Tessa Quinn
Pregnancy tests are used to detect the presence of the hormone human chorionic gonadotropin (hCG) in the blood or urine. This hormone is produced by the placenta and its levels rise steeply during the first 12 weeks of pregnancy. The two main types of pregnancy tests are blood tests and urine tests. Blood tests are performed by doctors, who draw blood from a vein in the arm and send it to a laboratory for testing. Urine tests can be performed at home or by a doctor, and they involve collecting a urine sample in a small container and dipping a test strip into it or holding the strip under the urine stream. Results are typically indicated by the appearance of a coloured line or dot, with two distinct and consistent colour bands in the Control (C) and Test (T) regions indicating a positive result.
| Characteristics | Values |
|---|---|
| Test type | Blood test or urine test |
| Test procedure | Urine test: Dip the test strip into a small container with urine or hold the test strip under the stream of urine. Blood test: A doctor draws blood from a vein in the arm and sends it to a laboratory for testing. |
| Test result interpretation | Urine test: The presence of hCG is indicated by a coloured line or dot. Two distinct and consistent colour bands in the Control (C) and Test (T) regions indicate a positive result. Blood test: The beta HCG test measures the specific HCG hormone in international units per liter (IU/L). |
| Accuracy | Urine test: Up to 99% accurate if performed according to the manufacturer's instructions. Blood test: About 99% accurate. |
| Time taken for results | Urine test: Results are rapid and take a few minutes. Blood test: Results take at least a couple of days. |
| Sensitivity | Urine test: Home pregnancy test kits vary in their sensitivity to hCG. Blood test: Blood tests can detect lower amounts of hCG than urine tests. |
| False-positive results | False-positive results may occur due to high hormone levels caused by menopause, hormone supplements, or certain tumors. |
| Limitations | Urine test: Home pregnancy tests cannot detect pregnancy complications. Blood test: N/A |
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What You'll Learn
Understanding the test format
Pregnancy tests can be performed on either blood or urine samples. Urine tests are the more common type of pregnancy test, and they can be done at home or at a hospital. Blood tests are usually done at a hospital and require a doctor's assistance.
Urine tests use a test strip that is held under a stream of urine or dipped into a small container with a urine sample. The test strip will indicate the presence of hCG (the pregnancy hormone) by displaying a coloured line or dot. The intensity of the colour may vary depending on the concentration and level of hCG development. The test line is usually slightly weaker in intensity compared to the control line. It is important to read the test within the timeframe specified in the instructions, usually around five to ten minutes after taking the test.
Urine tests can produce false negatives if the urine is very dilute, such as in early pregnancy or if the patient is on an IV drip. They can also produce false positives if hormone levels are high due to menopause, hormone supplements, or certain types of tumours. To improve the accuracy of urine test results, it is recommended to use the first urine of the day as it is more concentrated and contains higher levels of hCG.
Blood tests for pregnancy measure the specific HCG hormone in the blood in international units per liter (IU/L). There are two main types of blood pregnancy tests: quantitative and qualitative. Quantitative blood tests measure the exact amount of hCG in the blood and can provide an estimate of how far along the pregnancy is. On the other hand, qualitative blood tests only check for the presence of hCG without measuring the exact levels, so they cannot offer an estimate of gestation. Blood test results are generally about 99% accurate and can detect lower amounts of hCG than urine tests.
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Timing of the test
The timing of a pregnancy test is crucial for accurate results. The human chorionic gonadotropin (hCG) hormone, which is produced during pregnancy, takes time to build up in the body. Typically, hCG can be detected in the blood or urine about 6–10 days after conception. However, the level of hCG in the body increases steeply during the first 12 weeks of pregnancy, doubling every 48 hours.
For at-home pregnancy tests, it is generally recommended to wait until after you have missed your period to take the test. Testing too early can lead to inaccurate results, as the hCG levels may not be high enough to be detected. Most home pregnancy tests are designed to be used about one to two weeks after your period was due. To improve the accuracy of the results, testing first thing in the morning is advised, as early morning urine is more concentrated and contains higher levels of hCG.
If you are experiencing symptoms or require more detailed information, your healthcare provider can offer guidance on the appropriate timing and type of pregnancy test. Urine tests at a healthcare provider's office are similar to at-home tests and can provide results within minutes. Blood tests, on the other hand, are more sensitive and can detect lower levels of hCG earlier in pregnancy. Results from blood tests can take anywhere from a few hours to a couple of days, as the samples are sent to a laboratory for analysis.
It is important to follow the manufacturer's instructions for both at-home and in-office pregnancy tests. Additionally, if you get a negative test result but still suspect you are pregnant, it is recommended to wait a few days and test again. Consulting your healthcare provider for further advice and confirmation of pregnancy is always a good idea.
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Reading the results
Pregnancy tests measure levels of a specific pregnancy hormone called human chorionic gonadotropin (hCG) in the blood or urine. hCG is produced by the placenta and its levels rise steeply during the first 12 weeks of pregnancy, then fall to low levels for the rest of the pregnancy.
Hospital pregnancy tests are rarely inaccurate, but home pregnancy tests can sometimes produce false positives or false negatives. To avoid inaccurate results, it is important to follow the manufacturer's instructions carefully. For example, most home pregnancy tests should be used about one to two weeks after your period was due. Testing too soon after a missed period is a common mistake.
When taking a home pregnancy test, you typically collect urine in a small container and dip the test strip into the urine. Alternatively, some kits offer a test strip that you hold under your stream of urine. To improve the accuracy of results, it is best to test your urine when you first get out of bed as early morning urine is more concentrated and contains higher levels of hCG.
Results are rapid and most test kits take only a few minutes to complete. Most tests use lines to indicate a positive result. Distinct and consistent colour bands will appear on the Control (C) and Test (T) regions. The colour intensity of the bands may vary according to the concentration and level of hCG development. The test line is usually slightly weaker in intensity compared to the control line. Any line at all indicates the test is positive. However, it is important to read the test within the timeframe specified in the instructions, usually around 5 to 10 minutes. Beyond that window, you may see an evaporation line which is not the same as a positive result.
All results should be confirmed by a doctor, especially when making decisions about future medical care. A blood pregnancy test performed by a doctor is more likely to be accurate than a home test.
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Confirming the results
Retest at the Right Time
If you get a positive result on a home pregnancy test, it is advisable to wait a few days and retest to confirm. This is because hCG levels, the hormone detected by pregnancy tests, increase rapidly in the early stages of pregnancy. Retesting after a few days will help determine if hCG levels are rising as expected.
Consult a Doctor
It is always recommended to consult a doctor or healthcare professional to confirm the results of a pregnancy test, especially when making decisions about future medical care. Doctors can provide a blood pregnancy test, which is more accurate than urine tests and can detect lower levels of hCG. They can also order multiple hCG tests to monitor hCG levels and track the development of the pregnancy.
Ultrasound
If you have a positive pregnancy test result, your doctor may schedule an ultrasound to confirm and evaluate the progression of the pregnancy. An ultrasound can provide visual confirmation of the pregnancy and help determine the gestational age of the fetus.
Follow Manufacturer's Instructions
When using a home pregnancy test, it is crucial to follow the manufacturer's instructions carefully. This includes taking the test at the recommended time, usually about one to two weeks after a missed period, and reading the results within the specified time frame. Early morning urine, which has higher concentrations of hCG, can also improve accuracy.
Understand False Positives and Negatives
Be aware of the factors that can lead to false positives or negatives. For example, very early in pregnancy, hCG levels may not yet be detectable, resulting in a false negative. On the other hand, certain medical conditions, such as ovarian or testicular tumors, or taking hormone supplements, can cause high hCG levels and lead to a false positive.
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False negatives and positives
False negatives are more common than false positives. False negatives occur when a test fails to detect pregnancy, even though the individual is pregnant. This can be caused by testing too early, as it takes time for hCG (human chorionic gonadotropin, the pregnancy hormone) levels to rise. Testing before a missed period may result in a negative. Diluted urine, which can be caused by drinking a lot of fluids before testing, can also cause a false negative by lowering hCG concentration. Expired or faulty tests can also be a factor, so always check the expiration date. Improper testing, such as not following instructions, can also affect accuracy.
False negatives can also occur due to a flaw in the pregnancy test. The pregnancy test detects the presence of the hCG hormone in urine. One antibody captures the hormone in the urine, and the other serves as a signal, becoming visible when it detects the correct hormone. However, a degraded form of the hormone, called the hCG core fragment, can also be found in the urine, especially during the late first and entire second trimester. The more of this fragmented hormone that is present, the more likely it is that the test will capture the fragment instead of the intact hormone, resulting in a false negative.
False positives are rare but can occur, especially if the test isn’t used correctly or read too late. A false positive occurs when a test incorrectly detects pregnancy. This can happen when something interferes with the hCG hormone the test is trying to measure. For example, a recent miscarriage or abortion can cause hCG levels to remain in the body for weeks after.
If you suspect a false result, it is important to contact your healthcare provider for further guidance and confirmation.
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Frequently asked questions
Your doctor will either ask you to urinate into a plastic cup or draw blood from a vein in your arm.
A pregnancy test checks your blood or urine for a hormone called human chorionic gonadotropin (hCG). This is a hormone made by the placenta.
Results of blood pregnancy tests take at least a couple of days. Urine tests take about 5 minutes to process.
A positive result will show distinct and consistent colour bands on the Control (C) and Test (T) regions. A negative result will only have one colour band on the Control (C) region.
Hospital pregnancy tests are rarely inaccurate. Blood tests are about 99% accurate and urine tests are over 99% accurate when taken on the expected period.
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