Quick Facts
- Sample: Blood
- Fasting: Fasting for at least 12 hours is required. Stop biotin consumption at least 72 hours prior to collection. Rest for at least 30 minutes prior to collection.
- Turnaround: 2-4 days. May take longer based on weather, holiday, or lab delays.
What This Test Measures
This test measures the level of Human Growth Hormone (HGH), also known as Somatotropic Hormone (STH) or GH, circulating in your blood. GH is a peptide hormone secreted by the pituitary gland that influences bone growth, metabolism, red blood cell production, and muscle mass.
Because GH is released in pulses throughout the day, with higher levels typically occurring during deep sleep, a single measurement reflects one point in this pulsatile pattern. Interpreting GH levels often involves looking at results over time rather than relying on one isolated value.
Benefits
- Measures your circulating Human Growth Hormone level
- Supports evaluation of possible GH deficiency
- Supports evaluation of possible GH excess
- Helps assess pituitary gland function related to GH secretion
- Can support monitoring of GH-related treatment over time
Who Is This Test For?
- Individuals experiencing decreased bone density
- Individuals experiencing persistent fatigue
- Individuals with adverse lipid changes, such as high cholesterol
- Individuals with reduced exercise tolerance
- Individuals with symptoms such as skin thickening, sweating, or joint pain
- Individuals with enlarged hands, feet, or facial bones
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What is the purpose of this hormone test?
This test measures the level of Human Growth Hormone (HGH) in your blood. GH is secreted by the pituitary gland and plays a role in bone growth, metabolism, and muscle mass. Measuring GH may help a healthcare provider evaluate pituitary function and assess for signs of GH deficiency or excess. This test measures a single circulating hormone and does not diagnose any condition on its own.
2. Who would benefit from this test?
This test may be appropriate for individuals experiencing symptoms associated with GH deficiency, such as decreased bone density, fatigue, adverse lipid changes, or reduced exercise tolerance. It may also be appropriate for individuals experiencing symptoms associated with GH excess, such as skin thickening, sweating, headaches, joint pain, or enlargement of the hands, feet, or facial bones.
3. When should I order this test?
You may consider ordering this test if you are experiencing symptoms related to possible GH deficiency or GH excess, or if a healthcare provider wants to evaluate pituitary function or monitor GH levels over time. This test does not replace a full medical evaluation.
4. How does this test differ from other hormone tests?
This test measures circulating Human Growth Hormone (GH) directly in the blood. It does not measure other pituitary hormones, hormone-binding proteins, or related endocrine markers. Because GH is released in pulses, this single measurement reflects hormone levels at the time of collection rather than a full picture of GH secretion patterns.
5. Do I need to fast before this test?
Yes. Fasting for at least 12 hours is required. You should also stop biotin consumption at least 72 hours prior to collection and rest for at least 30 minutes prior to collection.
6. How quickly will I get results?
Results are typically available in 2-4 days. Results may take longer based on weather, holiday, or lab delays.
7. How do I interpret the results?
Interpreting your GH result depends on factors such as your symptoms, medical history, and the timing of collection, since GH is released in pulses throughout the day. Because of this pulsatile pattern, a single result is often considered alongside other clinical information or repeated measurements rather than in isolation. An abnormal result does not automatically confirm a hormonal condition, and a normal result does not automatically rule one out. Discuss your results with a qualified healthcare provider for full interpretation.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
8. What should I do if my results are abnormal?
If your results fall outside the expected range, review them with a qualified healthcare provider. They can help determine whether additional evaluation or testing may be appropriate based on your individual health history. This test result alone does not provide a complete clinical conclusion.
9. How often should I get tested?
Testing frequency should be determined as directed by your healthcare provider, based on your individual symptoms and health history.
Pre test preparation
Fasting for at least 12 hours is required. Patients should stop biotin consumption at least 72 hours prior to the collection. Resting is also required for at least 30 minutes prior to collection.
