Ethan Rhodes
Pregnancy tests are among the most common tests in healthcare. They can be done at home or in a hospital. Home pregnancy tests are quick and easy to use, but if you get a negative result and still think you're pregnant, it's recommended that you wait a few days and try again. You can also schedule an appointment with a PCP or OB-GYN for a urine or blood pregnancy test. Blood tests are more expensive and take longer, but they can detect lower levels of HCG, making them more sensitive than urine tests. Urine tests are often the first choice due to ease and convenience.
| Characteristics | Values |
|---|---|
| Test Type | Urine test, Blood test, Ultrasound |
| Test Location | Doctor's office, Hospital, Lab |
| Test Sensitivity | Urine test: 97-99% accurate, Blood test: More sensitive than urine test |
| Test Cost | Urine test: Inexpensive, Blood test: Expensive |
| Test Time | Urine test: Results within minutes, Blood test: Results within hours to days |
| Test Reasons | Trying to conceive, Ruling out pregnancy, Missed period, Confirming pregnancy, Beginning prenatal care, Contraceptive failure, Unprotected sex |
| Test Results | Positive: hCG found, Negative: No hCG found |
| Test Follow-up | Positive: Prenatal care, education, check-ups, Negative: Counselling, protection advice |
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Urine tests
To perform a urine pregnancy test, a woman urinates into a clean cup and then places one to several drops of urine on a chemical test strip, or urinates directly onto the stick. The test strip contains a chemically sensitive substance that detects the presence of human chorionic gonadotropin (HCG), a hormone that starts to be produced around six days after fertilisation. The results of the test are usually ready within one to two minutes.
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Blood tests
Doctors use two types of blood tests to check for pregnancy:
- Quantitative blood test (or the beta hCG test): This measures the exact amount of hCG in your blood, so it can detect even tiny amounts of hCG. This makes it very accurate.
- Qualitative hCG blood test: This test simply checks to see if the pregnancy hormone is present or not, giving a yes or no answer. This type of test is about as accurate as a urine test.
During pregnancy, you will also be offered blood tests to check for other things, such as infectious diseases (e.g. hepatitis B, syphilis, HIV) and genetic conditions (e.g. Down's syndrome, sickle cell).
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Ultrasound scans
The second ultrasound is typically done between 18 and 22 weeks and is called the morphology or anatomy ultrasound. This scan checks for physical conditions in the baby, including the baby's heart, brain, bones, and kidneys. It can also detect birth disorders like cleft palate and may show the biological sex of the fetus.
In addition to these routine scans, further scans may be recommended if there are specific indications or concerns. Ultrasound scans can be used to check for ectopic pregnancy, molar pregnancy, miscarriage, or other early pregnancy complications. They can also examine the mother's pelvic organs, such as the uterus, ovaries, and cervix, as well as the amount of amniotic fluid and the location of the placenta.
It is important to note that ultrasound scans are not compulsory, and it is the patient's choice to have one. However, they can provide valuable information to guide ongoing care and help detect potential issues early on.
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First trimester screening
The first trimester screening consists of three parts: an ultrasound test for fetal nuchal translucency (NT), and two maternal serum (blood) tests. The ultrasound test uses specialised imaging to examine the back of the fetal neck for increased fluid or thickening, which may indicate a defect. The blood tests measure two substances found in the blood of all pregnant women: Pregnancy-associated plasma protein-A (PAPP-A) and Human chorionic gonadotropin (hCG). Abnormal levels of these substances may indicate an increased risk for chromosome abnormalities.
After the tests are completed, the results are evaluated within a week. The results will indicate whether the risk level is "normal or abnormal". A high-risk or positive result is when the chance of the baby having Down syndrome is higher than 1 in 300. It's important to note that first trimester screening is not 100% accurate and is not a diagnostic test. A positive result does not mean that the baby definitely has one of the conditions, but indicates that further diagnostic tests are options to consider. Similarly, a negative or normal result does not mean a chromosomal abnormality is definitely not present. If the results indicate an increased risk, healthcare providers may recommend additional testing, such as chorionic villus sampling, amniocentesis, or another ultrasound, to confirm a diagnosis.
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HCG levels
HCG, or human chorionic gonadotropin, is often referred to as the pregnancy hormone. It is made by cells formed in the placenta, which nourishes the egg after it has been fertilized and becomes attached to the uterine wall.
Pregnancy tests detect the presence of HCG in either blood or urine. Urine tests are typically done at home and are up to 99% accurate, providing results within minutes. Blood tests, on the other hand, are more sensitive and can detect lower levels of HCG earlier in pregnancy. They are usually done in a healthcare provider's office and involve giving a blood sample, which is then sent to a lab for analysis. Results from blood tests can take anywhere from a few hours to two days.
It is not common for doctors to routinely check HCG levels unless there are signs of a potential problem. A healthcare provider may recheck HCG levels if there is bleeding, severe cramping, or a history of miscarriage. If you are concerned about your HCG levels, it is best to speak to your doctor or a maternity healthcare professional.
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Frequently asked questions
Hospitals offer both urine and blood pregnancy tests. Urine tests are often the first choice due to their ease and convenience. Blood tests are usually recommended if the urine test results are inconclusive, or if you need more detailed information, such as tracking HCG levels.
If you are taking a urine test, it is recommended to use the first morning pee, as this is when HCG levels are the most concentrated and easily detected. Avoid drinking excessive fluids before the test as this can dilute your HCG levels.
For a urine test, you will urinate into a sterilized container, and a testing strip will be dipped into it to obtain results. For a blood test, a small sample of blood will be drawn from a vein in your arm and sent to a laboratory for analysis.
Urine tests at hospitals are up to 99% accurate. Blood tests are even more sensitive and can detect lower levels of HCG earlier in the pregnancy, but they are rarely done because they are more expensive and usually yield the same result as urine tests.
If your results are positive, your doctor will start your prenatal care and educate you on what to expect during your pregnancy. If your results are negative, the doctor will likely discuss the necessity of protection if you are not trying to conceive. If you are trying to conceive, they may explain possible reasons for the negative result and recommend lifestyle modifications to improve your chances. If you still think you're pregnant despite a negative result, wait a few days and try again.
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