Objective: To present a case of abnormally trending hCG levels due to ovarian hyperstimulation syndrome (OHSS) and to portray the obscurities of this commonly used method for tracking early pregnancies.
Design: Case report.
Setting: Outpatient ART facility.
Patient: A patient who received controlled ovarian hyperstimulation in an ART cycle.
Intervention: Supportive care.
Main outcome measure: hCG level.
Result: The hCG levels in this patient with OHSS trended in an abnormal fashion, suggesting a failing or ectopic pregnancy, but the patient had a normal intrauterine fetus.
Conclusion: hCG levels may be falsely low in pregnancies complicated by OHSS.
Keywords: Abnormal trend; Early pregnancy; OHSS; hCG.