Both blue and pink dye tests employ a chemical reaction that activates a color change on a designated strip to display a line or plus sign when hCG is detected in urine. Digital tests will display a reading notifying you if you are “pregnant” or “not pregnant” depending on hCG.
What if a pregnancy test turned blue?
The blue dye tests have been known to be more likely to give you an evaporation line than the pink dye tests. You can also only read the result within the time limit! Each brand of pregnancy test should indicate on the box when the test results should be read.
Does blue mean not pregnant?
In laboratory tests Clearblue DIGITAL Pregnancy Test is more than 99% accurate in detecting whether or not you are pregnant, when used from the day your period is due.
What causes a dye run on a pregnancy test?
Only urine that contains a sufficient level of hCG can cause the test’s dye to stain in a way that shows a positive result. In early pregnancy, there may be very little hCG in the urine, and the positive line may be faint.
Does an invalid pregnancy test mean she is pregnant?
Either you’re not pregnant or it’s too early to test. Invalid: If only the test line (T) shows up, or no lines develop, the test didn’t work. This could mean the absorbent tip wasn’t saturated with enough urine, or the test is expired or damaged. Grab another test and try again.
Can a negative pregnancy test turn positive overnight?
After getting a negative result on a home pregnancy test, it’s fair to conclude that you’re not pregnant. However, if you happen to glance back at the test later in the day, you may be surprised to see that a positive line has magically appeared.
What happens if you pee too much on a pregnancy test?
The hook effect happens when you have too much hCG in your blood or urine. How is this possible? Well, the high levels of hCG overwhelm the pregnancy test and it doesn’t bond with them correctly or at all. Rather than two lines saying positive, you get one line that incorrectly says negative.
Does it matter how dark the line is on a pregnancy test?
When taking a pregnancy test, any line in the test indication area is considered a positive pregnancy test, even if it is lighter than the control line. The darker line is usually the control line.
How long should you hold your pee for a pregnancy test?
You can recreate first-morning urine for a pregnancy test by not using the bathroom for at least 4 hours. Using an early pregnancy test at night is another option if you’re further along in your pregnancy. Blood tests are more sensitive than urine tests and can be performed in your doctor’s office.
How late should my period be before I take a pregnancy test?
You should wait to take a pregnancy test until the week after your missed period for the most accurate result. If you don’t want to wait until you’ve missed your period, you should wait at least one to two weeks after you had sex. If you are pregnant, your body needs time to develop detectable levels of HCG.
Is it better to pee on a pregnancy test or in a cup?
With test strips, you’ll want to pee in a cup and dip the test strip in the cup to get an accurate result. If you try to pee directly on the strip, the results may be blurry or invalid.