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Testosterone, Serum

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

This test measures the amount of testosterone, a key male hormone, in your blood. Testosterone helps regulate muscle and bone growth, sex drive, and red blood cell production.

Quick summary

["Testosterone levels can help diagnose hormonal imbalances or conditions like low testosterone (hypogonadism) or high testosterone (hyperandrogenism)."]

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

Key facts at a glance

LOINC
93730-0
Short code
Testost Amn-sCnc
Synonyms
Testost Amn-sCnc
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test to check for hormonal issues, evaluate symptoms like low energy, changes in libido, or irregular menstrual cycles, or monitor conditions like infertility, delayed puberty, or certain cancers.

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 it involves drawing blood from your arm. Wear comfortable clothing and plan to stay near a testing facility for a short time.

What Happens During the Test?

A healthcare professional will insert a small needle into your arm to draw blood. You may feel a slight pinch, but it’s usually over quickly. The blood sample is sent to a lab for analysis.

What Are Possible Results?

Results are compared to a general reference range, but individual ranges can vary based on age, sex, and health status. High or low levels may signal underlying health concerns that need further evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Testosterone Level

Frequently asked questions

What causes abnormal testosterone levels?
Abnormal testosterone levels can result from conditions like pituitary gland disorders, kidney or liver disease, obesity, or certain medications. Genetics, aging, and chronic illnesses can also play a role.
How often should I get this test?
Your doctor will determine how often you need this test based on your symptoms, medical history, and other health factors. Some people may need it once a year, while others may need it more frequently.
Can lifestyle changes affect testosterone levels?
Yes! Regular exercise, a balanced diet, maintaining a healthy weight, and avoiding smoking or excessive alcohol can help support healthy testosterone levels. Stress management also plays a role in overall hormonal balance.
  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