3
Figure 1. Testing For Thyroid Dysfunction In Pregnancy
TSH <2.5
th
percentile or
<0.1 mU/L
TSH
0.1–2.5 mU/L
TSH
2.5–10 mU/L
TSH
>10mU/L
In HIGH RISK women, check TSH as
soon as pregnancy confirmed, with reflex
TPOAb if TSH is 2.5–10 mU/L
See
Thyrotoxicosis
section
No further
workup
Treat with LT4
TPOAb
positive
TPOAb
negative
TSH
2.5 mU/L–ULRR
TSH
ULRR–10 mU/L
TSH
2.5 mU/L–ULRR
TSH
ULRR–10mU/L
Consider
treatment
with LT4
Treat with
LT4
No treatment
Consider
treatment
with LT4
LT4, levothyroxine; TPOAb, autoantibodies to thyroid peroxidase; TSH, thyrotropin;
ULRR, upper limit of the reference range
(See Table 4 in the full text guideline: Alexander EK et al. yroid. 2017 Jan 6. doi:
10.1089/thy.2016.0457:149.)
