Growth hormone testing

Overview

Growth hormone testing is a group of blood tests that measure the amount of growth hormone (a chemical messenger that controls growth and metabolism) in your body. These tests help doctors figure out if your pituitary gland (a small gland at the base of your brain) is making too much or too little growth hormone.

Growth hormone testing is not a routine test. It is only done when a doctor suspects a growth hormone disorder based on your symptoms or your child’s growth pattern.

This test is used for children who are much shorter or taller than expected for their age, and for adults with symptoms that might be caused by too much or too little growth hormone, such as extreme tiredness, muscle weakness, or changes in facial features.

Symptoms

Common symptoms

• In children: slower growth compared to other children of the same age, shorter height
• In adults: feeling very tired, weaker muscles, increased body fat around the belly, feeling emotional or depressed

Symptoms in children

• Being much shorter than other children of the same age and gender
• Delayed puberty (slower development of secondary sex characteristics)
• A younger-looking face and a high-pitched voice that doesn't deepen normally

Symptoms in older adults

• Loss of muscle strength and bone mass (osteoporosis)
• Increase in body fat, especially around the waist
• Lower energy and reduced exercise tolerance

Causes

Main causes

• A benign (non-cancerous) tumor on the pituitary gland that makes too much growth hormone
• Damage to the pituitary gland from an injury, infection, or radiation treatment
• Genetic conditions that affect how the body makes or uses growth hormone

Risk factors

• A family history of pituitary tumors or growth hormone disorders
• A head injury or brain surgery that might have affected the pituitary gland
• Radiation therapy to the head or neck area

When to see a doctor

See a doctor urgently if:

• If you or your child has a sudden, severe headache or changes in vision
• If you notice a rapid change in your child’s growth pattern that seems unusual

Book a routine appointment if:

• If your child is significantly shorter than other children their age and you’re concerned about their growth
• If you have persistent symptoms like extreme tiredness, muscle weakness, or changes in body shape without a clear cause

Diagnosis

A doctor will first talk with you about your or your child’s symptoms, medical history, and growth patterns. If a growth hormone problem is suspected, blood tests are ordered to measure growth hormone levels. Sometimes several tests are needed because growth hormone naturally rises and falls throughout the day.

Tests that may be done

• Blood test for insulin-like growth factor 1 (IGF-1), which gives a picture of overall growth hormone activity
• Growth hormone stimulation test: you get a medicine (usually by injection or drink) that should make your pituitary release growth hormone; then blood is taken at intervals to see how your body responds
• Growth hormone suppression test: used when too much growth hormone is suspected; you drink a sugary liquid and blood is taken to see if growth hormone levels drop as they should

What to expect at your appointment

You may need to fast (not eat or drink anything except water) for about 8-12 hours before the test. A healthcare professional will insert a small needle into a vein in your arm to take a blood sample. For certain tests, you might need to stay for a few hours so several blood samples can be taken. The procedure is similar to a regular blood draw and usually causes only mild discomfort.

Treatment

Treatment for a growth hormone disorder depends on whether the body is making too much or too little growth hormone, and what is causing the problem. The goal is to restore hormone levels to a normal range and manage any symptoms.

Self-care at home

• Follow a balanced diet rich in protein, fruits, and vegetables to support overall health
• Get regular exercise appropriate for your age and ability (ask your doctor before starting a new exercise plan)
• Keep all follow-up appointments with your healthcare team to monitor your progress

Medical treatments

If the body is not making enough growth hormone, a doctor may prescribe synthetic growth hormone (given as a daily injection) to replace what is missing. If there is too much growth hormone (often from a pituitary tumor), medications that block growth hormone production or action may be used. These are always prescribed by a specialist and require regular monitoring. Never take over-the-counter supplements labeled as 'growth hormone' without your doctor’s approval.

When is surgery considered?

If a pituitary tumor is causing the hormone imbalance, surgery to remove the tumor may be recommended. This is usually done by a neurosurgeon through the nose (transsphenoidal surgery).

Living with this condition

With proper treatment, most people with growth hormone disorders lead a normal life. You will need to take medications as prescribed and see your endocrinologist regularly to adjust doses and check for side effects. Keep a log of any symptoms you notice and share them with your doctor.

Lifestyle tips

• Get enough sleep and manage stress through relaxation techniques like deep breathing or meditation
• Avoid smoking and limit alcohol intake, as these can affect hormone balance
• Stay active – regular exercise can help improve strength, mood, and overall well-being

Diet and exercise

Eat a diet that includes plenty of fruits, vegetables, whole grains, and lean protein. Stay hydrated and limit sugary drinks. Exercise, such as walking, swimming, or light resistance training, can help build muscle and bone strength. Always check with your doctor before starting a new exercise program, especially if you have any heart or joint problems.

Mental health and emotional wellbeing

Hormone imbalances can affect your mood and energy levels. It is common to feel frustrated, anxious, or depressed. Talk to your doctor if you are struggling emotionally – they can refer you to a counselor or support group. You are not alone, and getting emotional support is an important part of treatment.

Prevention

Most growth hormone disorders cannot be prevented because they are caused by tumors or genetic factors. However, monitoring growth in children and recognizing symptoms early can lead to prompt diagnosis and treatment, which can prevent complications.

Vaccines

There is no vaccine for growth hormone disorders.

Screening programmes

Routine screening for growth hormone problems is not recommended for the general public. Testing is only done when symptoms suggest a problem.

Complications

If left untreated

• In children: permanent short stature (if growth hormone deficiency is not treated) or excessive height and joint problems (if too much growth hormone)
• In adults: weakened bones (osteoporosis), increased risk of heart disease and diabetes (from too little or too much growth hormone)
• In cases of acromegaly (too much growth hormone): high blood pressure, heart muscle enlargement, and vision problems from a pituitary tumor

Long-term outlook

With the right treatment, most people with growth hormone disorders see significant improvement in their symptoms and quality of life. Children who receive treatment early often reach a normal adult height. Adults can regain energy, muscle strength, and bone health. Your healthcare team will work closely with you to find the best treatment plan and monitor your progress over time.

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