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Normal IGF-1 level for a 30-year-old man
Hello Doctor,
I am a 30-year-old male.
What is the normal IGF-1 level for my age?
Please tell:
Normal reference range
What is low or high
What's most common range in this age
Common causes of low IGF-1
Thank you.
Most individuals fall between: 150–250 ng/mL
Common causes of LOW IGF-1 (guideline-listed)
A. GH-related
Adult Growth Hormone Deficiency (AGHD)
Hypothalamic–pituitary disease
Post-pituitary surgery or radiotherapy
B. Non-GH causes (important per guidelines)
Malnutrition / low protein intake
Chronic liver disease (very important – IGF-1 is liver-derived)
Poorly controlled diabetes mellitus
Hypothyroidism
Chronic kidney disease
Chronic inflammatory/systemic illness
C. Physiological / functional
Obesity (GH resistance)
Severe stress
Aging
Poor sleep
Answered
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Low IGF-1 does not always mean growth hormone deficiency. Common causes include:
• Poor sleep or chronic sleep deprivation
• Low protein or calorie intake
• Chronic stress or overtraining
• Hypothyroidism
• Poorly controlled diabetes
• Liver disease
• Obesity or metabolic syndrome
• Aging-related decline
Next Steps
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Answered
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