Home pregnancy tests are easy, right? Two pink lines mean “pregnant” and one pink line means “not pregnant.” What could be simpler? But your period is over, you’re anxiously waiting for the test results, and all you see is one faint line. What does it mean? Are your eyes deceiving you? Are you pregnant?
Does a faint line on a pregnancy test mean it’s positive?
In most cases, if you follow the manufacturer’s instructions correctly, a faint line will indicate a positive pregnancy test. Typically, the line is a result of HCG being detected in your urine. If you’re not sure if you saw a faint line or want to be more sure, we recommend retesting in a day or two.
Why home pregnancy tests show faint lines
Testing too early: Testing too early is one of the most common reasons for inaccurate or unclear home pregnancy test results. Home pregnancy tests confirm pregnancy by detecting levels of HCG (human chorionic gonadotropin) in the urine. During the first few weeks of pregnancy, the HCG levels in a woman’s body double every 2-3 days. A few days can make a big difference in the amount of HCG detected in the urine. Testing should be done no earlier than 10 days after ovulation, preferably as soon as your period is late.
Miscalculating the estimated time
Another common problem with pregnancy tests is miscalculating when your period is due. Keeping a basal body temperature chart and recording the dates of your menstrual cycle can help eliminate any confusion.
Greek urine
Previously, it was recommended that you only use your first urine of the morning for a pregnancy test. However, most tests on the market today can be used at any time of the day. However, early morning urine is more concentrated than urine throughout the day, so if you’re testing early in the morning, it’s a good idea to use your first urine.
Sensitivity of pregnancy tests
Some home pregnancy tests are more sensitive than others. Some tests can detect pregnancy with HCG levels as low as 20 mIU, while others require HCG levels of 100 mIU to detect pregnancy. A 20 mIU home pregnancy test may show a darker line than a 100 mIU test.
Expired or improperly stored pregnancy tests
Be sure to check the expiration date and storage instructions on your pregnancy test. Expired or improperly stored pregnancy tests may not work accurately.
Evaporation Path
Evaporation lines are caused by urine evaporating from the pregnancy test. These lines are created in areas where a positive result would normally be seen. Evaporation lines are usually colorless. They look like a ball.
Read the test results after the time recommended by the manufacturer.
Pregnancy tests taken after the manufacturer’s recommended time may give a faint positive result. Some pregnancy tests continue to react with urine after the recommended time, giving a false positive result.
Chemical pregnancy
A chemical pregnancy is one in which HCG is produced but does not lead to a normal pregnancy. This is the term used to describe a very early miscarriage.
Some drugs
Certain medications, such as fertility drugs containing Thorazine or HCG, can cause false positives or faint lines on home pregnancy tests. If you are taking these medications, it’s best to check with your doctor to confirm your pregnancy.
If your pregnancy test shows a faint line and you’re unsure of the result, try again or contact your doctor for more information. If your period is late, talk to your doctor.
Think you might be pregnant? Use JM’s due date calculator to find out when your baby is due.
