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Table 1 Thyroid Function Tests & Endocrine Treatment

From: A remarkable case of thyrotoxicosis initially caused by graves’ disease followed by a probable TSHoma – a case report

Date

Endocrine Treatment

Free T4

(7.0–16.0 pmol/L)

TSH

(0.5–4.2 mU/L)

July 2011

CBZ commenced

20.4

< 0.02

November 2011

CBZ 5 mg/day

9.9

3.11

November 2012

CBZ 5 mg/day

14.6

1.65

January 2013

CBZ discontinued

  

March 2013

nil

17.7

0.82

May 2013

nil

20.4

0.63

July 2014

nil

21.5

0.67

October 2015

nil

20.1

0.77

  1. Serial thyroid function tests prior to, during, and following discontinuation of antithyroid drug therapy
  2. Key: CBZ carbimazole, T4 thyroxine, TSH thyroid stimulating hormone