Medically reviewed by Debra climbed Wilson, Ph.D., MSN, R.N., IBCLC, AHN-BC, CHT — composed by Corey Whelan on might 10, 2017

Overview

Home pregnancy tests space a common tool provided to discover out if you’re expecting. Many at-home pregnant tests are dipsticks. They’re are inserted into a to pee stream. The pole is climate able come detect human chorionic gonadotropin (hCG). This is a hormone created during early on pregnancy.

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Some pregnancy tests finding hCG an extremely early in pregnancy. Reputable house pregnancy tests can be highly accurate, but they no foolproof.

False positives and also negatives can occur for a range of reasons. It’s likewise important come remember that as soon as you have actually a hopeful pregnancy test, view your medical professional to start early prenatal care.

Read on to learn an ext about false positives on home pregnancy tests.


1. Chemical pregnancy

It’s possible to have a optimistic pregnancy test also if you no technically pregnant. This is referred to as a false positive.

It’s sometimes led to by a chemical pregnancy. A chemical pregnant occurs if a fertilized egg, recognized as the embryo, is can not to implant, or grow, an extremely early on. This can take place for a wide selection of reasons.

Early pregnant loss doesn’t occur because of something the woman has done. It may be the result of problems within the uterus, such as:

scar tissuea congenital uterine anomaly that reasons an irregular-shaped uterus

Low quantities of particular hormones, such as progesterone, can reduce the likelihood of implantation and embryo growth.

Some reasons of chemical pregnancy room unknown.

Chemical pregnancies space thought come be very common, however they typically go undetected if a pregnancy test isn’t taken. These at an early stage test results, when wrong, have the right to be emotionally draining.

For that reason, it’s recommended you wait to use an at-home pregnancy test till one mainly after you meant your duration to start.


Sometimes a fertilized egg can implant itself outside of the key cavity the the uterus. This causes an ectopic pregnancy to occur.

Ectopic pregnancies usually occur if a fertilized egg gets stuck in a fallopian tube throughout its trip to the uterus. This kind of ectopic pregnant is likewise known as a tubal pregnancy.

The complying with may cause an ectopic pregnancy:

scar tissue or inflammation in the fallopian tubemisshapen fallopian tubea background of past uterine infections

Ectopic pregnancies can likewise occur in the cervix, ovary, or abdominal muscle cavity.

An ectopic pregnancy can’t proceed to end up being a common pregnancy. The embryo no viable, because there’s no place for the to prosper or thrive exterior of the uterus.

The embryo will still produce hCG, even though it has actually implanted in the wrong place. That can cause a false-positive analysis on an at-home pregnancy test.

Ectopic pregnancies are clinical emergencies. Ectopic pregnancies have the right to be damaging to the woman if left untreated. Extreme blood ns or lose of the reproductive organs can occur.

Symptoms the ectopic pregnancy include:

nausea and sore breasts, i m sorry are additionally symptoms the a regular pregnancysharp waves of pains in the abdomen, pelvis, shoulder, or necksevere pain on one next of the abdomenlight to hefty vaginal spotting or bleedingdizziness or faintingpressure on her rectum

Seek immediate medical aid if you suspect you have actually an ectopic pregnancy.


You may continue to test hopeful for pregnancy following the lose of a pregnancy, either with miscarriage or abortion.

During pregnancy, hCG levels proceed to increase as the placenta grows, copy every few days and peaking at around 10 weeks. As soon as a pregnancy ends, hCG levels begin to recede, but it’s a slow-moving process.

The hormone deserve to remain in your blood and urine because that up to six weeks complying with the finish of the pregnancy. It’s feasible to have a false-positive test until your hCG levels go back to their prepregnancy state.

If the miscarriage was spontaneous, the also possible that not all of the pregnancy-related organization was eliminated. This will reason hCG level to stay elevated.

When this occurs, a minor operation procedure called a dilation and also curettage (D and also C) is often compelled to remove the tissue.


Like many things in life, at-home pregnancy tests no foolproof. It’s important to follow package directions exactly. Inspect the expiration date before using the test.

Even with these safeguards, user error deserve to occur. Among the most typical mistakes is taking the test as well early during your cycle. This can reason either a false an unfavorable or a false positive.

It’s additionally important to use the test once your urine isn’t diluted excessively with water. Use the test as soon as your pee is an extremely concentrated, like once you very first wake increase in the morning.

Leaving the dipstick in your urine stream because that the precise amount that time allotted is additionally important. Consider setting a timer on a stopwatch or your phone. The can assist you track how long the dipstick has remained in your urine stream.

You’ll want to usage a timer again while friend wait for your results. Checking her results throughout the an outcome time frame is additionally important.


Sometimes an evaporation line deserve to be mistaken because that a positive pregnancy test. Part at-home tests present two lines when hCG is detected and one line once hCG isn’t detected.

The lines space usually a bright color, such as pink, red, or blue. Sometimes, a faint-colored 2nd line will appear. This line may represent an early pregnancy or it may be one evaporation line.

It’s probably an evaporation heat if the heat is fully colorless.

Evaporation currently may display up on a test you see after her urine has actually evaporated completely. Occasionally they’re led to by hormone levels the don’t stand for pregnancy.

The best means to protect against being puzzled by one evaporation line is to monitor the test’s timing directions specifically as they’re given.


If you’re trying to come to be pregnant under a doctor’s care, you may be taking fertility medications.

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One of these is the man-made hCG cause shot, offered under the complying with brand names:

NovarelPregnylOvidrelProfasi

The hCG shot helps follicles release mature eggs. That may cause a false-positive reading on an at-home pregnant test, specifically if the check is taken also early.

Other medicines can likewise cause false-positive pregnant tests. Castle include yet aren’t limited to:

antipsychotics, such together clozapine or chlorpromazineanticonvulsants, choose phenobarbital or other barbiturates