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Testosterone, Total (Serum)

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

This test measures the total 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

["Your total testosterone level helps assess hormone balance, especially in men with suspected low testosterone or women with hormonal concerns."]

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

Key facts at a glance

LOINC
47940-2
Short code
Testost 12h p 5000 U HCG IM SerPl-mCnc
Synonyms
Testost 12h p 5000 U HCG IM SerPl-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
0
Ref high
5
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84702
SNOMED
275917004
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 energy, reduced sex drive, or changes in body hair. It could also be part of evaluations for infertility, delayed puberty, or conditions affecting hormone levels.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the draw if your lab uses a specific method. Wear comfortable clothing for blood draws.

What the Results Mean

Results are compared to general reference ranges for your age and sex, but individual needs vary. High or low levels may signal underlying health issues requiring further evaluation.

Common Reasons for Testing

This test is often used to diagnose conditions like hypogonadism (low testosterone), evaluate fertility, or monitor hormone therapy. It may also help assess conditions like polycystic ovary syndrome (PCOS) in women.

Reference range

Non-pregnant: <5 mIU/mLN/A

Specimen: serum

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Total Testosterone

Frequently asked questions

How often will I need this test?
The frequency depends on your health status and symptoms. Your provider will determine how often to repeat it, such as every 6–12 months for monitoring or as needed for treatment adjustments.
What if my results are outside the normal range?
If your results are abnormal, your healthcare provider will discuss next steps, which may include additional tests, lifestyle changes, or treatment options tailored to your situation.
Can I take supplements or medications before the test?
Some medications (like certain steroids or anti-androgens) or supplements (like soy or ginseng) may affect results. Always inform your provider about all medications or supplements you’re taking before testing.
  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