Wondering how your hCG levels are changing during pregnancy? Simplify tracking with the help of the hCG calculator. By entering a few simple inputs, get the hCG difference, doubling time, and daily increases to have a clear picture of pregnancy progression.
HCG is an acronym for human chorionic gonadotropin. This hormone is formed by cells in the placenta during pregnancy and helps to indicate a pregnancy. After 11 days of conception, it is detectable by a blood test, and about 12-14 days after conception by a urine test.
When the egg gets fertilized, the production of the HCG hormone starts. Its level starts increasing till the 12th week of the pregnancy. This is the peak point and after that, it starts decreasing till the end of the pregnancy period.
It helps the doctors in predicting how far along a pregnant woman is and helps to check how well the pregnancy is going on.
During pregnancy, all the weeks have a specific HCG value as shown below:
| Gestational age | hCG blood levels |
| Not pregnant - negative | Less than 5 mlU/ml |
| 3 weeks | 5 to 50 mlU/ml |
| 4 weeks | 5 to 426 mlU/ml |
| 5 weeks | 18 to 7340 mlU/ml |
| 6 weeks | 1080 to 56,500 mlU/ml |
| 7 to 8 weeks | 7650 to 229,000 mlU/ml |
| 9 to 12 weeks | 25,700 to 288,000 mlU/ml |
| 13 to 16 weeks | 13,300 to 254,00 mlU/ml |
| 17 to 24 weeks | 4060 to 165,500 mlU/ml |
| 25 to 40 weeks | 3640 to 117,000 mlU/ml |
Source: parents.com.
Here’s what you need to know:
According to Dr. Matthews:
“During 4 to 6 weeks of the pregnancy, the hCG level should double every 48 hours. If it does not happen, then recheck it after another two days as it can show a failing pregnancy or a PUO (pregnancy of unknown origin)”
The hCG doubling time is crucial, indicating:
To calculate the doubling time, use the following formula:
\(T_2 = \dfrac{T}{Log_2(\dfrac{hCG_2}{hCG_1})}\)
Where:
Suppose you have two hCG measurements:
Now, let's calculate the doubling time using the formula:
Solution:
Put the given values in the doubling time formula:
\(T_2 = \dfrac{T}{Log_2(\dfrac{hCG_2}{hCG_1})}\)
\(T_2 = \dfrac{2}{Log_2(\dfrac{300}{100})}\)
\(T_2 = \dfrac{2}{Log_2(3)}\)
\(T_2 = \dfrac{2}{1.585}\)
\(T_2 = 1.26\ days\)
Skip the hassle of manual calculations and turn to this hCG calculator. gain clarity on your pregnancy's progress. Determine the doubling times, identify issues early, consult with professionals, and have the best care during pregnancy.
A low hCG level can indicate various factors. Rechecking within 48-72 hours is crucial to monitor changes. Possible indications include:
A high hCG does not indicate any problem with the pregnancy, if a woman has a high hCG it points towards:
When the hCG level crosses 6,000 mIU/ml, then it may double in more than 4 days. Meanwhile, you can expect the stopping of hCG rise between the 8th and 11th week of your pregnancy. At this time the hormones reached their peak value.
In case of a miscarriage, hCG levels start decreasing from previous values. For instance, a baseline level of 120 mIU/mL that dropped to 80 mIU/mL two days later shows that the body is not providing the necessary hormones for the growth of the embryo.
For singletons, the hCG range is 5 – 397, and for twins, the range is 48 – 683.
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| - | n | % | Median | Range |
| Viable pregnancies | 459 | 59.1 | 126 | 5 683 |
| Singletons | 362 | 47 | 115 | 5 397 |
| Twins | 96 | 12 | 201 | 48 683 |
| Triplets | 1 | 0.1 | 317 | 317 |
| Non-viable pregnancies | 315 | 40.9 | 31 | 5 268 |
| Biochemical | 154 | 20 | 18 | 5 81 |
| Ectopic | 20 | 3 | 35 | 5 144 |
| Miscarriages, all | 138 | 17.6 | 60 | 5 268 |
| Miscarriages, late | 5 | 0.6 | 96 | 74 116 |
| Hydatidiform mole | 2 | 0.3 | 99 | 39 160 |
