You’ve waited for years to take the grand leap into parenthood; now you’re brimming with excitement and anticipation as you look forward to your due date and the new little addition to your family.  One interesting way to pass the time is to check out an HCG doubling calculator to keep with your stats on this hormone’s level throughout the duration of your pregnancy and afterward.

Counting Down: Exploring HCG Doubling Calculators

An Overview of HGC’S Purpose during Pregnancy

This hormone plays a vital role in protecting the developing embryo in many different ways.  Its levels increase at conception and throughout the stages of pregnancy due to its production by the placenta.  HCG’S primary purpose is to first send messages to the endometrium to prepare for the fertilized egg, and then, during pregnancy, it protects the developing baby because it impedes the mother’s immune response.  This interference by the HCG hormone prevents the body from treating the developing baby as if it were a foreign antigen.  Therefore, when a pregnant woman possesses the “normal” levels of HCG, the embryo is very well-protected.  Furthermore, it regulates the production of progesterone, which is another protective action that benefits the developing embryo.  Usually, HCG levels double every 48 to 72 hours during the early stages of pregnancy, reaching the highest peak of concentration at around six weeks, and then decreasing at some point during the second trimester since the production of progesterone is no longer needed.  Once the baby has been delivered, then the HCG level drops down to “undetectable” within days—in very few cases, weeks.

The following is a general picture of HCG levels during all three trimesters of a pregnancy without complications.  Notice how much of a difference in each range, which says a lot about how levels can vary for each person:

  • Three weeks: 5 to 50 MIU/ml
  • Five weeks: 18 to 17,340 MIU/ml
  • Seven to eight weeks: 76,590 to 229,000 MIU/ml
  • Nine to twelve weeks: 25,700 to 288,000 MIU/ml
  • Thirteen to sixteen weeks: 13,300 to 254,000 MIU/ml
  • Seventeen to twenty-four weeks: 4060 to 165,400 MIU/ml
  • Twenty-five to forty weeks: 3640 to 117,000 MIU/ml

Why use an HCG Doubling Calculator?

With this information in mind, you might wonder what kind of purpose an HCG doubling calculator would serve.  First of all, these “calculators,” many of which can be found online, calculate doubling rates of the HCG hormone found in Beta samples obtained through blood tests.  So you would need to have results handy from two consecutive blood draws.  So the main idea behind utilizing a doubling calculator is to not only see how much your HGC level has doubled but also how quickly.  In general, according to a 2012 study conducted at the University Of Pennsylvania School Of Medicine, the level of HGC should have risen by 35% in a two-day time span.  (Anything lower than that, could suggest an ectopic pregnancy; however, only additional lab work along with an ultrasound and a doctor’s analysis can accurately confirm that possibility.)  Thus, the calculator which compares Beta test #1 with Beta test #2 can also give some valuable information to take with you to the next visit with your healthcare provider.

General Information on How the Calculator Works

The HGC calculators that are found online work in similar ways in that you would input the dates of the first and second  is hcg beta doubling calculator twins test along with the resulting measurements obtained from each.  This refers to how many milli-international units per milliliter, which is the standard unit of measure for the quantity of HCG in the bloodstream.  Once the dates and measurements are input into their corresponding fields, then the user presses the “Calculate” tab.  (Again, this set-up is very common for various hcg doubling time calculator calculators online.)  One calculator also gives the doubling time in days and even hours.

Features of Various Calculators

The following are some sites with HCG Calculators and some of their features.  Most of these are very similar to one another in regard the information required to perform that calculation, such as dates of blood tests and their results.  They also have similar disclaimers about the consulting a healthcare provider about abnormal symptoms and/or calculations provided by the site itself.  They also stress the superior accuracy of an ultrasound as compared to blood or urine tests.

There are many more doubling hcg calculator available online, but some of the more user-friendly include the following:

  • com—this site has a calculator, but one interesting trait about this site is that it requires information on the number of days beyond ovulation. You will also need to enter the number of hours in between blood tests.  There is also a chart tool under the calculator to compare your results with maximum, minimum, and average levels during their corresponding weeks of gestation.
  • com—before locating the doubling calculator toward the bottom of the page, you will find a lot of information about HCG levels during the different stages of pregnancy in the form of text and a table. At the bottom below the calculator, you will also find a chart to assist with interpreting the results.
  • com—instructions for filling out the fields are found right about them. Interestingly, this site lacks a “Reset” tab, unlike other sites.  There is also an explanation of HCG, its purpose and function during pregnancy and the difference between quantitative and qualitative blood tests.
  • com—right above the calculator are brief but detailed instructions for entering the necessary data into the fields. Below the calculator, is a chart detailing ranges of Beta HCG levels at the corresponding number of weeks of gestation to allow for interpretation of the calculated solution.  At the foot of the page, you can also find the sources of this information.
  • com—this calculator, located at the top of the page, has fields for inputting dates for the first and second Beta tests, the values for each one, and a “Calculate” and “Reset” tabs. Underneath those tabs, you will also find a field labeled “Calculated doubling time (half-life) is:” Below the calculator is an explanation of how to interpret its results and a list of links to articles with more information about pregnancy.
  • com—this site has a large calculator that takes up just a little over half of the page. There are no instructions, just simply the fields for the first and second Beta tests, the number of days past ovulation, and the number of hours in between tests. Underneath is the “Calculate” and “Reset” tabs.  Underneath is a section on Frequently Asked Questions on HCG levels during the various stages of pregnancy and charts.

As you can see there are many sources of information out there that can give you an idea about how well your pregnancy is progressing, but of course you should rely more on consistent check-ups with your doctor.