## How Accurate Is Pregnancy Test 3 Days Before Period
The accuracy of a pregnancy test taken 3 days before period, or any time after that, largely depends on the conditions in which the test was taken and the type of test being used. In general, the accuracy of home pregnancy tests increases the further past the expected start of a period the test is taken, as more of the pregnancy hormone, human chorionic gonadotropin (hCG), will have been produced.
### Accuracy of Home Urine Pregnancy Tests
Home urine pregnancy tests are designed to detect the hCG pregnancy hormone in the urine. Most of these tests claim to be about 99 percent accurate the day of a missed period, but can still deliver accurate results several days before a period is due.
The accuracy of these tests can vary depending on how soon after conception the test is taken. For example, some tests were found to display an accuracy of 99 percent one day before a missed period, while other tests have been found to be as low as 90 percent one day before a missed period.
It’s important to follow the instructions that come with the test and to read the results carefully. False-positive and false-negative results are possible.
### Professional Blood Tests
Blood tests, such as quantitative hCG estimates, are available to health care providers and are extremely accurate. Most of these tests are able to detect the hCG pregnancy hormone three days before a missed period.
### Key Takeaways
* Home pregnancy tests are said to be over 99 percent accurate from the day of a missed period, though accuracy levels can vary depending on the test and how soon after conception the test is taken.
* Professional blood tests are more accurate and are usually able to detect the hCG pregnancy hormone three days before a period.
* False-positive and false-negative results can occur with both home and professional tests.
What are the chances of getting a false negative on a pregnancy test 3 days before period?
The chances of getting a false negative on a pregnancy test 3 days before a period are very low. Most pregnancy tests are over 99% accurate when taken according to the instructions. However, if you are testing extremely early or if you took the test incorrectly, you may get a false negative result.
What causes a false negative on a pregnancy test 3 days before period?
A false negative on a pregnancy test 3 days before period can be caused by a variety of factors, including not taking the test according to the manufacturer’s instructions, not having high enough levels of hCG (human chorionic gonadotropin) in your urine to be detected, test sensitivity, incorrect testing time, not following storage and expiration instructions, diluting your urine sample, or the test being expired or defective.
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