Related Experiment Video
Updated: Aug 9, 2026
12:17
The 4-vessel Sampling Approach to Integrative Studies of Human Placental Physiology In Vivo
Published on: August 2, 2017
Summary
Early pregnancy loss, termed occult pregnancy, can be detected through elevated luteinizing hormone levels. This finding suggests a pregnancy occurred even with a normal menstrual period following.
Area of Science:
- Reproductive Endocrinology
- Early Pregnancy Detection
Background:
- Occult pregnancy is defined as a pregnancy aborting so early that no clinical suspicion arises.
- Diagnosis is challenging due to minimal or absent symptoms, often presenting as a slight menstrual delay.
Purpose of the Study:
- To investigate the incidence of occult pregnancy in Clomid-induced ovulatory cycles.
- To determine if hormonal markers can indicate these early, unsuspected pregnancies.
Main Methods:
- Studied 16 Clomid-induced ovulatory cycles with biphasic temperature charts and hyperthermic phases ≥ 12 days.
- Measured serum luteinizing hormone (LH) values in the late luteal phase.
- Assessed LH values for elevation indicating cross-reactivity with human chorionic gonadotropin (hCG).
Main Results:
- Six out of 16 cycles (37.5%) showed significantly elevated LH levels (>3 standard deviations).
- These elevated LH levels suggest cross-reactivity with hCG, indicating an occult pregnancy.
- All participants experienced clinically normal menstrual periods 12 hours to 6 days later.
Conclusions:
- Elevated LH levels in the late luteal phase can serve as an indicator of occult pregnancy.
- This hormonal marker allows for the detection of pregnancies that would otherwise go unnoticed.
- Further research is needed to explore the clinical significance and management of these early pregnancy losses.
