Ectopic Pregnancy Diagnosis

Medically Reviewed by:Jackie Ross BSc MB.BS MRCOG& Christopher Kyriacou, PhD& Professor Tom Bourne MB.BS, Ph.D, FRCOG
Last Reviewed:01/06/2021
Next review date:01/06/2024
Written by: The Ectopic Pregnancy Trust

Do you or someone you know have symptoms of an ectopic pregnancy?

The incidence of ectopic pregnancy is around 1 in every 80 pregnancies in the UK. Find out more about the symptoms of an ectopic pregnancy.

Please note

Please be vigilant and take symptoms that concern you seriously until absolutely proven otherwise. If your instincts are screaming at you that something does not feel right, it is OK to trust them and ask healthcare professionals for a reassessment at any time. The EPT considers that any woman or person capable of conceiving of childbearing age, who is sexually active or undergoing assisted reproductive technology (ART) treatment, such as in vitro fertilization (IVF), experiencing ectopic pregnancy symptoms (a missed or late period, vaginal bleeding, abdominal pain, shoulder tip pain) should be considered to be pregnant until proven otherwise. 

Please be aware that if you are using contraception including intrauterine device (IUD) and it fails, there can still be a chance of an ectopic pregnancy.

Urinary pregnancy tests, Ultrasound scanning Pregnancy of Unknown Location (PUL) HCG and progesterone blood tests are EPT’s gold standard of care.


Detailed general information can be found here on our website. Please remember that online medical information is no substitute for expert medical care from your own healthcare team. In diagnosing an ectopic pregnancy, medical professionals are likely to undertake some or all of the following tests.

Urinary pregnancy tests

The first, useful basic test is a urinary pregnancy test. These tests check for human Chorionic Gonadotropin (hCG), a pregnancy hormone produced by a fertilised egg after conception. Urinary pregnancy tests can sometimes produce a negative result in pregnancy because the human Chorionic Gonadotropin hormone level is not yet high enough. A positive pregnancy test would usually show if human Chorionic Gonadotropin levels are elevated.

Ultrasound scanning

Whether you have a positive pregnancy test or not, if you have ectopic pregnancy symptoms, it is recommended to speak to your local doctor (GP) or early pregnancy assessment unit (EPAU). If they decide an ultrasound scan (ultrasonography) is appropriate, this will be arranged within 24 hours. It is likely that a transvaginal (internal) ultrasound scan will be required, where a specialised probe is placed into the vagina to get a more detailed look at the reproductive organs. A transvaginal ultrasound scan is safe in pregnancy.

If during the scan a pregnancy – that is a gestation (pregnancy) sac, a foetal pole and a beating heart – can be seen in the uterus (womb), the chance of a coexisting ectopic pregnancy, whilst possible is rare (heterotopic pregnancy). Nonetheless, a complete check will be performed with every ultrasound scan.

If pregnancy is seen in the uterus, vaginal bleeding may be due to implantation and development of the fertilised egg during a healthy pregnancy, or a sign of an impending miscarriage. Pelvic pain may be caused by a normal, healthy corpus luteum cyst, which forms on the ovary after every ovulation, swelling to cause pain. Changes to the bowel and bladder may be attributed to changes in hormones, causing you to pass urine (wee) more often and possibly even be a little constipated (hard to open the bowels to have a poo).

If a pregnancy cannot be seen in the uterus, but there is evidence of internal bleeding and/or swelling in the approximate location of the Fallopian tubes (tubal pregnancy), your doctor will likely suspect a risk of ectopic pregnancy. An initial transvaginal scan will detect over 70% of ectopic pregnancies, and most ectopic pregnancies will be seen as an area of pregnancy tissue, with or without a gestational sac, a fetal pole or a beating heart that is not correctly placed in the uterus.

Diagnosing ectopic pregnancy with ultrasound

Pregnancy of Unknown Location (PUL)

If pregnancy cannot be seen inside or outside the uterine cavity (womb), or if the sonographer is not certain, you may hear this situation being classified as a Pregnancy of Unknown Location, or PUL. It is important to understand that PUL is not a diagnosis; it is a label given until the final location of the pregnancy can be identified with certainty. It is also important to note that this classification does not necessarily mean there is an ectopic pregnancy, as PUL also include healthy intrauterine pregnancies that are initially too small to see on ultrasound scans as well as failing pregnancies that are too small to visualise.

In the event of a PUL, blood tests will be taken to measure hCG (the same hormone measured in urinary pregnancy tests) and another pregnancy hormone called progesterone. The hCG test may be repeated 48 hours later depending on the first results, and this will help the doctors plan if a follow-up ultrasound scan is needed in order to identify the location of the pregnancy.

The reason for this is that until the location of the pregnancy is known with certainty, or the hormone levels have decreased to below pregnancy levels, there is a risk of complications associated with an ectopic pregnancy which has not yet been identified. For every 100 pregnancies initially classified as a PUL, approximately 12 will subsequently receive an ectopic pregnancy diagnosis. Importantly, of these 12, some will not need any treatment. Your doctors will discuss the possible treatment options with you.

All PUL will be followed up until a final early pregnancy location is confirmed as ectopic, or within the uterine cavity. Sometimes a location cannot be confirmed, which is why the hormone level tests may continue for a little longer.

In certain circumstances, a diagnostic laparoscopy or laparotomy may be necessary especially if there is suspicion of ruptured ectopic pregnancy.

Human Chorionic Gonadotropin (hCG) and progesterone blood tests

The hormone hCG is produced during early pregnancy as soon as the body detects that a fertilised egg is present in the body, It is produced by the developing placenta regardless of where the pregnancy is. hCG levels can first be detected by a blood test approximately 11 days after conception and, in a healthy pregnancy, will typically increase during the first 8 to 11 weeks of pregnancy (first trimester), then fall or level off for the remainder of the pregnancy. It is hCG that leads to the ‘morning sickness’ some experience in early pregnancy.

Progesterone is the hormone made by the corpus luteum cyst, which forms on the ovary after every ovulation. If not pregnant, progesterone is only made for two weeks, after which the corpus luteum disappears, a period starts, and a new cycle begins. In pregnancy, this cyst is encouraged to remain and continue releasing progesterone for the first 13 weeks of early pregnancy (first trimester).

HCG and progesterone are used to guide the management of a PUL. The progesterone is measured at the time of the first visit by some doctors, whilst the hCG level is measured at the first visit and then in most cases 48 hours later. Low progesterone and falling hCG levels may indicate the pregnancy is no longer growing, or that the pregnancy has unfortunately already passed as a miscarriage.

High progesterone and normally rising hCG results are associated with a pregnancy that is still present, even if it is not visible on a scan. In this situation, the pregnancy is most likely to be in the correct place in the uterus. Occasionally, however, the hCG levels rise suboptimally, and this can indicate the development of an ectopic pregnancy. The doctor caring for you will interpret these results in order to plan the treatment options and next steps of your care safely.

HCG is also used to help decide the best treatment for ectopic pregnancy. These laboratory findings will be assessed by your doctor alongside your symptoms and your ultrasound scan findings. Ectopic pregnancy might be treated with methotrexate if hCG levels are not more than 5000 IU/l and depending on the clinical situation. When hCG levels are very low and decreasing and if the clinical situation is stable, expectant management may be available. If there is internal bleeding as a result of ruptured ectopic pregnancy, emergency surgery is essential for this life-threatening condition.

Your feelings when diagnosed with an ectopic pregnancy

Going through any diagnostic procedure can be very stressful and worrying, particularly when the potential outcome or final outcome is pregnancy loss. It is important to try to ensure you seek the emotional and physical support you need during both the diagnosis and then both during and after treatment.

Please read more about your emotional journey and others who have shared their experience by reading our emotions page or reading through our personal stories collection.

The Ectopic Pregnancy Trust’s gold standard of care

Read The EPT’s gold standard of care statement
EPT Gold Standard Statement

EPT Gold Standard Statement

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National guidelines

Doctors are at liberty to follow their own hospital protocols in the UK but there are guidelines available to help steer medical professionals. For example:

Nice Guidelines

The National Institute for Health and Care Excellence (NICE) was established in 1999 to reduce variation in the availability and quality of NHS treatments and care. In 2005, it merged with the Health Development Agency and began developing public health guidelines. It is a non-departmental public body sponsored by and accountable to the Department of Health although the guidelines are created by independent committees of experts.

The EPT was fortunate to sit representing lived experiences on NICE’s Ectopic Pregnancy and Miscarriage guidelines committee and consider them to be a step in the improvement of diagnosis, treatment, and care for ectopic pregnancy. We have further been involved in subsequent updates to the guidelines. The Guidelines cover diagnosis and treatment of ectopic pregnancy.

Green-top Guidelines

The Royal College of Obstetricians and Gynaecologists (RCOG) encourages the study and advancement of the science and practice of obstetrics and gynecology and the majority of professionals in the field are members. It produces Green-top Guidelines which include Diagnosis and Management of Ectopic Pregnancy (Green-top Guideline No. 21). These Guidelines also cover diagnosis and treatment of ectopic pregnancy.

Our section for Professionals has further information and links to relevant UK guidelines. The guidelines are designed to be used by doctors rather than the general public so some of the words used may be very technical.

Other pages you might find helpful

Learn more about the different ways an ectopic pregnancy can be treated

Pregnancy of Unknown Location Downloadable PDF

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