Precision of Home Pregnancy Tests


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Many home pregnancy tests claim to be 99 percent accurate. However, home pregnancy tests differ in the ability to diagnose pregnancy in women who have recently missed a period. If you have a negative test but think you might be pregnant, repeat the test one week after your missed period or talk to your health care provider. Many home pregnancy tests typically maintain a 99% accuracy rate or better. The problem lies in the fact that these tests also imply that this accuracy could be expected if you take the test as early as the day of a missed period, but that’s not what they’re testing for in the laboratory to get their 99% accuracy rate.

Some pregnancy tests can spot hCG before you miss a period. But the results will be more accurate if you wait until the first day of a missed period. Results may also be more accurate if.

What is the accuracy of a home pregnancy test? The accuracy of pregnancy tests needs a standard to compare. One can say that home pregnancy tests are 99% accurate on the day of missed period. The First Response Pregnancy Test is the most accurate pregnancy test.

It can detect pregnancy six days before missed period. The accuracy of a home pregnancy test depends on: How you take the test; When you take the test; Test sensitivity; Certain rare types of pregnancies (such as ectopic pregnancies) or medical conditions can also affect home pregnancy test accuracy. Many online retailers offer strip home pregnancy tests at a very low cost per test. If a person cannot afford these tests or has concerns about privacy, a free health clinic may be a viable option.

Urine home pregnancy tests are about 99% accurate. Blood tests are even more accurate than this. Waiting at least a week after a missed period may give you the most accurate result. Results. At-home pregnancy tests work by detecting the hormone human chorionic gonadotropin (hCG) in your urine. the tests were only 46% to 89% accurate.

In one study, pregnancy tests indicated a positive result only 80% of the time on day 28 of the woman’s menstrual cycle. Why, try a homemade test that’s made its way into local folklore, of course! See, today’s popular home pregnancy tests — readily available at drugstores and proven to detect pregnancy with a.

Clearblue: The manual tests give a positive to 56 percent of people who are actually pregnant four days before a missed period, and the digital gives a.

List of related literature:

About 20 percent of women obtaining negative results in home pregnancy tests may simply have miscalculated the date of their expected period or may not have quite enough hCG in their urine to yield a positive result.

“The New Harvard Guide to Women's Health” by Karen J. Carlson, Stephanie A. Eisenstat, Stephanie A. Eisenstat, M.D., Terra Diane Ziporyn, Alvin & Nancy Baird Library Fund, Harvard University. Press
from The New Harvard Guide to Women’s Health
by Karen J. Carlson, Stephanie A. Eisenstat, et. al.
Harvard University Press, 2004

The manufacturers of home pregnancy tests claim that a woman can test her urine on the first day of her missed period or before and that she will obtain results that are 99% accurate.

“Alters and Schiff Essential Concepts for Healthy Living” by Jeff Housman, Mary Odum
from Alters and Schiff Essential Concepts for Healthy Living
by Jeff Housman, Mary Odum
Jones & Bartlett Learning, LLC, 2015

One week after conception there’s hCG in your urine, but it’s not enough for the HPT to pick up—which means that if you test seven days before your expected period, you’re likely to get a false negative even if you’re pregnant.

“What to Expect When You're Expecting” by Heidi Murkoff, Sharon Mazel
from What to Expect When You’re Expecting
by Heidi Murkoff, Sharon Mazel
Workman Publishing Company, 2008

Though some hCG is in your urine a week after conception, it’s not likely to be enough to register on the HPT – which means that if you test 7 days before your expected period, you’re likely to get a negative result even if you’re pregnant.

“What to Expect: Before You're Expecting” by Sharon Mazel, Heidi Murkoff
from What to Expect: Before You’re Expecting
by Sharon Mazel, Heidi Murkoff
Simon & Schuster UK, 2010

A pregnancy test is most accurate if the testing is done using the first urine of the morning because HCG accumulates overnight in urine stored in your bladder.

“The Harvard Medical School Family Health Guide” by Anthony L. Komaroff, Harvard Medical School
from The Harvard Medical School Family Health Guide
by Anthony L. Komaroff, Harvard Medical School
Simon & Schuster, 1999

However, about 10% of women who are pregnant still get the inaccurate test result that they are not pregnant.

“Health & Wellness”
from Health & Wellness
, 2008

The results become more accurate with time, with the average early detection being around 1 week after a missed period.

“The SAGE Encyclopedia of Surveillance, Security, and Privacy” by Bruce A. Arrigo
from The SAGE Encyclopedia of Surveillance, Security, and Privacy
by Bruce A. Arrigo
SAGE Publications, 2016

Variations in time of implantation, with only 90% of pregnancies having implanted by the first day of the expected period, mean that even the most sensitive assay will fail to detect some preimplantation pregnancies, casting doubt on claims of home pregnancy tests to be 99% accurate by this time.

“Primary Care Medicine: Office Evaluation and Management of the Adult Patient” by Allan H. Goroll, Albert G. Mulley
from Primary Care Medicine: Office Evaluation and Management of the Adult Patient
by Allan H. Goroll, Albert G. Mulley
Wolters Kluwer Health/Lippincott Williams & Wilkins, 2009

Professional pregnancy tests are based on urine or blood serum levels of hCG, and they are more accurate.

“Introduction to Maternity and Pediatric Nursing E-Book” by Gloria Leifer
from Introduction to Maternity and Pediatric Nursing E-Book
by Gloria Leifer
Elsevier Health Sciences, 2018

They are accurate before the first missed menstrual period but are currently seldom used (Pagana & Pagana, 2009).

“Maternal-Child Nursing E-Book” by Emily Slone McKinney, Susan R. James, Sharon Smith Murray, Kristine Nelson, Jean Ashwill
from Maternal-Child Nursing E-Book
by Emily Slone McKinney, Susan R. James, et. al.
Elsevier Health Sciences, 2017

Oktay Kutluk

Kutluk Oktay, MD, FACOG is one of the world's foremost experts in fertility preservation as well as ovarian stimulation and in vitro fertilization for infertility treatments. He developed and performed the world's first ovarian transplantation procedures as well as pioneered new ovarian stimulation protocols for embryo and oocyte freezing for breast and endometrial cancer patients.

Mail: [email protected]
Telephone: +1 (877) 492-3666

Bibliography: oktay_bibliography

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  • man my periods is delayed for 5 days… last month same thing happened.. periods delayed for four days and the fifth day it started bleeding with heavy pain.. usually i dont have pain.. this month till now i dont have periods.. and when i took card test it came out negative and delaysd for 5 days… is their any possiblity in changing the result?? mam plzz reply

  • mam if periods are delayed like they were to b on 17 sep but today is 10 oct till nw there is no sign of periods and if urine test is done two times and both times it is negative then what to do??

  • mam is that possible that pregnancy kit test is wrong when it’s showing positive. I am asking all this because we had unprotected sex when she got her cycle n then she took contraceptive pill within 72 hours but after dat she suffers from cold and typhoid, so is there any effect of heavy antibiotics on her pregnancy test?? Because she still taking these cold and fever tabs.

  • good day,Ma’am I just my mentration period delayed for 1,month and 3,weeks,I use Pregnancy test 2x bt the result is negative,
    only 1 times me and my boyfriend having sex and we use widrawal,I just little botherd about wat happening in my body,hope u can help me about this.
    tnx a lot

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  • Hi dear, I actually tested positive at home then the next day I went for blood test and they said positive and okay, but I’m still in doubt cos I’m not actually feeling any thing now after the 2wk wait, though I felt so much pain and few sporting which I don’t have any more. My body is like back to normal but a little bit of breast tenderness,which sometimes gets more painful.Does it mean I’m actually pregnant? Thanks