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The Comprehensive Guide to Human Chorionic Gonadotropin (hCG)

What is hCG?

Human Chorionic Gonadotropin, or hCG, is a hormone integral to the early stages of pregnancy, produced by the developing placenta soon after fertilisation. While most commonly recognised as the key indicator in pregnancy tests, the significance of hCG extends far beyond this initial role, playing a crucial part in the sustenance of the pregnancy and even having implications outside of this context.


If you're looking to monitor your hCG, One Day Tests offers a precise blood test to track Human Chorionic Gonadotropin levels, ensuring comprehensive insight into your early pregnancy status and overall well-being.

Understanding hCG in Pregnancy

hCG is the hormone responsible for the positive signal on a pregnancy test, which can detect levels as low as 20-25mIU/mL. However, its function is not limited to confirming pregnancy. hCG is essential for the development of the placenta, which is vital for providing nutrients to the growing foetus. 


In terms of In-Vitro Fertilisation (IVF), hCG monitoring mirrors its role in natural pregnancy by confirming and tracking the pregnancy's development. 


Serial hCG tests can also sometimes be useful in guiding healthcare professionals in terms of arranging further tests throughout the process. 

In situations where a miscarriage or an
ectopic pregnancy is suspected, serial hCG measurements can provide invaluable information. An increase of more than 63% over 48 hours typically indicates a progressing pregnancy, whereas a drop of 50% or more suggests a failing pregnancy. If miscarriage occurs, hCG levels will usually take between 3-6 weeks to return to normal.

Monitoring hCG Levels

The production of hCG commences soon after the embryo embeds itself in the uterus, with its levels typically doubling every 48 to 72 hours during the initial phase of a healthy pregnancy. While hCG levels can fluctuate, they are generally found to be between 5 to 50 mIU/mL in the early stages of pregnancy. These levels tend to rise, reaching their peak between the 8th and 11th weeks, before settling to a consistent level for the remainder of the pregnancy.


There are instances when monitoring hCG levels through a blood test becomes essential. Monitoring of hCG levels, when deemed necessary, typically occurs every 48-72 hours, though recommendations may differ among individuals. Although urinary and blood tests for hCG aim to identify the same hormone presence, a blood test yields a specific numerical value, allowing for more precise tracking. This precision is crucial, as unchanged or decreasing hCG levels may indicate complications like ectopic pregnancies or miscarriages.


It's crucial to note that lower hCG readings early in pregnancy could indicate problems such as a miscarriage or fetal demise. However, it's also essential to recognise that hCG levels can vary significantly among individuals. In cases of miscarriage or ectopic pregnancy, symptoms like abdominal pain or bleeding are often present, accompanying the hCG level indications.

Broader Implications of hCG

While pregnancy is the most frequent reason for elevated hCG levels in women, exceptionally rare instances may hint at conditions such as trophoblastic disease or certain types of tumours. Elevated hCG can also stem from complications with the pituitary gland or the use of specific medications. Intriguingly, postmenopausal women may experience minor increases in hCG levels, though such rises are generally slight and seldom cause for alarm.


Should non-pregnant women exhibit significantly elevated hCG levels, it typically necessitates further investigation to pinpoint the root cause. Depending on the particular medical symptoms present, this could involve imaging techniques like CT scans or ultrasounds, or additional blood tests.


It's important to note that folic acid does not influence hCG levels, yet it plays an essential role in the early pregnancy stage for the development of the neural tube.

Dispelling Common Myths About hCG

There are several myths surrounding hCG. One common misconception is that hCG levels can indicate the fetus's sex, yet scientific research does not support this claim. Similarly, the idea that combining hCG with a low-calorie diet constitutes an effective weight-loss method is unfounded and can be potentially harmful.


hCG in Men


Men also have hCG in their bodies, albeit in small quantities, where it plays a crucial role in testosterone production. In certain medical scenarios, hCG is employed to enhance sperm count by stimulating the testicular cells to produce and release testosterone, thereby boosting sperm production. This treatment tends to be most effective when a low sperm count is attributed to reduced levels of the hormones FSH and LH, and its efficacy may be limited in addressing low sperm count arising from other causes. It's crucial to emphasise that any hCG treatment in men should be supervised by medical specialists.

Human Chorionic Gonadotropin Explained

In essence, the significance of hCG goes beyond the verification of pregnancy, encompassing the monitoring of placental and fetal growth and health. The careful observation and analysis of hCG levels can sometimes play a key role in a detailed strategy for managing reproductive health and related conditions. Furthermore, elevated hCG levels in women may signal issues unrelated to pregnancy, necessitating a thorough investigation to determine the cause.

Monitor Pregnancy With Our hCG Blood Test

Frequently Asked Questions

What affects hCG levels?

Development of the fetus is the commonest reason for changing hCG levels, but non-pregnancy reasons such as trophoblastic disease and various tumours can also cause rises in hCG.

Is there a difference between an hCG urinary test and an hCG blood test?

Blood tests can provide an accurate indication of hCG levels. Urinary hCG tests are sensitive to the presence of hCG but don’t provide a numerical value.

When does hCG start increasing in pregnancy?

hCG production begins shortly after embryo implantation and levels double approximately every 48 to 72 hours in a healthy pregnancy. Levels should double approximately every 48-72 hours.

What is a normal hCG level in women and men?

Normal hCG levels can vary in women, but during early pregnancy, they typically range from 5 to 50 mIU/mL. In men, levels are usually below 5 mIU/mL.

Does folic acid increase hCG levels?

Folic acid does not affect hCG levels.

How fast does hCG drop after miscarriage?

hCG levels will usually take between 3-6 weeks to return to normal in the case of miscarriage.

What causes hCG levels to rise if not pregnant?

A rising level of hCG can suggest problems such as trophoblastic disease, or certain tumours. Issues with the pituitary gland can also result in raised levels, as can certain medications. Interestingly, postmenopausal women can sometimes have slightly raised levels of hCG, but usually, any rise is minimal and rarely of any concern.

How quickly does hCG increase sperm count?

Occasionally hCG is used as a medical treatment to improve sperm count, acting on cells in the testes to promote the synthesis and release of testosterone. If effective, results are usually apparent within the first 3 months.

How often should you test for HGC if you are monitoring your pregnancy?

If hCG levels do require monitoring this is usually performed every 48-72 hours, although monitoring advice can vary from person to person.

Why is an hCG test important during IVF?

hCG can be useful not only in confirming an IVF pregnancy but also in monitoring progress. Serial hCG tests can also sometimes be useful in guiding healthcare professionals in terms of arranging further tests throughout the process.

What can interfere with hCG levels?

In the very early stages of pregnancy, results can be affected by drinking lots of water. This can dilute hCG to a degree that it is undetectable on urinary tests. Likewise, fertility drugs such as clomiphene can occasionally cause false positive results.

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