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Testosterone, Serum (Mass Concentration)

Published: August 9, 2026Updated: August 16, 2026

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 characteristics.

Quick summary

["Understanding your testosterone levels can help identify hormonal imbalances."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
2984-3
Short code
Testost Sal-mCnc
Synonyms
Testost Sal-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Is This Test Done?

Doctors may order a testosterone test to evaluate symptoms of low or high hormone levels, such as changes in libido, fatigue, or reproductive issues. It’s also used in diagnosing conditions like hypogonadism (low testosterone) or Cushing’s syndrome (high testosterone).

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the test if your blood is drawn early in the morning. Wear comfortable clothing and plan to stay for about 15 minutes while the blood is drawn.

What Happens During the Test?

A healthcare provider will collect a blood sample from a vein in your arm using a small needle. You may feel a slight pinch, but the procedure is quick and usually painless. The sample is then sent to a lab for analysis.

What Are the Results?

Results are typically reported as a mass concentration of testosterone in your blood. Your doctor will compare these results to your individual reference range and medical history to determine if further action is needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Serum Testosterone Level

Frequently asked questions

How long does it take to get my results?
Testosterone results are usually available within 1–3 business days, depending on your lab’s processing time. Your doctor will contact you once they are ready to discuss the results with you.
Can I eat or drink before the test?
If your blood is drawn in the morning, you may need to fast for 8–12 hours before the test. If your provider specifies otherwise, follow their instructions. Avoid caffeine or alcohol before the test, as they may affect results.
What if my results are outside the normal range?
If your testosterone levels are outside the expected range, your doctor may recommend additional tests, lifestyle changes, or treatments to address potential hormonal imbalances. They’ll work with you to determine the best next steps based on your symptoms and medical history.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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