is hcg blood test necessary?
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For most women, a pregnancy blood test isn't necessary. If you've taken a home pregnancy test and gotten a positive result, your ob-gyn will likely see you around eight weeks after your last menstrual period and confirm your pregnancy with a transvaginal ultrasound.
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A blood test can detect pregnancy even before you've missed a period. Pregnancy blood tests are about 99 percent accurate. A blood test is often used to confirm the results of a home pregnancy test.
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Urine HCG tests often return false-negative results, particularly very early in pregnancy. This can be stressful and demoralizing to people struggling to become pregnant. Blood tests are typically more accurate, though even these may fail to pick up low levels of HCG in early pregnancy.
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Quantitative blood test – measures the exact amount of hCG in the blood and can give you an estimate of how far along the pregnancy has progressed. Qualitative blood test – only checks for the presence of hCG. Since this test doesn't measure the exact levels of hCG, it can't offer an estimate of gestation.
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When used correctly, home pregnancy tests are 97–99 percent accurate. A pregnancy blood test is done in a health care provider's office. It can find smaller amounts of HCG, and can confirm or rule out a pregnancy earlier than a urine test.
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Standard urine pregnancy tests will detect the HCG level when it reaches 20-50 milliunits/milliliters. If you take a test too soon (before you've missed your period), the levels of HCG may not be high enough to detect a pregnancy and it could cause a negative result, even though you're actually pregnant.
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Two Types of Tests Qualitative Blood Serum Test: This blood test can only confirm whether or not the pregnancy hormone, hCG, is present. It basically will give you a yes (you're pregnant) or a no (you're not pregnant) result. The qualitative hCG blood test is about as accurate as a home urine test.
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A positive at-home pregnancy test result should always be followed up with a doctor's appointment. Your doctor may give you a urine or blood test to confirm the results and monitor your hCG levels.
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If you don't have any hCG present in your blood, this doesn't necessarily mean you aren't pregnant. You may be too early in your pregnancy for your hCG levels to increase. HCG levels higher than 5 million international units per milliliter (mIU/mL) typically indicate pregnancy.
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Generally, most dye tests detect hCG in urine at levels between 25 mIU/mL and 50 mIU/mL. Digital tests, on the other hand, are less sensitive and may require more hCG — which is why you should wait until you've actually missed your period to try this type of test.
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As a general rule, home pregnancy tests are the best way of finding out if you are pregnant. However, in some rare cases, you may be pregnant, but not have enough HCG in your system – which means you won't get a positive reading.
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HCG can usually be detected by a urine test 12 to 14 days after conception. Home pregnancy tests can be purchased in a pharmacy or drugstore. They normally cost less than $20 and are easy to use.
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hCG Production If implantation has not taken place, a pregnancy test cannot detect hCG and will give you a negative result. So, implantation has to occur before a pregnancy can be recognized with a pregnancy test.
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If you are testing before the date of your expected period, you may be pregnant but your hCG levels are too low for the test to detect. A test may show positive if you have a chemical pregnancy (early pregnancy loss), an ectopic pregnancy, or a molar pregnancy, but this is not a false positive.
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Qualitative tests: qualitative tests give a simple yes or no answer by testing to see if the HCG hormone is present in the blood. Quantitative tests: quantitative HCG tests measure the amount of HCG in the blood, which can give an indication of how far along in the pregnancy a woman is.
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When used correctly, home pregnancy tests are 97–99 percent accurate. A pregnancy blood test is done in a health care provider's office. It can find smaller amounts of HCG, and can confirm or rule out a pregnancy earlier than a urine test. A blood test can detect pregnancy even before you've missed a period.
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hCG blood test is used to confirm pregnancy. Preparation: No fasting required. Stop biotin consumption at least 72 hours prior to the collection.