Testosterone, Serum (Mass Concentration)
This test measures the amount of testosterone, a key male sex hormone, in your blood serum. Testosterone plays a role in muscle and bone development, red blood cell production, and sexual function.
["Your testosterone levels help determine if you have normal hormone function or conditions affecting hormone balance."]
Key facts at a glance
- LOINC
- 70239-9
- Short code
- Testost SerPl DL<= 3.47 pmol/L-sCnc
- Synonyms
- Testost SerPl DL<= 3.47 pmol/L-sCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 0
- Ref high
- 100
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- detection-limit-pmol-l
- CPT
- 83721
- SNOMED
- 113079007
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you have symptoms like low libido, fatigue, or changes in body hair. It’s also used to evaluate conditions such as hypogonadism (low testosterone), infertility, or to monitor hormone therapy.
What to Expect Before the Test
No special preparation is needed, but avoid alcohol for 24 hours before the test. Wear comfortable clothing for blood draw, as it’s typically done in a lab or clinic.
What the Test Results Mean
Results help assess hormone levels but aren’t a standalone diagnosis. Your provider will interpret results in relation to your symptoms and medical history. Abnormal levels may indicate hormonal imbalances or other health concerns.
Common Conditions Linked to Testosterone Levels
Low testosterone can be linked to conditions like hypogonadism, pituitary disorders, or chronic illnesses. High levels may suggest Cushing’s syndrome or tumors. Always discuss findings with your doctor.
Reference range
Optimal: <100 mg/dLN/A
Fasting for 12-14 hours preferred. Water is permitted. Avoid alcohol for 24 hours before the test.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Testosterone levels can influence energy, mood, and reproductive health. They may also affect bone density and muscle mass. Your provider will use these results alongside other factors to guide treatment decisions.
Short name
Serum Testosterone
Frequently asked questions
What causes abnormal testosterone levels?
How long does it take to get results?
Can I adjust my diet or exercise before the test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy