Physiology, Laboratory Testing, and Iodine
8
Recommendations Table 2. Indications for Thyroid Function
Testing
Pregnancy Strength
*
Level
#
All newly pregnant women should undergo clinical
evaluation and assessment for risk factors
a
for thyroid
dysfunction in pregnancy.
Good Practice Statement
In women without known thyroid disease, it is suggested
that TSH testing be offered upon a positive pregnancy test
to those at increased risk of thyroid dysfunction during
pregnancy.
a
Conditional Moderate
In women treated with levothyroxine, TSH testing may be
performed upon pregnancy confirmation, approximately every
4 weeks during the first half of pregnancy, at least once in the
third trimester, and 4–6 weeks aer any dose adjustment.
Conditional Moderate
Postpartum Strength
*
Level
#
Apply the same thyroid function testing indications to
postpartum women as those for the general non-pregnant
population. Specifically for women using levothyroxine,
thyroid function testing should be performed around 6 weeks
postpartum or following any levothyroxine dose adjustment.
Good Practice Statement
For recommendations preconception (including fertility treatments), see Dysfunction and Infertility.
a
As defined in Table 1.
* Strength of Recommendation;
#
Level of Evidence; Good Practice Statement.
