Antral Follicle Count by Age: Normal AFC Chart & IVF Outlook (2026)

What is a normal antral follicle count by age? AFC chart, what counts as low or high, how AFC predicts IVF egg yield, and how it compares to AMH.

Antral Follicle Count (AFC) is an ultrasound-based assessment of your ovarian reserve. By counting the small, fluid-filled follicles visible in your ovaries early in your cycle, doctors can estimate how many eggs you have available and predict how you might respond to fertility treatment.

What Are Antral Follicles?

Antral follicles are small (2-10mm) fluid-filled sacs in your ovaries, each containing an immature egg. Every month, your body recruits a group of these follicles, and typically one becomes dominant and ovulates. The number of antral follicles visible on ultrasound correlates with your total egg reserve.

You're born with all the eggs you'll ever have—about 1-2 million. By puberty, this drops to ~300,000-400,000. AFC gives us a snapshot of what remains.

When and How AFC is Measured

AFC is performed via transvaginal ultrasound early in your menstrual cycle:

  • Timing: Days 2-5 of your cycle (before a dominant follicle develops)
  • Procedure: Transvaginal ultrasound; takes about 10 minutes
  • Both ovaries counted: Total AFC = left ovary + right ovary
  • Follicle size: Only follicles 2-10mm are counted as 'antral'

Interpreting Your AFC Results

AFC is typically interpreted as:

  • Excellent (>20 total): High ovarian reserve; may be at risk of OHSS with IVF
  • Normal (10-20 total): Good reserve; likely good response to stimulation
  • Low-Normal (6-10 total): Diminished but not depleted reserve
  • Low (<6 total): Significantly reduced reserve; may need modified protocols
  • Very Low (<4 total): Poor prognosis; consider aggressive timeline

AFC varies slightly cycle to cycle. A single low count should be confirmed with repeat testing. The trend over time is more meaningful than one measurement.

AFC and IVF Response Prediction

Your AFC helps predict how many eggs you might retrieve during IVF:

  • High AFC (>15): Expect strong response; may need lower doses to avoid OHSS
  • Normal AFC (10-15): Standard protocols usually effective
  • Low AFC (5-10): May need higher doses or multiple cycles
  • Very Low AFC (<5): Consider mini-IVF or natural cycle IVF focusing on quality

AFC vs. AMH: How They Complement Each Other

Both AFC and AMH measure ovarian reserve but provide different information:

  • AFC: Direct visualization; can vary with ultrasound quality and timing
  • AMH: Blood test; stable throughout cycle; more objective
  • Together: Give the most accurate picture of ovarian reserve
  • Discordance: If results differ, your doctor will consider both plus your age

When AFC is Low for Your Age

A lower-than-expected AFC may indicate diminished ovarian reserve (DOR). This doesn't mean pregnancy is impossible, but it does suggest working with a fertility specialist sooner rather than later. Time becomes a more important factor when reserve is diminished.

Key takeaways

  • AFC counts small follicles to estimate ovarian reserve
  • Testing is done on days 2-5 of your cycle via ultrasound
  • Normal AFC is 10-20 total between both ovaries
  • AFC helps predict IVF response and guide protocol selection
  • Use AFC together with AMH for complete reserve assessment

Frequently asked questions

Can AFC improve over time?

AFC reflects your remaining egg pool, which only decreases over time. Slight variations cycle to cycle are normal, but a meaningful increase is unlikely. Focus on optimizing egg quality through lifestyle factors.

Is AFC or AMH more accurate?

Both are valuable and complementary. AMH is more consistent and objective. AFC depends on ultrasound quality and timing but gives direct visualization. Using both together provides the best assessment.