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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. Testosterone plays a role in muscle and bone development, red blood cell production, and sexual function.

Quick summary

["Understanding your testosterone levels can help assess hormone balance and overall health."]

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

Key facts at a glance

LOINC
83115-6
Short code
Testost SerPl IA-sCnc
Synonyms
Testost SerPl IA-sCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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?

Your healthcare provider may order this test to evaluate symptoms related to low or high testosterone, such as low libido, fatigue, or changes in body hair. It can also help diagnose conditions like hypogonadism (low testosterone) or Cushing’s syndrome (high testosterone).

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if your lab requires a fasting sample. Wear a loose-fitting shirt for easy vein access.

What Happens During the Test?

A healthcare professional will draw blood from a vein in your arm using a small needle. You may feel a slight pinch, but it typically doesn’t cause significant discomfort. The process takes a few minutes.

What Do the Results Mean?

Results are compared to general reference ranges, but individual needs vary. Your provider will discuss findings in the context of your symptoms, medical history, and other test results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormally low testosterone can lead to fatigue, reduced muscle mass, mood changes, or infertility. High testosterone may indicate conditions like polycystic ovary syndrome (in women) or tumors. Regular monitoring helps manage these risks and guide treatment if needed.

Short name

Serum Testosterone Level

Frequently asked questions

How often should I get this test?
The frequency depends on your symptoms, medical history, and age. Your provider will determine the best schedule for you, such as every few months or annually.
What if my results are outside the normal range?
If your results are abnormal, your provider may recommend further testing, lifestyle changes, or treatment options tailored to your needs. They’ll explain what this means for your health and next steps.
Can diet or exercise affect testosterone levels?
Yes, certain foods, vitamins, and physical activity can influence testosterone. Avoiding excessive alcohol, maintaining a balanced diet, and staying active may support healthy hormone levels, but results vary by individual.
  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