Igenomix Era Calculator

Determine your personalized embryo transfer (pET) timing based on your ERA test results.

ERA Test Calculator

Recommended Transfer Timing

Biopsy Progesterone Exposure:

ERA Result Interpretation:

Recommended Exposure:

Calculation Basis:

This calculator provides an estimation for your next cycle. Always confirm the final schedule with your fertility specialist.

What is the Igenomix ERA Calculator?

The Igenomix ERA Calculator is a specialized tool designed to interpret the results of an Endometrial Receptivity Analysis (ERA) test. This test, developed by Igenomix, identifies a woman’s unique “window of implantation” (WOI) – the precise time when her uterine lining (endometrium) is ready to accept an embryo. About 30% of women have a displaced WOI, meaning their optimal time for transfer is different from the standard protocol. This calculator translates your specific ERA result into a practical, personalized embryo transfer (pET) schedule for your subsequent IVF cycle, aiming to synchronize the transfer with your peak receptivity.

Igenomix ERA Calculator Formula and Explanation

The calculation isn’t a complex mathematical formula, but a time-based adjustment derived from your ERA test cycle. The core principle is to replicate the conditions of your test cycle and then adjust the timing based on the test’s recommendation.

Core Logic: Recommended Transfer Time = Start of Progesterone in Transfer Cycle + Recommended Progesterone Exposure

The calculator first determines the duration of progesterone exposure at the time of your biopsy. It then applies the adjustment from your ERA report to find the ideal total exposure time. This ideal time is then used to project the optimal transfer date and time in your next cycle.

Table of Variables

Variable	Meaning	Unit	Typical Range
Progesterone Start Date	The calendar date you begin progesterone supplementation.	Date	N/A
Biopsy Time	The time of day the endometrial tissue was collected.	Time (HH:MM)	Clinic Hours
ERA Test Result	The receptivity status of your endometrium.	Categorical	Receptive, Pre-Receptive, Post-Receptive
Timing Adjustment	The number of hours to shift the transfer time.	Hours	-24, -12, +12, +24

Practical Examples

Example 1: “Pre-Receptive” Result

A patient’s ERA test indicates her endometrium is Pre-Receptive, with a recommendation for an additional 24 hours of progesterone exposure.

• Inputs:
  • Progesterone Start Date (Mock Cycle): October 1, 2025
  • Biopsy Time: 10:00 AM after 120 hours of progesterone.
  • ERA Result: Pre-Receptive
  • Recommended Adjustment: +24 hours
• Calculation:
  • Biopsy Exposure: 120 hours
  • Recommended Exposure: 120 hours + 24 hours = 144 hours
• Result: For her next cycle, the embryo transfer should be scheduled after 144 hours of progesterone exposure, which is 24 hours later than the original biopsy timing.

Example 2: “Post-Receptive” Result

A patient’s ERA test shows her endometrium is Post-Receptive, with a recommendation for 12 fewer hours of progesterone exposure.

• Inputs:
  • Progesterone Start Date (Mock Cycle): November 5, 2025
  • Biopsy Time: 11:00 AM after 120 hours of progesterone.
  • ERA Result: Post-Receptive
  • Recommended Adjustment: -12 hours
• Calculation:
  • Biopsy Exposure: 120 hours
  • Recommended Exposure: 120 hours – 12 hours = 108 hours
• Result: For her next cycle, the embryo transfer should be scheduled after 108 hours of progesterone exposure, which is 12 hours earlier than the original biopsy timing.

How to Use This Igenomix ERA Calculator

1. Enter Progesterone Start Date: Input the exact date you started taking progesterone during the cycle your ERA biopsy was performed.
2. Enter Biopsy Time: Input the time of day the biopsy was taken.
3. Select ERA Result: Choose the result from your Igenomix report (e.g., Receptive, Pre-Receptive).
4. Enter Adjustment (if applicable): If your result is Pre- or Post-Receptive, a field will appear. Enter the number of hours for adjustment as specified in your report.
5. Calculate: Click the “Calculate Transfer Window” button. The tool will display your personalized transfer timing for your next cycle. You can also find help with an IVF due date calculator.
6. Review Results: The output will show the exact recommended date and time for your embryo transfer, along with the calculated progesterone exposure times. Always discuss these results with your fertility clinic.

Key Factors That Affect Endometrial Receptivity

Several factors can influence when your endometrium is most receptive. The ERA test is designed to account for your unique biological timing. For more information, please see this page

• Individual Biology: Every woman’s cycle is slightly different, which is the primary reason for a displaced window of implantation.
• Hormone Protocol: The type and dosage of estrogen and progesterone used to prepare the uterine lining are critical.
• Progesterone Absorption: How your body metabolizes progesterone (injections, suppositories, etc.) can affect the timing of receptivity.
• Underlying Conditions: Conditions like adenomyosis or endometritis can impact the uterine environment.
• Uterine Anatomy: Structural issues within the uterus could potentially influence the lining’s development.
• Gene Expression: The ERA test directly analyzes the expression of 248 genes related to implantation to determine the receptivity status.

Understanding these factors highlights why a standardized approach doesn’t work for everyone and why a tool like the Igenomix era calculator can be so valuable.

Frequently Asked Questions (FAQ)

1. What does a “Receptive” result mean?

A “Receptive” result means your biopsy was taken during your optimal window of implantation. Your personalized embryo transfer should be timed to have the same duration of progesterone exposure.

2. What does “Pre-Receptive” mean?

“Pre-Receptive” means your uterine lining was not yet ready for implantation at the time of biopsy. Your ERA report will recommend a longer period of progesterone exposure, typically an additional 12 or 24 hours.

3. What does “Post-Receptive” mean?

“Post-Receptive” means your window of implantation had already passed when the biopsy was taken. The report will recommend less progesterone exposure, usually 12 or 24 hours shorter.

4. What happens if I get a “Non-Receptive” result?

A “Non-Receptive” result can indicate a more significantly displaced window or other issues. The Igenomix computational predictor can still estimate your WOI in most cases, but sometimes a second biopsy with different timing may be required.

5. Is the Igenomix ERA test accurate?

The ERA test is a highly endorsed diagnostic tool with numerous publications supporting its use in personalizing embryo transfers and improving outcomes for patients, especially those with recurrent implantation failure.

6. Why do I need to enter the biopsy time?

The window of implantation is precise down to the hour. The exact time is needed to calculate the total hours of progesterone exposure accurately before applying the recommended adjustments.

7. Can I use this calculator for a natural cycle?

This calculator is designed for hormone replacement therapy (HRT) mock cycles, which are the most common for ERA testing. Natural cycle ERA testing is different and calculations should be confirmed directly with Igenomix or your clinician.

8. Should I make changes to my medication based on this calculator?

No. This calculator is an informational tool. All medical decisions, including medication timing and transfer scheduling, must be made in direct consultation with your fertility doctor and clinical team. For more information, see Endometrial Receptivity Analysis.

Related Tools and Internal Resources

Here are some other tools and resources you might find helpful on your journey:

• Ovulation Calculator: A tool to predict ovulation for natural cycles.
• IVF Success Rate Estimator: Explore factors that contribute to IVF outcomes.
• Pregnancy Due Date Calculator: Estimate your due date after a successful transfer.