4.2 μIU/ml (Roche®)

      

FT4 0.93-1.7 ng/ml (Roche®)

      

FT3 2.6-4.4 pg/ml (Roche®)

14.06.2012

not repeated: Roche® platform

1.08*

3.70*

 

79.5

*Abbott® Architect I 1000SR

      

FT4: 0.7-1.48 ng/dl

      

FT3: 1.71-3.71 pg/ml

15.06.2012

6.5

4.5

4.97

  

Ferritin: 5–148 ng/ml

16.06.2012

9.49

3.48

4.82

  

SHBG: 18.8-115.2 nmol/l

18.06.2012

11.01

3.41

4.74

81.00

  

18.06.2012##

not repeated: Roche® platform

1.00*

3.38*

 

69.5

*Abbott® Architect I 1000SR

      

FT4: 0.7-1.48 ng/dl

      

FT3: 1.71-3.71 pg/ml

19.06.2012

9.53

3.57

4.74

   
  1. # L-T4 stopped on this day.
  2. ## 300 μg of L-T4 administered after blood test on 18.06.2012.