Lab test
SHBG (Sex Hormone Binding Globulin) Levels Blood Test
Below is a plain-language overview of the shbg (sex hormone binding globulin) levels blood test. This blood test measures the amount of sex hormone-binding globulin (SHBG) in your body. SHBG is a protein that binds to certain sex hormones.
What this test is
Sex hormone-binding globulin (SHBG) is a protein produced by the liver that binds to sex hormones like testosterone and estrogen. Measuring SHBG levels helps understand how much of these hormones are available to be used by the body's tissues.
What it measures
- Sex Hormone Binding Globulin (SHBG) — a protein that binds to sex hormones
What the test involves
This test is performed on a blood sample. A healthcare professional will draw blood from a vein in your arm using a needle.
Why it is often ordered
Clinicians may order this test to help evaluate hormone imbalances, particularly those related to testosterone or estrogen. It can provide insight into conditions affecting hormone production or regulation.
Preparation
You should follow the specific preparation instructions provided by the laboratory. This may include fasting or avoiding certain medications before the blood draw.
How results are reported
Results are typically available within a few business days and will be reported to your clinician. Reference ranges, which indicate what is considered typical, vary between laboratories.
Before you go
- Fasting requirements
- Medication restrictions
- Specimen collection time
FAQ
Frequently asked questions
What does SHBG do?
SHBG is a protein that binds to sex hormones, primarily testosterone and estrogen, in the bloodstream. By binding to these hormones, SHBG influences the amount of free, or unbound, hormone available for your body to use.
Why are SHBG levels important?
SHBG levels can reflect the balance of sex hormones in your body. Abnormal levels may be associated with various health conditions, and understanding SHBG helps in interpreting other hormone test results.
Can certain medications affect SHBG levels?
Yes, various medications can impact SHBG levels. For example, some hormonal therapies, birth control pills, and certain other drugs may alter SHBG concentrations.
How do SHBG levels differ between men and women?
Generally, men tend to have higher SHBG levels than women. However, reference ranges are established by laboratories and account for these differences.
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