In infertility evaluation, not all answers appear from the first tests. Sometimes, ovulation is present, the semen analysis does not explain the delay in pregnancy, the uterine cavity appears normal on ultrasound, and embryos transferred during an In Vitro Fertilization treatment develop well in the laboratory. In such situations, the doctor may analyze more carefully the role of the endometrium, meaning the inner lining of the uterus, in the implantation process.
An evaluation of the uterine cavity through hysteroscopy may be recommended when there are anatomical suspicions, such as polyps, synechiae or other visible changes. In other cases, when the medical question concerns the microscopic structure of the endometrium, inflammation or receptivity, an endometrial biopsy may be discussed.
Biopsy is not a routine investigation for every couple facing infertility. It is a procedure recommended selectively, after careful analysis of medical history, previous treatments and the medical objective being pursued.
What Endometrial Biopsy Is and What the Doctor Looks For
An endometrial biopsy involves collecting a small tissue sample from the uterine lining. The sample is then analyzed in the laboratory, usually through histopathological examination, and in certain contexts additional tests may also be used, depending on the clinical suspicion.
In general gynecology, endometrial biopsy is frequently discussed in relation to abnormal uterine bleeding, thickened endometrium or the evaluation of certain cellular changes. In reproductive medicine, however, the interest is more specific: the doctor may want to find out whether the endometrium shows signs of chronic inflammation, whether there are changes that may influence implantation or whether adjustment of the plan before a new embryo transfer is justified.
It is important to know that biopsy does not “measure fertility” in a broad sense and cannot predict pregnancy on its own. It provides information about the endometrium at a certain moment of the cycle or treatment protocol, and the result must be interpreted in the context of the entire case.
When Endometrial Biopsy May Be Recommended in Infertility
An endometrial biopsy may be considered when there is a clear medical question, not merely as an additional investigation “just in case”. In general, the doctor may recommend it in cases where the information obtained could change the therapeutic approach.
Suspicion of Chronic Endometritis
Chronic endometritis is a persistent inflammation of the endometrium, which may have subtle symptoms or may be completely asymptomatic. Some patients do not have pain, fever or altered discharge, and suspicion appears only in the context of infertility, pregnancy losses or implantation failures.
In such situations, biopsy may help identify microscopic signs of inflammation. Sometimes, the analysis may include specific markers, such as CD138, used to highlight plasma cells, which may support the diagnosis of chronic endometritis. The result should not be interpreted in isolation, because criteria may vary, and the therapeutic decision belongs to the specialist doctor.
Implantation Failures or Unsuccessful Embryo Transfers
After one or more embryo transfers without implantation, especially when the embryos were considered to be of good quality, the doctor may reassess the factors related to the uterus and endometrium. At this stage, an endometrial biopsy may be discussed together with other investigations, not as a single answer.
Before a new transfer, correct endometrial preparation, treatment synchronization and exclusion of factors that may affect implantation also matter. For this reason, recommendations related to preparation for embryo transfer should be viewed as part of a personalized medical plan, not as a general list valid for all patients.
Evaluation of Endometrial Receptivity, With Caution
Endometrial receptivity refers to the ability of the endometrium to allow embryo implantation during a specific time window. There are tests that attempt to evaluate this window, but their use must be discussed carefully, because not all situations justify additional testing, and the clinical benefit is not identical for all patients.
In practice, the doctor may consider such an evaluation especially in selected cases, when there are repeated unsuccessful transfers and when other more obvious causes have already been analyzed. An endometrial biopsy used in this context must be integrated into a broader strategy, which includes age, embryo quality, uterine history, previous protocols and any associated conditions.
How the Procedure Is Performed and What Is Important to Know Beforehand
The procedure is usually performed in the office or in a specialized medical setting. The doctor introduces a thin instrument through the cervix to collect a small sample of endometrial tissue. Depending on the technique used and the particularities of the case, the procedure may cause cramps similar to menstrual cramps, pelvic pressure or short-term discomfort.
The timing of the sampling is important. In infertility, an endometrial biopsy may be scheduled in a certain phase of the menstrual cycle or at a specific moment of the hormonal protocol, depending on what the doctor wants to evaluate. For this reason, it is not recommended to schedule the investigation without a clear indication and without precise instructions.
Before the procedure, the doctor may ask you about the date of your last period, the possibility of pregnancy, treatments you are taking, recent infections, allergies, previous uterine procedures and any episodes of abnormal bleeding. In some cases, it may be necessary to exclude an active infection or postpone the procedure.
After sampling, you may experience light spotting, moderate cramps or local sensitivity. The doctor will explain what is normal and which signs should be reported quickly, such as heavy bleeding, fever, intense pain or discharge with an unusual smell.
“You deserve to be listened to, seen, treated with respect and supported throughout every stage of life.”
Andreas Vythoulkas
Specialist in Obstetrics and Gynecology
What the Results May Show and How They Influence the Medical Plan
The result of a biopsy may be normal or may indicate certain changes. In the context of infertility, the doctor may look for the presence of chronic inflammation, histological aspects of the endometrium, indirect signs of hormonal imbalance or other changes that require correlation with ultrasound, hysteroscopy, menstrual history and previous treatments.
If chronic endometritis is identified, the doctor may recommend treatment, sometimes followed by reassessment. If the result does not show relevant changes, this may help narrow down the possible causes and continue the reproductive plan without unnecessary interventions on the endometrium.
In patients undergoing In Vitro Fertilization treatment, the biopsy result may influence the timing of a new transfer, the need to treat inflammation, adjustment of the endometrial preparation protocol or the decision to investigate other factors. However, it is essential to remember that biopsy does not guarantee implantation and does not replace complete evaluation of the couple.
An endometrial biopsy is useful when it answers a concrete medical question. Its value does not lie in the fact that it is a “more advanced” investigation, but in the way the result may guide the next decision.
Frequently Asked Questions
Does endometrial biopsy hurt?
The procedure may cause discomfort or cramps similar to menstrual cramps. The intensity varies from one patient to another, and the doctor can explain beforehand which comfort or pain relief measures may be appropriate in your case.
When is endometrial biopsy recommended in infertility?
It may be recommended in selected cases, especially when there is suspicion of chronic endometritis, repeated implantation failures, unsuccessful embryo transfers or questions related to endometrial receptivity. It is not a first-line investigation for all patients.
Can biopsy confirm chronic endometritis?
Biopsy may provide important information and may support the diagnosis, especially if the analysis includes specific markers. However, the diagnosis must be correlated with medical history, imaging investigations, symptoms, if present, and the specialist doctor’s evaluation.
Can embryo transfer be performed in the same cycle after biopsy?
It depends on the reason for the biopsy, the protocol used and the doctor’s recommendation. Sometimes, biopsy is performed in a separate cycle precisely to allow interpretation of results and possible treatment before transfer.
Does a normal result mean that the endometrium can no longer be a problem?
A normal result is useful, but it does not exclude all possible causes of difficult implantation. The endometrium must be interpreted together with embryonic, hormonal, uterine, immunological and infectious factors, as well as the history of previous treatments.
Does endometrial biopsy increase the chances of pregnancy?
Biopsy is primarily a diagnostic investigation. It does not guarantee increased chances of pregnancy, but it may identify certain treatable problems or help the doctor adjust the plan before the next reproductive step.
Why Choose Genesis Athens for Endometrial Biopsy in Infertility
At Genesis Athens, endometrial evaluation is integrated into a complete medical pathway, not viewed as an isolated investigation. In infertility cases, especially after unsuccessful treatments or difficult implantation, it is important for each recommendation to have a clear purpose and to be correlated with the patient’s history, embryo quality, uterine investigations and reproductive plan.
The Genesis Athens approach aims to avoid both insufficient investigations and excessive testing that does not change the medical decision. An endometrial biopsy may be valuable when it is recommended at the right time and interpreted by a team with experience in infertility, embryology and reproductive medicine.
For patients preparing for a new embryo transfer or those who have experienced implantation failures, coordination between the specialist doctor, laboratory and assisted reproduction team is essential. The aim is not only to obtain a laboratory result, but to build a coherent, realistic plan adapted to your case.
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Sources:
Endometrial Biopsy: When It May Be Recommended in Infertility
Specialist in Obstetrics and Gynecology
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