An ectopic pregnancy is one of the few diagnoses in obstetric medicine that can kill a healthy young woman within hours. It is also one of the most commonly missed in early presentation, often in emergency departments and family medicine clinics, and often with consequences that range from preventable surgery to catastrophic blood loss to death.
This post is for patients and families who are wondering whether something went wrong with the medical care provided when an ectopic pregnancy was diagnosed late, ruptured, or missed entirely. It is intended to set out, in plain terms, what an ectopic pregnancy is, what good medical care looks like, where diagnostic failures most often occur, and what to do if you suspect a delayed diagnosis caused serious harm.
What an ectopic pregnancy is
A pregnancy is ectopic when a fertilized egg implants somewhere other than the uterine cavity. The vast majority, around 95 percent, implant in a fallopian tube. Ectopic pregnancies can also implant in the cervix, in the ovary, in the abdomen, or in a previous Cesarean section scar. None of these locations can support a pregnancy, and the embryo cannot be relocated to the uterus.
What makes an ectopic pregnancy dangerous is not just that it is non-viable. It is that the pregnancy continues to grow. As it grows, it stretches and weakens the structure in which it has implanted. Eventually, that structure, most commonly the fallopian tube, will rupture. A rupture causes major internal bleeding into the abdomen and is a true surgical emergency. Untreated, it can be fatal.
Ectopic pregnancy remains a leading cause of maternal death in the first trimester.
Why time matters
When an ectopic pregnancy is diagnosed early and before rupture, treatment can often be medical rather than surgical. A single dose of methotrexate, a medication that stops the pregnancy from progressing, is effective in carefully selected cases identified before rupture. Surgical management before rupture is usually a relatively conservative procedure.
Once the pregnancy ruptures, the choices narrow. Emergency surgery is required to stop the bleeding. The affected fallopian tube is often lost. Future fertility may be compromised. In the most serious cases, the patient does not survive long enough to reach the operating room.
Every part of the early-versus-late difference is clinically and personally significant. Earlier means smaller scars, less pain, a better chance of preserved fertility, and a substantially lower risk of death.
Who is at higher risk
Some women are at higher risk of ectopic pregnancy. These risk factors are well known to physicians and should always be considered when a woman of reproductive age presents with pelvic pain, abnormal bleeding, or a positive pregnancy test:
- A previous ectopic pregnancy
- A history of pelvic inflammatory disease, gonorrhea, or chlamydia
- Prior tubal surgery, including tubal ligation or surgery for endometriosis
- An intrauterine device (IUD) in place
- Use of assisted reproductive technology, including IVF
- Smoking
- Advanced maternal age
The presence of any of these factors raises the index of suspicion. The absence of all of them does not rule an ectopic pregnancy out.
What the warning signs look like
The classic presentation includes some combination of:
- Lower abdominal or pelvic pain, often on one side
- Vaginal bleeding or spotting, sometimes mistaken for an unusual or missed period
- A missed or late period
- A positive pregnancy test
- Shoulder tip pain (a classic sign of intra-abdominal blood irritating the diaphragm after rupture)
- Lightheadedness, dizziness, or fainting (signs of significant blood loss)
Not every ectopic pregnancy presents this way. Some women have minimal symptoms until rupture. Others present with what looks like a routine early pregnancy concern. The point is not that any one of these symptoms is diagnostic. The point is that any combination of pelvic pain and possible pregnancy in a woman of reproductive age is, by default, an ectopic pregnancy until proven otherwise.
What good care looks like
The standard of care for evaluating a possible ectopic pregnancy is well established and reflected in the published guidelines of the Society of Obstetricians and Gynaecologists of Canada and the American College of Obstetricians and Gynecologists.
Pregnancy testing. Any woman of reproductive age with abdominal pain or abnormal bleeding should be tested for pregnancy. This is not an unusual step. It is the threshold step.
Quantitative beta-hCG. A positive pregnancy test in this context is followed by a quantitative beta-hCG to measure the level of pregnancy hormone in the bloodstream. The level helps interpret what should and should not be visible on ultrasound.
Transvaginal ultrasound. Transvaginal ultrasound is the imaging modality of choice. Above a beta-hCG level commonly called the “discriminatory zone,” typically 1,500 to 2,000 mIU/mL, an intrauterine pregnancy should generally be visible. If it is not, the pregnancy is presumed ectopic until proven otherwise.
Serial follow-up. When the location of the pregnancy is uncertain after the first assessment (a “pregnancy of unknown location”), close follow-up is required. Serial beta-hCG measurements at 48-hour intervals tell the clinician whether the pregnancy is developing normally or whether the pattern is consistent with ectopic.
Safety-netting. Patients sent home pending follow-up must be given clear, specific instructions about which symptoms require immediate return to the emergency department.
Where diagnoses go wrong
In the cases I have seen, a delayed diagnosis of ectopic pregnancy tends to follow a few recurring patterns.
The patient is not tested for pregnancy. A woman of reproductive age presents with pelvic pain. A pregnancy test is not done. The pain is attributed to a urinary tract infection, gastroenteritis, an ovarian cyst, or “non-specific abdominal pain.” The patient is sent home. By the time the pregnancy is identified, it has ruptured.
Premature reassurance from an early scan. An early transvaginal ultrasound does not show the pregnancy in the uterus, but the beta-hCG is below the discriminatory zone. The patient is told that the scan is “normal” and reassured, when the correct interpretation is that the location of the pregnancy remains unknown and requires close follow-up.
Failure to follow up a pregnancy of unknown location. The follow-up beta-hCG appointment is not booked, the result is not actioned, or the patient is not contacted when the trend is abnormal.
Misinterpretation of imaging. A pseudosac or a decidual reaction in the uterus is mistaken for an early intrauterine pregnancy.
Inadequate safety-netting. The patient is sent home but is not specifically told that increasing pain, fainting, or shoulder tip pain requires immediate return. She returns later, sicker, with a rupture in progress.
When delayed diagnosis becomes malpractice
Not every case of delayed ectopic diagnosis is negligent. Ectopic pregnancy can present subtly. Symptoms can be attributed in good faith to other conditions early in the course. A reasonable physician may, in the moment, make a decision that turns out to be wrong.
The legal question is whether the care provided fell below the standard a reasonable practitioner would have provided in the circumstances, and whether that failure caused the harm. In ectopic cases, the standard-of-care analysis usually focuses on whether reasonable steps were taken to consider pregnancy, to image the pelvis appropriately, to interpret the imaging and the hormone levels correctly, and to arrange appropriate follow-up. The causation analysis usually focuses on whether earlier diagnosis would, on a balance of probabilities, have prevented the rupture, the loss of a fallopian tube, the loss of fertility, or the death.
What patients and families should do
If you suspect that a delayed diagnosis of ectopic pregnancy contributed to serious harm, the most useful first step is to obtain a complete copy of the medical records from each provider involved: the emergency department, the family medicine clinic, the imaging facility, the laboratory, and the obstetrics service. The records will usually show whether pregnancy testing was done, what the beta-hCG levels were and how they trended, what the ultrasound reports said, and what follow-up arrangements were in place. Reviewed by a malpractice lawyer and the right medical experts, those records will usually answer whether there is a viable claim.
For more on the legal process, see Suing for Medical Malpractice in Ontario: What You Need to Know. The relevant practice areas are Misdiagnosis and Emergency Room Delay.
The first conversation is free and strictly confidential. The earlier we look at the records, the better.
