First Response™

The Science Behind the Accuracy of Pregnancy Tests and Knowing Sooner

The most sensitive at-home pregnancy tests should be able to detect pregnancy before the first day of your missed period and should be able to identify more than one form of the pregnancy hormone hCG. These tests should be able to detect not only hCG but also a variant of the pregnancy hormone, hyperglycosylated hCG or hCG-H.

The cell that originates when a fertilized egg is implanted in the uterine wall initially secretes the pregnancy hormone variant hCG-H. As such, this hormone is actually produced in the earliest stages of pregnancy before the primary pregnancy hormone, hCG, which is produced immediately following implantation by a different set of cells.

The FIRST RESPONSE™ Early Result Pregnancy Test can detect the pregnancy hormone earlier than any other at-home pregnancy test with unsurpassed accuracy.  Enhanced FIRST RESPONSE™ technology detects lower levels of hCG. The more sensitive a pregnancy test is, the earlier you will receive information about your pregnancy status. It is important to note that some women may not have detectable amounts of pregnancy hormone in their urine until after the missed period. This is because hCG levels vary between women, and because some women sometimes have difficulty predicting the exact date of their next period.

Why Early Pregnancy Detection Matters1

  • The first few weeks of pregnancy are critical to fetal development, so early prenatal care is important to healthy birth weight and baby survival.

  • The sooner you know you’re pregnant, the sooner you can begin making healthy choices for yourself and your baby that include diet, nutrition and limiting your exposure to hazards.

Importance of Earlier Pregnancy Detection



Related Links
Early Result Pregnancy Test >>
Rapid Result Pregnancy Test >>
Gold™ Digital Pregnancy Test >>
How Pregnancy Tests Work >>
Due Date Calculator >>

March Of Dimes
Visit MarchofDimes.com 2 for more on conception, pregnancy, and a healthy nine months.
1 Women’s Health Journal November ’09 Publication: Embryonic Development and Pregnancy Test Sensitivity
2 March of Dimes does not endorse specific products or brands.