Pregnancy Test Strips

Pregnancy tests are used to determine whether you’re pregnant. They work by detecting the levels of pregnancy hormones in your urine, which can be taken at home or at a doctor’s office. HCG hormone helps keep your body healthy during pregnancy, but it’s also something you can see on a home pregnancy test after conception. This article will discuss pregnancy test strips and how to use them. 

What is a pregnancy test?

A pregnancy test is a blood test that detects the presence of hormones in your body. Home pregnancy tests work by detecting hCG, or human chorionic gonadotropin (hCG), which is produced during pregnancy and released by the placenta. 

A home pregnancy test won’t tell you if you’re pregnant until after ovulation occurs—this happens when an egg leaves its sac and travels down into one of two fallopian tubes before being fertilized by sperm cells from your partner’s semen (or other forms). 

Suppose no LH surges occur during this period. In that case, there will be no visible changes on any home-based analysis product like ClearBlue Digital Ovulation Tests or First Response Ultra Pregnancy Tests.

What hormone levels are checked for a pregnancy test?

The hormone levels that are checked for a pregnancy test include:

  • HCG (human chorionic gonadotropin). This is a hormone produced by the placenta after implantation. When you become pregnant, this level increases rapidly and stays elevated until about 12 weeks into your pregnancy before returning to normal levels.
  • FSH and LH. These two hormones are also produced by the placenta during pregnancy, but they’re not as high as HCG.

What are the different types of pregnancy tests?

There are a few different types of pregnancy tests:

  • A home pregnancy test is the most common test, and you do it. You can buy one at any pharmacy or grocery store for around $10-20. 
  • Take your urine sample in the privacy of your own home, then dip the test stick into it and wait 2 minutes before reading the results. If positive (meaning there is an embryo), read another line for confirmation; if negative, there is no need to worry about further testing!
  • Urine sample – This method involves collecting urine from yourself each morning on waking up and waiting until it’s dark enough outside so that you can see where on the bathroom floor your sample ends up once the collection process has been completed successfully.”

Fast facts on pregnancy tests

Pregnancy tests are simple screening test that detects the presence of hormones called human chorionic gonadotropin (HCG) in your urine. The placenta produces the HCG hormone, which also provides nutrients for your developing fetus. 

If you’re pregnant, your period will be late or absent altogether; if you’re not pregnant and take a pregnancy test after having sex with someone who may be pregnant (like if they tell you), then it will turn positive because of this high level of HCHCG present in their urine sample.

How does a pregnancy test work?

The test works by measuring the level of HCG in your urine, which is produced by cells that form part of the placenta. If you’re pregnant, your body has been producing more HCG hormones since conception. It may also be released into your bloodstream during ovulation (when an egg is released from one ovary).

How to take a pregnancy test

  • Use a clean, dry container.
  • Take the test as soon as possible after you have missed a period. (If you want to ensure it’s early enough in your cycle, wait until after ovulation.)
  • Read the instructions carefully before taking any test and follow those to the letter—do not skip any steps unless otherwise instructed.
  • Do not take this test if you already know you are pregnant.

Are all home pregnancy testing methods the same?

There are several different home pregnancy tests, each with unique characteristics. Some are more accurate than others, and some are more sensitive. The most important thing to remember is that no one test can tell you for sure whether or not you’re pregnant—it simply tells you if there’s a chance that your body could be pregnant!

Clear Blue Easy Digital Ovulation Test offers 99% accuracy in detecting an LH surge (the hormone responsible for ovulation). If using this method, it’s best to wait until after ovulation before taking any test.

How do I take it?

To take the test, follow these steps:

  • First, read the instructions that came with your kit.
  • Then, check the package’s expiration date to ensure it’s still good.
  • Follow all directions exactly as they say, including following any instructions for using a digital test by inserting it into an app or device of your choice, opening and closing both doors of your urine stream midstream before taking a look at what’s going on inside there.

When can I take it?

You can take the pregnancy test strips anytime during your cycle, but you should know some essential things first.

  • If your period is irregular, it may not be clear when you’re pregnant. If you’re worried about this, ask your doctor about getting blood tests to check for other health issues that could explain why you have no period or are late.
  • If you’re taking birth control pills and need to know whether they work well enough to prevent pregnancy while also satisfying other needs of yours, then use a morning-after pill as soon as possible after intercourse—even if there was no ejaculation during sex.

What happens next?

  • Go to your doctor. If you have any questions, they’ll be happy to help.
  • Call your doctor if you need an ultrasound or if there’s something unusual about the test results. Your doctor may want to talk directly with someone with more experience in pregnancy testing before recommending a more invasive procedure like an amniocentesis (inserting a needle into the uterus).
  • Get a blood test done between two weeks and six weeks after using a home pregnancy test kit; this can help determine whether or not an actual baby is growing inside you!

Can medications affect the result?

While most medications are safe to take during pregnancy, a few can affect your pregnancy test results. Medications like:

  • Antihistamines—a standard class of medications used to treat allergies and nasal congestion, these drugs may reduce the amount of HCG in your body. This can make it harder for you to detect HCG if it’s there at all.
  • Vitamin C supplements—vitamin C pills that contain ascorbic acid (vitamin C) have been shown to decrease the amount of HCG in urine samples taken from women who were not pregnant but had high levels of this substance in their systems while taking them.

Other factors that affect the HCG

While many factors affect the HCG, it’s important to remember that other things can also affect your HCG levels. For example:

Your weight is a key factor in determining how much pregnancy hormone your body releases. For example, suppose you’re carrying more than nine months’ worth of pregnancy fat tissue (the placenta and amniotic sac). In that case, it may take longer to see an increase in circulating progesterone levels after ovulation. 

That means if you’re expecting twins or triplets or four little ones at once, those babies will have less time with their mother before they decide they don’t like her anymore and go looking for another set of parents—and that could happen very quickly!

Your age when trying for children; older women tend not to conceive as easily as younger ones because their reproductive systems aren’t quite so active yet (and menopause doesn’t mean an end either).

Pregnancy tests: How Reliable Are They?

The accuracy of home pregnancy tests can be impacted by numerous circumstances (HPTs). How you approach the test is the most crucial element. You need to pay attention to the instructions to obtain accurate results. Other elements that could affect a test’s accuracy include:

HCG Concentration In Your Urine

When a fertilized egg implants in your uterus, your body begins to make HCG hormone. With each stage of pregnancy, the amount of hCG in your urine rises. Therefore, if you test too early, the test may not be able to detect enough hCG in your urine. This is why it’s crucial to hold off on doing an HPT for at least ten days following ovulation.

The Test’s Sensitivity

Lower hCG levels can be detected by some tests, which are more sensitive than others.

Your Urine Concentration

Drinking more liquids before having an HPT may cause your urine to become excessively diluted and reduce the amount of hCG the test may detect.

Your Body’s Hormones

Antihistamines are one class of drugs that can provide false-positive test findings. This suggests that the test misled you into thinking you were pregnant.

Note: It’s recommended to wait at least ten days following ovulation and take the test first thing in the morning if you want to be certain you’re obtaining an accurate result.


The most important thing to remember is that a home pregnancy test can only tell you if you’re pregnant. It won’t tell you how many days late your period was or how far along. If you want to find out more about what causes these problems, consult your doctor or an obstetrician. They have the expertise necessary to help you make decisions based on accurate information—not just what seems right in your head!

(Written by Dr. Ebad Khan)


  • Gnoth, C., & Johnson, S. (2014). Strips of Hope: Accuracy of Home Pregnancy Tests and New Developments. Geburtshilfe und Frauenheilkunde74(7), 661–669.
  • Bu, S., Wang, K., Ju, C., Han, Y., Li, Z., Du, P., Hao, Z., Li, C., Liu, W., & Wan, J. (2018). A pregnancy test strip for detection of pathogenic bacteria by using concanavalin A-human chorionic gonadotropin-Cu3(PO4)2 hybrid nanoflowers, magnetic separation, and smartphone readout. Mikrochimica acta185(10), 464.
  • Pike, J., Godbert, S., & Johnson, S. (2013). Comparison of volunteers’ experience of using and accuracy of reading different types of home pregnancy test formats. Expert opinion on medical diagnostics7(5), 435–441.
  • Coons, S. J., Churchill, L., & Brinkman, M. L. (1990). The use of pregnancy test kits by college students. Journal of American college health : J of ACH38(4), 171–175.
  • Coons S. J. (1989). A look at the purchase and use of home pregnancy-test kits. American pharmacyNS29(4), 46–48.
  • Wheeler M. (1999). Home and laboratory pregnancy-testing kits. Professional nurse (London, England)14(8), 571–576.
  • Nettle man, M. D., Ayoola, A. B., & Brewer, J. R. (2009). Utilization of home pregnancy testing among women at risk for unintended pregnancy. Women’s health issues : official publication of the Jacobs Institute of Women’s Health19(4), 263–267.
  • Home testing. (1997). AIDS policy & law12(14), 12.