Low IGF-1 in Children: Causes, Symptoms, Diagnosis, and Treatment
A low IGF-1 level can be concerning when a child is not growing as expected, but it does not automatically mean Growth Hormone Deficiency. IGF-1 must be interpreted in the context of age, growth pattern, puberty, nutrition, and overall health.
At HGH for Children, we evaluate low IGF-1 alongside Growth Velocity, Bone Age, growth charts, and other findings to help understand what may be affecting your child’s growth.
What Causes Low IGF-1 in Children?
Growth Hormone Deficiency
Low growth hormone production can lead to low IGF-1, short stature, reduced growth velocity, and delayed bone age. Low IGF-1 alone does not confirm GHD.
Constitutional Growth Delay
Children may grow more slowly and enter puberty later than peers. Delayed bone age and lower IGF-1 levels may also occur.
Delayed Puberty
Late puberty may result in lower IGF-1 levels and slower growth compared with children of the same age. Pubertal stage is important when interpreting results.
Nutritional Problems
Inadequate calories, protein, or essential nutrients can reduce IGF-1 levels and affect normal growth and development.
Chronic Medical Conditions
Conditions such as celiac disease, inflammatory bowel disease, and chronic kidney or liver disease may affect growth and lower IGF-1 levels.
Hypothyroidism
Low thyroid hormone levels may contribute to low IGF-1, reduced growth velocity, delayed bone age, and fatigue.
Signs and Growth Concerns Associated With Low IGF-1
Some children with low IGF-1 have no obvious symptoms other than slower growth. When low IGF-1 occurs alongside a growth concern, parents may notice:
- Short stature compared with peers
- Poor Growth Velocity
- Falling height percentiles
- Delayed growth spurts
- Delayed Bone Age
- Delayed puberty
- A child appearing younger or smaller than classmates
Can Low IGF-1 Affect Adult Height?
The effect on adult height depends on the reason IGF-1 is low. Children with Constitutional Growth Delay or delayed puberty may have additional time for growth because skeletal maturation is delayed. In contrast, untreated conditions that significantly impair Growth Velocity may affect height potential.
What Is Considered a Low IGF-1 Level?
There is no single IGF-1 value that is low for every child. IGF-1 normally changes throughout childhood and rises during puberty. Clinicians therefore use age- and sex-specific reference ranges and may consider an IGF-1 Z-score when interpreting results.
How Is Low IGF-1 Evaluated?
A pediatric growth evaluation usually begins with a detailed review of the child’s growth history.
Step 01
Growth Chart Analysis
Growth charts help clinicians assess height percentile, weight percentile, Growth Velocity, and changes over time. Mid-parental target height may also be considered to understand the child's expected genetic growth range.
Step 02
Laboratory Testing
Depending on the child's history and physical findings, testing may include IGFBP-3, thyroid studies, CBC, comprehensive metabolic panel, celiac screening, and other appropriate laboratory evaluations.
Step 03
Bone Age X-Ray
A Bone Age X-Ray can show whether skeletal maturation is consistent with chronological age. Delayed Bone Age can occur with Constitutional Growth Delay, Growth Hormone Deficiency, delayed puberty, and other growth conditions.
Step 04
Growth Hormone Testing
If Growth Hormone Deficiency remains a concern after the initial evaluation, Growth Hormone Stimulation Testing may be considered. This specialized test evaluates the body's ability to release growth hormone under controlled conditions.
Step 05
Pituitary MRI
A pituitary MRI provides detailed images of the pituitary gland and surrounding structures. It may be considered when there are confirmed hormone deficiencies, abnormal testing, severe growth failure, neurologic symptoms, or other findings.
When Should Parents Seek a Growth Evaluation?
Consider a professional growth evaluation if your child has:
- Persistently low IGF-1
- Poor Growth Velocity
- Significant short stature
- Falling height percentiles
- Delayed Bone Age
- Delayed puberty
- A possible hormonal or endocrine disorder
- Concerns about future adult height
An evaluation can help determine whether low IGF-1 reflects normal variation or an underlying condition.
Does Low IGF-1 Mean Growth Hormone Deficiency?
No. Low IGF-1 can support consideration of Growth Hormone Deficiency, but it does not establish the diagnosis. Children can have low IGF-1 for reasons unrelated to GHD, while some children with GHD may have an IGF-1 level within the laboratory reference range. Doctors consider height, Growth Velocity, family height patterns, Bone Age, puberty, nutrition, medical history, IGF-1, IGFBP-3, and other findings together. Additional testing may be recommended when appropriate.
What Is IGF-1?
IGF-1, or Insulin-Like Growth Factor 1, is a hormone produced primarily by the liver in response to growth hormone (GH). It plays an important role in childhood growth, including bone development, growth plate activity, and muscle development.
However, IGF-1 should not be interpreted by itself. Age, sex, pubertal stage, nutritional status, and the laboratory reference range can all influence the result.
How Is Low IGF-1 Treated?
There is no single treatment for low IGF-1 because treatment depends on the underlying cause.
Monitoring
Children with normal growth patterns and no concerning underlying condition may need continued growth monitoring and periodic reassessment.
Treating an Underlying Condition
If low IGF-1 is related to inadequate nutrition, hypothyroidism, celiac disease, or another medical condition, addressing that condition may improve growth-related findings.
Growth Hormone Therapy
Growth hormone therapy may be considered when Growth Hormone Deficiency is confirmed or when another medically appropriate, approved indication is present. Treatment is individualized based on the child's diagnosis, growth pattern, and overall health. A low IGF-1 result alone does not mean growth hormone treatment is necessary.
Medically Reviewed By
Dr. Devin Stone is a naturopathic doctor specializing in pediatric growth disorders, Growth Hormone Deficiency, Delayed Bone Age, Delayed Puberty, and Constitutional Growth Delay. He works with families nationwide to evaluate abnormal growth patterns and develop individualized growth support plans.
Medical References
- Pediatric Endocrine Society – Growth Hormone Deficiency Resources
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) – Growth Disorders Information
- MedlinePlus – Growth Hormone Deficiency in Children
- National Library of Medicine (PubMed) – IGF-1 Research
- Merck Manual – Growth Hormone Deficiency in Children
Why Families Choose HGH for Children
HGH for Children evaluates children with low IGF-1 and related growth concerns, including Growth Hormone Deficiency, Poor Growth Velocity, Delayed Bone Age, Delayed Puberty, Constitutional Growth Delay, Idiopathic Short Stature, and pituitary disorders.
We focus on the child’s complete growth picture, including growth history, physical development, Bone Age, and laboratory findings, rather than one result in isolation.
Frequently Asked Questions
Can a child have low IGF-1 and still be healthy?
Yes. Low IGF-1 can occur with Constitutional Growth Delay, delayed puberty, nutritional problems, or other factors. The result needs to be interpreted alongside the child’s growth and development.
Does low IGF-1 always mean Growth Hormone Deficiency?
No. Low IGF-1 is not diagnostic of Growth Hormone Deficiency. Additional clinical assessment and, when appropriate, Growth Hormone Stimulation Testing may be needed.
Can delayed puberty cause low IGF-1?
Yes. IGF-1 normally rises during puberty, so children with delayed puberty may have lower levels than expected for their chronological age.
What tests may be needed after a low IGF-1 result?
Depending on the clinical situation, evaluation may include growth chart analysis, Bone Age X-Ray, IGFBP-3, thyroid testing, nutritional or other laboratory studies, and Growth Hormone Stimulation Testing.
Can low IGF-1 affect my child's height?
It depends on the underlying cause. Some children with low IGF-1 have normal growth potential, while others may have an underlying condition that affects Growth Velocity and adult height.
Schedule a Growth Consultation
If your child has a low IGF-1 result or is not growing as expected, understanding the complete growth pattern is an important first step. HGH for Children can review growth history, Growth Velocity, Bone Age, pubertal development, and relevant laboratory findings to help determine appropriate next steps.
