What is Growth Hormone Deficiency?
The pituitary gland — a small, pea-sized gland located at the base of the brain — produces growth hormone (GH), a protein that plays a central role in normal childhood growth and physical development. When the pituitary gland produces insufficient amounts of GH, the condition is referred to as growth hormone deficiency (GHD).
Inadequate GH production can significantly impact a child's height trajectory and overall physical maturation. GHD may be:
- Congenital — present from birth, sometimes associated with structural abnormalities of the pituitary or hypothalamus
- Acquired — developing later in childhood, sometimes following a brain injury, tumor, infection, or radiation therapy to the head or brain
- Idiopathic — in many cases, no specific underlying cause is identified; this is the most common presentation
GHD is not a single uniform condition — its severity can range from partial to complete deficiency, and its effects on growth depend on the degree of deficiency and the age at which it develops.
Common Signs of GHD in Children
No single sign is diagnostic of GHD on its own. However, physicians look for a pattern of findings that — taken together — may suggest the need for further evaluation.
Slow Growth Rate
Children with GHD may grow less than approximately 2 inches (5 cm) per year after age 3. A slowing growth rate — even from a previously normal pace — can be an important early indicator.
Short Stature
Height that is significantly below peers of the same age and sex — typically below the 3rd percentile on standardized growth charts — is a common presentation associated with GHD.
Delayed Physical Maturation
Some children with GHD may show delayed tooth development, a bone age that lags behind their chronological age, and youthful or immature facial features relative to their peers.
Additional features that physicians may note during evaluation include:
🧪 Low IGF-1 Levels
Insulin-like growth factor 1 (IGF-1) is a hormone that reflects GH activity. Low IGF-1 levels in blood testing may suggest reduced GH secretion and often prompt further diagnostic workup.
🥾 Delayed Bone Age on X-ray
A hand and wrist X-ray can estimate skeletal maturity. Children with GHD often show a bone age that is noticeably younger than their actual age, indicating slower-than-expected skeletal development.
🤚 Small Hands and Feet for Age
Proportionally small hands and feet relative to the child's age are sometimes observed in children with growth hormone deficiency, alongside other signs of reduced growth.
⚧ Central Adiposity
Some children with GHD may show excess fat distribution around the midsection (central adiposity), even in the absence of obesity, as GH plays a role in body composition regulation.
How is GHD Diagnosed?
Diagnosing GHD requires a comprehensive evaluation by a qualified physician — it cannot be determined from a single blood test or measurement. Because growth hormone is secreted in pulses throughout the day, a random GH blood level is not a reliable diagnostic tool on its own and is generally not considered sufficient for diagnosis.
Evaluation typically involves a combination of the following assessments:
Growth Chart Review
A careful analysis of the child's growth history — including height measurements over time — helps identify patterns of deceleration or persistent short stature that may warrant investigation.
IGF-1 and IGFBP-3 Blood Tests
These blood markers serve as indirect indicators of GH activity. Low values for age may suggest GH insufficiency and guide next steps in the diagnostic process.
Bone Age X-ray (Hand/Wrist)
A simple X-ray of the left hand and wrist is used to estimate skeletal maturity (bone age). In GHD, bone age is often delayed relative to chronological age.
Growth Hormone Stimulation Testing
Stimulation tests involve administering agents that should prompt GH release, then measuring GH levels in the blood at timed intervals. This is considered the most definitive test for GHD and is performed under physician supervision.
MRI of the Pituitary Gland
In some cases, imaging of the pituitary gland and hypothalamus is recommended to identify any structural abnormalities that may be contributing to reduced GH production.
📋 Well-Established Research Background
GHD is one of the most extensively researched indications for growth hormone therapy in children. FDA-approved treatment options for pediatric GHD have been available since 1985, and physician-supervised therapy has been studied across large patient populations over several decades. Clinical studies suggest that children who begin treatment earlier — while growth plates remain open — may have more time to benefit from physician-guided intervention.
What Evaluation Looks Like at HGHKids.com
A Structured Path to Specialist Evaluation
HGHKids.com is an educational and referral platform that helps families across the country connect with licensed physicians who specialize in pediatric growth evaluation. Our process is designed to be straightforward and family-friendly.
Free Phone Consultation
Telemedicine Initial Visit
In-Person Evaluation
(Irvine, CA)
Physician-Supervised Care Plan
Learn more about what the evaluation process involves at our Growth Evaluation page, or call us at (949) 468-3120 to speak with our team.
When to Seek Evaluation
Parents are often the first to notice that something may be different about their child's growth. While short stature alone is not always cause for concern, certain patterns may indicate that a physician evaluation is warranted. Consider seeking evaluation if:
Your child's height has consistently fallen below the 3rd percentile on growth charts across multiple measurements over time.
Your child's growth rate has slowed significantly — particularly if they were previously growing at a normal pace and have recently decelerated.
Your child's pediatrician has raised concerns about growth patterns during a routine well-child visit or referred you to a specialist.
Time is a meaningful factor. Growth hormone therapy, if determined appropriate by a physician, is only possible while growth plates remain open — typically until mid-to-late adolescence. Prompt evaluation preserves more options.