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What is this Growth Hormone?
Simply put, growth hormone is the main hormone that helps us grow taller, build stronger bones, and build muscle, especially during childhood. We call this Human Growth Hormone , or (HGH) or (GH) for short. It is produced by a small gland the size of a pea, located under our brain, in the middle of the head, called the pituitary gland . Think of it this pituitary gland as the "master gland" in our body. It controls many other hormone systems. We call this entire system the endocrine system . So, if for some reason this growth hormone (GH) is produced in the body in less than the required amount or sometimes in excess, various health problems can occur. Problems that can occur due to imbalanced growth hormone (GH) levels
If your child or you have these symptoms, your doctor may suggest a growth hormone stimulation test .| When GH levels are low (deficiency) |
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| When GH levels are elevated (hyperactivity) |
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At what point does a doctor refer you for this test?
This affects children and adults differently.As for children...
When you take your child for a routine checkup, that is, to their pediatrician , the doctor will measure their height, weight, and head circumference . These measurements are compared to growth charts for healthy children of that age.For example, if your child is significantly shorter than other children his age, or if his growth rate has suddenly slowed down, the doctor may be suspicious. That's when he will decide whether to have these hormone levels checked.
As for adults...
As an adult, if you continue to have one or more of the symptoms below, it is very important to see a doctor.- Lack of energy and constant fatigue
- Loss of muscle mass (feeling like your muscles are shrinking, even though you are full)
- Increased body fat (especially around the abdomen)
- Depression
- Decreased bone strength
How to prepare for the test?
There should be a little preparation before this test. This preparation is slightly different for a child and an adult.How to prepare a child
Since this is a test that takes several hours, it is important to prepare the child mentally.- Be careful with medications: The night before the test and on the day of the test, do not give any medication without the doctor's permission. Especially if your child is taking medication for a condition like ADHD , such as methylphenidate (Ritalin) , you should definitely tell the doctor about it. These can interact with medications like clonidine that are given during the test.
- Fasting: You will usually be asked to fast for a few hours before the test. Your doctor will explain the exact details to you.
- Help to avoid boredom:Since the test will take several hours, it's a good idea to bring something to keep your child occupied, such as a book, toy, or tablet . Also, dress them in comfortable clothing.
How an adult prepares
For an adult, your doctor may order several other hormone tests along with the GH Stimulation Test. For example, they may check levels of the hormones IGF-1 and IGFBP-3 , as well as hormones like cortisol , prolactin, and testosterone . You may also:- You will need to fast . Probably for 10-12 hours. Ask your doctor about this.
- Some medications and supplements may need to be stopped . For example, insulin, birth control pills, and herbal supplements (such as St. John's wort). Tell your doctor about all the medications you are taking.
- Avoid exercising 10 hours before the test, as it can alter hormone levels.
- If you have diabetes mellitus or obesity , tell your doctor about it as well, as these conditions can affect the results.
What happens during the test?
Don't be alarmed by this, the process is very simple. 1. Inserting an IV line: First, a trained nurse or technician will insert a small cannula (IV line) into a vein in your (or your child's) arm or hand. This is done to avoid pricking your finger with a needle each time, as blood will be drawn several times throughout the test. 2. First blood sample: After the cannula is inserted, a baseline blood sample is taken. 3. Giving the stimulating medication: Then, a medication that stimulates the pituitary gland to release GH hormone is given into the body through this cannula. The most commonly used medications are clonidine, arginine , or glucagon . Insulin was used in the past, but is now less commonly used for safety reasons. For adults, a liquid medication called macimorelin is also sometimes used. 4. Blood draw: After the medication is given, several blood samples are taken every 30 minutes for 2-3 hours. This is a very small amount, perhaps only about two teaspoons per day. 5. End of the test: After all the blood samples have been taken, the cannula is removed. You can then eat and drink. It is best to rest for the rest of the day. There are no major complications from this test. Some people may feel a little dizzy. There may be some bruising where the cannula was inserted.What do the results say?
Results are usually available within a few days. Your doctor will analyze these results and explain the situation.| Result | What it could mean |
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| If GH levels are lower than expected (Low Levels) |
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| If GH levels are higher than expected (High Levels) |
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The important thing is that these conditions can be treated if they are detected early. In children, these can sometimes correct themselves over time. If there is a GH deficiency, there is a chance that normal growth can be achieved with a simple treatment, such as a daily GH hormone injection.Therefore, if you or your child has these symptoms, do not panic or keep them to yourself, but see a qualified doctor immediately for advice.
💡 Take-Home Message
- Growth Hormone (GH) is a hormone essential for height and body development in children.
- Symptoms such as insufficient height in a child, delayed puberty, or excessive fatigue and loss of energy in an adult may be signs of a GH hormone problem.
- The Growth Hormone Stimulation Test is a safe test that stimulates the pituitary gland and measures how much GH the body produces.
- This test may require some preparation, such as fasting or stopping certain medications. Ask your doctor about this.
- If you suspect a problem like this, don't be afraid to see a doctor as soon as possible for advice. Early detection can lead to successful treatment.
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