Overview: Luteinizing Hormone TestIntroduction: The Luteinizing Hormone Test measures LH to assess fertility or pituitary disorders, causing infertility or irregular periods. Aligned with 2023 ASRM guidelines, it uses immunoassay for high specificity, supporting reproductive screening. This test is critical for guiding diagnosis, treatment planning, and improving outcomes in endocrinology for patients with suspected reproductive or pituitary issues.
Other Names: LH Assay, Pituitary Function Test.
FDA Status: Laboratory-developed test (LDT), meeting endocrinology standards for diagnostic accuracy.
Historical Milestone: LH testing began in the 1960s with fertility research. Immunoassay methods improved in the 2000s, enhancing diagnostic precision.
Purpose: Measures LH to assess fertility or pituitary disorders, guides treatment, and evaluates patients with infertility or irregular periods.
Test Parameters: 1. Luteinizing Hormone
Pretest Condition: Fasting 10-12 hours required. Collect serum or plasma. Report history of infertility, irregular periods, or pituitary symptoms.
Specimen: Serum (SST, 2-5 mL), Plasma (EDTA, 2-4 mL). Transport in a biohazard container.
Sample Stability at Room Temperature: 8 hours
Sample Stability at Refrigeration: 7 days
Sample Stability at Frozen: 6 months
Medical History: Document infertility, irregular periods, pituitary symptoms, or family history of reproductive disorders. Include current medications, especially fertility drugs.
Consent: Written consent required, detailing the tests purpose, fertility implications, and risks of blood collection.
Procedural Considerations: Uses immunoassay to measure LH in serum or plasma. Results are available in 1-2 days, supporting rapid clinical decisions. Performed in laboratories, often for fertility or pituitary assessment.
Factors Affecting Result Accuracy: Hemolysis, lipemia, or improper sample storage can affect results. Non-fasting samples may reduce accuracy.
Clinical Significance: Abnormal LH levels suggest pituitary dysfunction or infertility, guiding hormone therapy or fertility treatment. Normal levels may require further testing.
Specialist Consultation: Consult a reproductive endocrinologist for result interpretation and treatment planning.
Additional Supporting Tests: FSH, estradiol, or pituitary MRI to assess fertility or pituitary disorders.
Test Limitations: LH levels vary with menstrual cycle or time of day; clinical correlation is needed. Not specific to one condition.
References: ASRM Fertility Guidelines, 2023; Journal of Clinical Endocrinology, Welt CK, 2022.
