Persistent Positive Pregnancy Test

Positive Pregnancy Test after a Miscarriage

How Long It Remains Positive and Causes of a Persistent Positive Test

If you've had a diagnosis of miscarriage, you may be confused if you take a pregnancy test and find that it's positive. This has a few different explanations.

Learn how a pregnancy test works and how long it usually remains positive after a miscarriage.

How a Pregnancy Test Works

Pregnancy tests detect the presence of the pregnancy hormone HCG (human chorionic gonadotropin) in the blood or urine. Most of the time, HCG is only in a woman's body during pregnancy, so a test is usually fairly conclusive for pregnancy.

There are some rare ovarian tumors which secrete HCG, but these are extremely uncommon.

However, after an embryo or fetus stops growing and a miscarriage occurs, the hormone does not disappear from a woman's body right away.

The level of HCG gradually decreases, falling back down to zero over a period of days, or even weeks, depending on how far along the pregnancy was when the miscarriage happened.

Because today's pregnancy tests usually detect even very low levels of HCG, taking a pregnancy test in the days or immediate weeks after your miscarriage can still show a positive result.

You may also continue to feel pregnancy symptoms after a miscarriage, even when it is 100 percent certain that you have miscarried/Aborted

Time Frame for HCG to Return to Normal

It takes an average of 12 to 16 days for HCG to disappear from the body, but this can vary based on how high your HCG level was at the time of your miscarriage. 

It can take around a week to return to zero with a chemical pregnancy (a very early pregnancy loss) and up to a month, or even more, with a miscarriage that occurs later in pregnancy. After that, a pregnancy test won't be positive.

Causes of a Persistent Positive Pregnancy Test after Miscarriage

If it has been more than a couple of weeks since your miscarriage, you should call your doctor if you are still getting a positive pregnancy test. In this situation, your doctor may want to monitor your HCG level with blood tests (a quantitative HCG). If you continue to have a positive blood pregnancy test, there is a possibility that you are:

  • Pregnant again
  • Experiencing an incomplete miscarriage( incomplete Abortion)
  • Experiencing a molar pregnancy (very rare)

Pregnant Again

If you have been sexually active and have a positive pregnancy test soon after a miscarriage, it's also possible that you might be pregnant again. Your doctor will be able to tell you for sure one way or the other; though s/he may need to follow you with blood HCG tests to know for sure.

Although many women are not aware of this, it's possible to become pregnant during your first menstrual cycle after a miscarriage. If you are not trying to become pregnant after your pregnancy loss, you should use contraception to prevent a pregnancy until you are ready.

Incomplete (Abortion) Miscarriage

With an incomplete miscarriage, there is still pregnancy tissue leftover in your uterus. Unfortunately, it does not mean that your pregnancy is continuing or is viable.

You may need a simple surgical procedure called a D&C (dilation and curettage) to remove the retained products of conception, which are usually only small pieces of the placenta.

These tissues will probably be reabsorbed (broken down) by your body in time, but surgery can help put a stop to heavy bleeding sooner, as bleeding is a common symptom of an incomplete miscarriage.

Molar Pregnancy

Very rarely, a positive pregnancy test may occur with gestational trophoblastic disease— a term used to describe several conditions (like a molar pregnancy) in which there is an abnormal growth of placental tissue.

A Word from Kalson Medical Services

Experiencing a miscarriage can be an emotional rollercoaster and the confusion over a persistently positive pregnancy test can add to this already difficult situation.

Be assured that it can take a variable amount of time (on average two weeks) for a woman's HCG level to disappear after a miscarriage.

If you feel like something is not right, or you are experiencing heavy or persistent bleeding, worsening pelvic pain, or a fever with your miscarriage, seek medical attention immediately

Kalson Medical Group