Positive Pregnancy Test: How to Read Your Result Correctly

A positive pregnancy test can bring excitement, uncertainty or a mixture of emotions, especially when the test line is faint or looks different from what you expected. Home pregnancy tests detect human chorionic gonadotrophin (hCG) in urine, which rises after pregnancy begins.

Understanding how to read the result correctly can help you know what to do next. This guide explains how line-based and digital pregnancy tests work, what a faint line means, why false-positive results can occur and when you should contact a doctor.

Most home pregnancy tests detect hCG in urine. They are available as line-based tests, cassette tests, midstream tests and digital tests.

For a line-based test, the control line shows that the test has worked correctly. A second line in the test area indicates that hCG has been detected.

The test line does not need to be as dark as the control line to indicate a positive result. If a coloured test line appears within the time specified in the instructions, even if it is faint, the result should generally be considered positive.

Some pregnancy tests use plus or minus symbols, while digital tests may display words such as "pregnant" or "not pregnant". Always follow the instructions supplied with your specific test because the result window and interpretation can vary between products.

If you need a home pregnancy test, Apollo Pharmacy stocks several pregnancy test kits, including the Apollo Pharmacy Instant Mid-Stream HCG Pregnancy Test Cassette.

A faint line can be confusing, but a coloured line that appears within the test's specified result window can indicate pregnancy.

The line may be faint for several reasons:

• Testing early: hCG levels may still be relatively low, particularly if you test before or around the time your period is due.
• Diluted urine: Drinking a large amount of fluid before testing can reduce the concentration of hCG in urine.
• Early pregnancy: hCG usually rises substantially during early pregnancy, so a test may become more clearly positive over the following days.

If you get a faint positive result and are unsure what it means, repeat the test after about 48 hours, preferably using first-morning urine. If the result remains unclear or you develop pain or bleeding, contact your doctor.

How Can You Tell an Evaporation Line From a Faint Positive?

An evaporation line can appear when urine dries on the test after the recommended reading time has passed. It may look colourless, grey or different from the coloured test line.

A true positive line generally has the colour specified for that particular test and appears within the manufacturer's stated reading time.

The most important rule is to interpret the test only within the time window provided in the instructions. Do not rely on a line that appears after the recommended reading time.

A false-positive pregnancy test is uncommon, but several situations can cause a positive result even when there is no ongoing pregnancy.

Chemical Pregnancy

A chemical pregnancy is a very early pregnancy loss that occurs shortly after implantation. hCG may rise enough to produce a positive test before falling again. You may subsequently have vaginal bleeding around the time your period is due or shortly afterwards.

Recent Pregnancy

After a miscarriage, abortion or delivery, hCG can remain in the body for some time. A pregnancy test may therefore remain positive even though there is no new pregnancy.

Fertility Medicines Containing hCG

Some fertility treatments contain hCG and can cause a positive pregnancy test. If you are undergoing fertility treatment, ask your fertility specialist when a home pregnancy test is appropriate.

Test Errors

Using an expired or damaged test, storing it incorrectly or failing to follow the instructions can affect the reliability of the result. Reading the test after the specified time can also lead to confusion because of evaporation lines.

Certain uncommon medical conditions can also produce hCG and require medical evaluation.

Home pregnancy tests are highly reliable when used correctly, but their accuracy depends on when and how the test is performed.

Testing too early is one of the most common reasons for a negative result when pregnancy is actually present. Testing on or after the first day of a missed period generally gives a more reliable result than testing several days beforehand.

For the most reliable result:

• Check the expiry date before use.
• Follow the instructions supplied with the test.
• Use the recommended amount of urine.
• Avoid drinking excessive amounts of fluid immediately before testing.
• Read the result within the specified time.
• Repeat the test if the result is negative but your period does not start.

A blood test can measure hCG more precisely and may be recommended by your doctor when the result is uncertain or when there are symptoms that require further assessment.

If your home pregnancy test is positive, arrange an appointment with your doctor or obstetrician. A home test can indicate pregnancy, but your healthcare professional can confirm the pregnancy and begin antenatal care.

Your first appointment may include a review of your medical history, current medicines and supplements, previous pregnancies and any health conditions that could affect pregnancy. Your doctor can also advise you about folic acid, other supplements, vaccinations, lifestyle measures and the timing of an ultrasound.

You may not need an immediate ultrasound if you have no symptoms or risk factors. Your doctor will decide when an ultrasound or blood test is appropriate based on your circumstances.

When Should You Seek Urgent Medical Care?

A positive pregnancy test accompanied by certain symptoms needs prompt medical assessment.

Seek urgent medical care if you experience:

• Severe or worsening abdominal or pelvic pain
• Pain that is mainly on one side
• Heavy vaginal bleeding
• Severe dizziness or fainting
• Shoulder-tip pain, particularly with abdominal pain or dizziness
• Severe vomiting that prevents you from keeping fluids down

One-sided abdominal or pelvic pain with bleeding, dizziness or fainting can be a sign of an ectopic pregnancy, which requires urgent assessment.

Home pregnancy tests are generally safe and non-invasive, but some situations can make the result difficult to interpret.

Do not rely solely on a home pregnancy test if you:

• Are undergoing fertility treatment involving hCG-containing medicines.
• Have recently had a miscarriage, abortion or delivery.
• Have a previous or suspected ectopic pregnancy and have a positive test.
• Have been advised by your doctor that a medical condition or treatment may affect your hCG result.
• Get an unexpected result that does not match your symptoms or menstrual history.
• Get a positive result followed by a negative result, particularly if you develop bleeding or abdominal pain.

If you have recently had a pregnancy loss or treatment for an ectopic pregnancy, ask your doctor when it is appropriate to use a home pregnancy test again because hCG can take time to return to non-pregnant levels.

A positive result should not be ignored simply because the test line is faint. Likewise, a negative result does not completely exclude pregnancy if the test was taken too early. If your period remains absent or you continue to have pregnancy symptoms, repeat the test or speak with your doctor.

A positive pregnancy kit usually means that hCG has been detected in your urine and pregnancy is likely. A faint coloured line that appears within the test's specified reading time can also indicate a positive result, while a line that appears only after the recommended reading time may be an evaporation line.

After a positive result, arrange antenatal care and discuss any medicines or supplements you take with your doctor or pharmacist. Seek urgent medical attention if a positive test is accompanied by severe or one-sided abdominal pain, heavy bleeding, fainting, severe dizziness or other concerning symptoms.