Pregnancy testing checks for the presence of the pregnancy hormone, hCG or human chorionic gonadotropin, in your body. This hormone is produced within days after implantation, when the fertilized egg attaches to the wall of a woman's uterus. This usually happens about nine days after fertilization, with a range between 6-12 days. If you are pregnant, levels of hCG continue to rise rapidly, doubling early on every two to three days.

When Does a Home Pregnancy Test (HPT) Become Positive?

When does a home pregnancy test (HPT) become positive? ... read more »

Positive Pregnancy Test After Ovulation

When does the HPT become positive? ... read more »

When Does the Urine Home Pregnancy Test Become Positive

A urine home pregnancy test HPT usually becomes positive within a week or so after implantation, or around the time of your expected menstrual period. ... read more »

Home Pregnancy Test - When Positive

When does the home pregnancy test become positive? ... read more »

How Do Early Pregnancy Tests Work?

Pregnancy tests detect the pregnancy hormone hCG or human chorionic gonadotropin. Early urine pregnancy tests are usually positive about 12-14 days after ovulation. ... read more »

Pregnancy Tests - Introduction

How does a pregnancy test work? Pregnancy tests work by detecting human chorionic gonadotropin (hCG) is a hormone found only in pregnant women. There are both urine and blood pregnancy tests (HPTs) ... read more »

What Does the Blood Pregnancy Test Reveal?

A pregnancy test is run by the obstetrician during the first office visit to confirm the presence of the hCG hormone and confirm the pregnancy. ... read more »

Blood Test for Blood Type and Rh Status And Antibody Screen

At your first prenatal visit, th doctor will do several blood tests such as your blood type, whether it's type O, A, B, or AB, and the Rh status, whether it's Rh-negative or Rh-positive. ... read more »

HCG Drops In Early Pregnancy

hCG is the pregnancy hoirmone which is produced by the placenta as early as 3-4 days after implantation. ... read more »

Percentiles of Fetal Birth Weight

This table shows the percentiles of birthweights in grams by weeks of the pregnancy and gestational age. ... read more »

Top 5 Questions About Pregnancy Tests

Before jumping into a home pregnancy test or other form of pregnancy test, it is best to understand how they work and the best way to use them. ... read more »

When To Take A Pregnancy Test To Get Best Results

Despite the claim that home pregnancy tests are effective as little as two to three days before the first day of your next menstrual cycle, the human body does not always live up to this expectation. ... read more »

Fetal Testing and Monitoring

Fetal testing and monitoring are done to ensure that a fetus is healthy and growing at an acceptable rate. Fetal tests can help detect potential and actual problems. This gives the doctors an opportunity to treat the problem before it further develops, if at all possible. ... read more »

First Trimester Screen Test — Nuchal Translucency

The first trimester screening also known as nuchal translucency screening, or NT, is a prenatal test, ultrasound and a blood test that can help determine the likelihood of having Down's Syndrome ... read more »

How to Take a Home Pregnancy Test

It might seem simple, but there can be many factors influencing the accuracy of your urine home pregnancy test. Learn how to improve the accuracy of your urine pregnancy test. ... read more »

Home Pregnancy Tests: All Your Questions Answered

Taking a pregnancy test can be nerve-wracking ... and filled with questions! Here's everything you've always wanted to know about home pregnancy tests! ... read more »

Faint Positive Pregnancy Test

Have a faint positive pregnancy test? You either see a second line on the pregnancy test or you don't, but a faint line may not be what you think. ... read more »

When Is the Blood hCG Pregnancy Test Positive?

A blood pregnancy test usually becomes positive within 3-4 days after implantation, or several days before your expected menstrual period, when  hCG levels have reached a high enough level. ... read more »

Twins and hCG Levels

Does a fast rising hCG level always indicate that you are carrying twins? What else do hCG levels signify? Could it be twins or is there really just one baby in there? ... read more »

Search the Literature

Find published articles ... read more »

How Early Can Pregnancy Be Detected?

How early can pregnancy be detected? Learn all about pregnancy tests, false positives and false negatives, and how early you can take a pregnancy test! ... read more »

All About Amniocentesis

Amniocentesis is a procedure performed during pregnancy to examine a baby's chromosomes. Most often, an amniocentesis is done between 16-20 weeks of pregnancy (gestation). ... read more »

hCG not doubling

My hCG is not doubling, what's wrong ... read more »

Is The Pregnancy Test 99 Percent Accurate?

What does it mean when manufacturers claim their home pregnancy test HPT is 99% accurate? ... read more »

Twins When HCG Increasing Too Fast

In most pregnancies, the normal hCG rises is at least 60% over 48 hours. In twins it may rise much more, but  it's not possible to diagnose a twin pregnancy just from the hCG levels alone. ... read more »

How Soon Can I Take a Pregnancy Test?

Most current pregnancy test kits (sensitivity 25 mIU/ml) detect hCG in the urine as early as 3-4 days after implantation, though it often takes longer. ... read more »

Low and High hCG Levels

What do they mean? ... read more »

I Have Early Pregnancy Symptoms, Could I Be Pregnant?

If you think you may be pregnant and or you're experiencing some possible symptoms read here more about pregnancy diagnosis! ... read more »

hCG Levels and Pregnancy Testing

This article is about normal hCG pregnancy hormone levels implantation symptoms and bleeding and early pregnancy tests ... read more »

hCG Increasing Fast

There is no sufficient scientific evidence that with twins there is always a faster-than-usual rise in hCG. Normal hCG values can vary up to 20 times in normal pregnancies. ... read more »

hCG in Early Pregnancy

What is a normal hCG level? ... read more »

What Is a Glucose Challenge Test?

Before and during pregnancy there is usually a two-step approach to diagnosing diabetes: Glucose Challenge Test (GCT) and Glucose Tolerance Test (GTT). ... read more »

False Positive Pregnancy Test - Always Pregnant?

A positive pregnancy test usually means that you are pregnant. There are only a very few circumstances in which a false positive pregnancy test means that you are not pregnant . ... read more »

Early hCG Levels

When is the HPT positive? ... read more »

1. Product Reviews

Reviews of TTC and pregnancy items ... read more »

What Affects Normal hCG Levels In Pregnancy?

Human chorionic gonadotropin, more frequently referred to as hCG, is a hormone that is produced during pregnancy. ... read more »

Progesterone and Pregnancy Tests

Can progesterone supplements influence the test? ... read more »

Home Pregnancy Tests

Consumer Reports tested 18 pregnancy tests to find out which brands work best. Buy the top performers and follow their tips for the most accurate results. ... read more »

Pregnancy Tests

Which pregnancy tests are best? ... read more »

Positive Pregnancy Test: When Does it Happen?

A positive pregnancy test occurs only after the fertilized egg has first implanted into the uterus and then sends enough amounts of hCG the pregnancy hormone into your blood stream. ... read more »

Normal hCG Levels

When a blood pregnancy test is run, the hCG level will be reported to the obstetrician. This level will give the doctor a look into the age and the health of the pregnancy. ... read more »

Negative Blood hCG Pregnancy Test

Could I still be pregnant even though my blood hCG test was negative? ... read more »

Low and Slow Rising hCG Blood Levels in Pregnancy Test

When is the hCG titer in the blood considered to be too low and when is it considered to be slow rising? ... read more »

Feeling Pregnant With Negative Home Pregnancy Test (HPT)

I am feeling pregnant but got a negative home pregnancy test result, what should I do next? ... read more »

Early Home Pregnancy Test HPT

Several brands of home pregnancy tests claim to test for pregnancy before the missed period. These tests are more sensitive to hCG. ... read more »

False Positive False Negative Pregnancy Test

A false positive early pregnancy tests is a pregnancy test that is positive when in fact you are not pregnant. ... read more »

What Is A Phantom hCG And What Causes the False Positive Pregnancy Test

A "Phantom hCG" is a false positive blood pregnancy test. Patients with phantom hCG will have a persistently and not significantly rising positive blood pregnancy test despite a negative urine test. ... read more »

Positive Pregnancy Test Results

Positive pregnancy test results can show up any time before or after a missed period. Read below more about when the pregnancy test result first becomes positive. ... read more »

Normal hCG Levels in Pregnancy

Human chorionic gonadotropin hCG levels can vary significantly in pregnancy, and  there is a wide range of normal levels in early pregnancy. ... read more »

Pages