Ovarian Assessment Report (OAR)

Definition - What does Ovarian Assessment Report (OAR) mean?

The ovarian assessment report (OAR) is a detailed report on a woman’s ovarian reserve (egg supply) that takes into account the levels of different reproductive hormones in combination with age to yield the egg retrieval score (ERS). The ERS is a measure of a woman's egg supply. The higher the ERS, the greater are the chances of having an excellent egg supply. The OAR provides the most accurate assessment of a woman’s egg supply during her reproductive years. Women with an excellent ERS are potential candidates for egg donation.

Although OAR provides an accurate estimation of a woman's egg supply, not many clinics seem to perform the testing.

FertilitySmarts explains Ovarian Assessment Report (OAR)

The OAR requires withdrawing of a blood sample. The two key hormones assessed are follicle-stimulating hormone (FSH) and anti-Müllerian hormone (AMH). The hormonal levels are added to a woman’s age and to the number of eggs obtained during egg retrieval to calculate the ERS. The score ranges from 1 to 20 with the quality of egg supply boosting as the score increases as follows:

  • An ERS of 1 to 5 implies that the egg supply is reduced.
  • An ERS of 6 to 10 means that the egg supply is satisfactory.
  • An ERS of 11 to 15 indicates that the egg supply is fine.
  • An ERS of 16 to 20 means that the egg supply is excellent.

The benefits of OAR are as follows:

  • It allows for more accurate identification of women who will respond poorly to ovarian stimulation.
  • The results are more accurate than AMH or FSH levels evaluated alone.
  • It can more appropriately detect the ERS of an egg donor candidate.
  • It can help determine the most favorable course of treatment for a woman.

The ERS is calibrated using data from hundreds of women undergoing fertility treatments. It helps to predict the number of eggs that can be retrieved through controlled ovarian stimulation.

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