Investigating Thyroid Function

Why focus on thyroid function tests? Investigating Thyroid Function
When to test?
Screening patients at increased risk / asymptomatic patients
Which test should be used?
Limitations of thyroid function tests
Monitoring
Thyroid tests in the pregnant patient
Sick euthyroid syndrome
Thyroid cancer
The effects of drugs on thyroid function
GP and laboratory communication
Range of tests available
Thyroid function
References
See also TSH vs FT4: Reminder May 2007

GP and laboratory communication

To provide a better outcome for the patient it is important there is open and clear communication between the GP and the laboratory. It is important the laboratory is aware of the following:

  • The clinical indication for testing (are you suspicious of thyroid dysfunction, or are you monitoring drug treatment)
 
  • Any relevant drug treatments the patient may be taking (e.g. thyroxine, carbimazole), including the dose and any changes in dose and the length of therapy.

Providing the laboratory with as much clinical information as possible allows the laboratory to provide a better service. Reflex tests can be added more appropriately, and abnormal or unexpected results can be investigated and interpreted more effectively.


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