Results: First Response Early Result had an analytical sensitivity of 6.3 mIU/mL, which was estimated to detect greater than 95% of pregnancies on the day of missed period. The sensitivity of Clearblue Easy Earliest Results was 25 mIU/mL, which indicated detection of 80% of pregnancies.
These tests are way more sensitive than urine tests , so they can detect a pregnancy almost immediately after conception. (This is ideal for women who need to discontinue certain medications as soon as they learn they’re pregnant, for example).
Pregnancy Test Sensitivity
|Sensitivity Chart Pregnancy Test Brand||Sensitivity (or the hCG threshold at which a positive result is indicated). The lower the number, the higher the test sensitivity.|
|e.p.t. Certainty Digital Test||40 mIU/ hCG|
|Fact Plus Pregnancy Test||40 mIU/ hCG|
|Clearblue Digital||50 mIU/ hCG|
Data on file. The pregnancy hormone increases rapidly in early pregnancy and Clearblue Digital Pregnancy Test can be used as early as 5 days before the missed period (4 days before the expected period).
Yes, it is possible. Getting a negative result doesn’t mean you’re not pregnant, it may just mean your hCG levels are not high enough for the test to detect the hormone in your urine. Also, if you’re testing very early, your test may only detect hCG in your urine in the morning when it’s most concentrated.
For example, tests claiming 25 mIU /ml sensitivity were declared to be > 99 % accurate from the day of the expected period and capable of detecting pregnancy up to 4 days before the expected period. These tests are likely to be correct, providing the test is always able to detect 25 mIU /ml of hCG in every urine sample.
Most home pregnancy tests are reliable, for example Clearblue’s tests have an accuracy of over 99% from the day you expect your period, and while it’s possible a test showing a negative result is wrong , particularly if you’re testing early, getting a false positive is extremely rare.
Pregnancy Tests It’s too early to take a home pregnancy test in week 3 . But, by the middle or later part of next week , you might be able to detect the pregnancy hormone hCG in your urine with a sensitive early test .
One kit, the First Response Early Result Pregnancy Test, emerged as the most reliable and sensitive test. “It detected hCG at concentrations as low as 6.5 mIU/ml (thousandths of an International Unit per milliliter) – that’s almost sensitive enough to detect any pregnancy soon after implantation,” CR wrote.
A newly pregnant woman will have around 25 mIU of hCG at 10 days past ovulation , 50 mIU at 12 days past ovulation and 100 mIU at around two weeks past ovulation . The “earliest” pregnancy tests available are calibrated to detect hCG at the 20 mlU/ml level.
Standard hCG levels
|Pregnancy week||Standard hCG range|
|3 weeks||5–50 mIU/mL|
|4 weeks||5–426 mIU/mL|
|5 weeks||18–7,340 mIU/mL|
|6 weeks||1,080–56,500 mIU/mL|
hCG levels can usually be detected in the urine about 10 days after conception. If you take a urine pregnancy test fewer than 10 days after conception, the at-home tests might give a “false negative” response. This means it will show that you are not pregnant when you actually are.
Walk your fingers up the side of her abdomen (Figure 10.1) until you feel the top of her abdomen under the skin. It will feel like a hard ball. You can feel the top by curving your fingers gently into the abdomen . Figure 10.1 With the woman lying on her back, begin by finding the top of the uterus with your fingers.
Digital tests take the guesswork out of analyzing a pregnancy test , but they are not necessarily more accurate . These and many other pregnancy tests will say that they can detect pregnancy days before your first period.
The takeaway If you’re drunk or you’ve been drinking and suspect that you’re pregnant, the best approach is to wait until you sober up before taking a pregnancy test . It’ll be easier to follow the instructions, and you’ll be able to face the results with a clear head. But rest assured, alcohol won’t change the results.