Endometrium Thickness Ultrasound
A transvaginal ultrasound test that measures the thickness of the endometrial lining of the uterus. It helps your doctor evaluate abnormal bleeding, fertility concerns, and overall uterine health using safe sound waves with no radiation.
{"Measures the endometrial lining thickness via ultrasound","Helps evaluate gynecological conditions like abnormal bleeding or infertility","Performed using a probe inserted into the vagina","No blood sample is required","Results help doctors assess endometrial health"}
Key facts at a glance
- LOINC
- 12145-9
- Short code
- ENDO THICK US
- Synonyms
- Endometrium Thickness US.meas
- Category
- cardiac
- Sample
- serum
- Container
- N/A - Imaging study (ultrasound examination)
- Units
- N/A
- Ref low
- 3
- Ref high
- 15
- Critical range
- — – 10000 N/A
- Fasting
- false
- Population
- adult
- Sex
- female
- Age range
- ≥ 18 years
- Method
- us-measured
- CPT
- 76830
- SNOMED
- 387713003
- Specimen volume
- N/A - Non-specimen test
- Stability
- N/A - Real-time imaging
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 0–24 hours
- Order
- routine
What is this test?
Endometrium Thickness Ultrasound is an imaging test that measures the thickness of the endometrial lining inside the uterus. The endometrium is the tissue that lines the uterus and changes thickness throughout the menstrual cycle. This test uses sound waves to create images of the uterine lining.
How is the test performed?
A transvaginal ultrasound is used for this test. During the procedure, a thin, wand-like probe (transducer) is gently inserted into the vagina. This probe sends sound waves that create detailed images of the uterus and endometrial lining on a monitor. The procedure is typically done while you lie on your back with your knees bent.
Why is this test done?
Your doctor may recommend this test if you experience abnormal vaginal bleeding, have difficulty becoming pregnant, or need evaluation for conditions such as endometrial polyps, fibroids, or hyperplasia. It is also used to monitor endometrial health in women taking hormone therapies or those with a history of endometrial abnormalities.
How to prepare for the test?
The test is usually scheduled at a specific point in your menstrual cycle, often around day 5-7, depending on your doctor's instructions. You may be asked to empty your bladder before the procedure. No fasting or special preparation is typically required. Wear comfortable, loose-fitting clothing for easy access during the exam.
Does the test hurt?
Most women experience only mild discomfort during a transvaginal ultrasound. The probe is lubricated and designed to fit comfortably. If you feel any pain or discomfort, inform the technician immediately.
Reference range
Premenopausal: 3-15 mm (varies by menstrual cycle phase - follicular phase: 3-8 mm, luteal phase: 8-14 mm); Postmenopausal (no HRT): <5 mm; Postmenopausal (with HRT): <8-10 mm; Postmenopausal with bleeding: >4-5 mm requires evaluationN/A
Transvaginal ultrasound: Empty bladder preferred for better imaging. Transabdominal approach (if performed): Full bladder may be requested. No fasting required. Best performed day 5-7 of menstrual cycle (proliferative phase) for baseline evaluation or day 20-23 (secretory phase) for luteal phase assessment.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
The endometrial thickness varies throughout the menstrual cycle. A thin endometrium (less than 7mm) may indicate low estrogen or poor endometrial development, which can affect fertility. A thick endometrium (greater than 12-14mm in postmenopausal women) may suggest endometrial hyperplasia or cancer and requires further evaluation. In premenopausal women, the endometrium normally thickens during the cycle in preparation for potential pregnancy.
Frequently asked questions
Is the test safe?
How long does the test take?
Will I get results immediately?
Can I have this test during my period?
What is a normal endometrial thickness?
Sources
- 1
- 2
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 17, 2026. · Read our editorial policy