January 19, 2026
Egg Quantity vs. Quality: Key Factors in Fertility
Egg quantity (ovarian reserve) is measured through tests like FSH and AMH levels, while egg quality declines with age. At 25, 75% of eggs are genetically normal, dropping to 10-15% by age 40.
Key Takeaways
How Ovarian Reserve Testing Works (Ultrasound & Blood Tests)
Ovarian reserve is assessed via ultrasound (to count antral follicles) and blood tests on day 3 of the menstrual cycle, measuring FSH and AMH levels. These tests provide insights into remaining egg supply and potential treatment responses.
Interpreting AMH and FSH Levels for Fertility Treatment
High AMH (>3.5 ng/mL) predicts a strong response to fertility medications, while low AMH (<1 ng/mL) indicates a poor response. FSH levels >10 mIU/mL may signal diminished ovarian reserve and reduced pregnancy chances.
Age’s Role in Egg Quality: Understanding the Decline
Egg quality peaks at 25, with 75% genetically normal eggs. By age 35, 50% are normal, and only 10-15% remain normal by 40. Age is the most accurate indicator of egg quality since no direct test exists.
Balancing Egg Quantity and Quality for Treatment Decisions
Fertility specialists use ovarian reserve tests alongside age assessments to create personalized plans. Options include egg freezing for preservation or tailored IVF protocols to maximize pregnancy potential.
When to Seek Fertility Evaluation (Based on Age and Family Planning Goals)
Women over 35 or those experiencing irregular cycles should consult a specialist. Early evaluation helps identify diminished ovarian reserve and enables proactive strategies like egg freezing.
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