Table 2. Common Causes of Anovulation and Accompanying
Laboratory Patterns
Functional
hypothalamic
anovulation
Ovarian
insufficiency
Menopause PCOS
Nonclassical
CAH
Hyperpro-
lactinemia
LH
(IU/L)
<10 >15 <15 <15 <10
FSH
(IU/L)
<10 >15 <10 <10 <10
LH/FSH
~1 LH < FSH LH >
FSH
LH > FSH LH < FSH
E2
(pg/mL)
<50 <50 <50 <50 <50
P4
(ng/mL)
<1 <1 <1 ≤1 <1
AMH
(ng/mL)
>1 <0.5
nl or ↑
nl nl
PRL
(ng/mL)
Low nl nl High nl nl
↑
TSH
(mU/mL)
Low nl
nl or ↑
nl nl
nl or ↑
T4
(mg/dL)
Low nl
nl or ↓
nl nl nl
DHEA-S
(μg/dL)
nl nl High nl High nl
nl or slight ↑
17-OHP
(ng/dL)
nl nl nl
↑
nl
T
(ng/dL)
Low nl Low nl High nl
or slight
↑
↑
nl