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Testosterone, Total (Serum or Plasma)

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

This test measures the total amount of testosterone, a key male hormone, in your blood. Testosterone plays a role in muscle and bone development, sex drive, and overall health.

Quick summary

["Your total testosterone levels help assess hormone balance, especially in men and women with suspected hormonal issues."]

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

Key facts at a glance

LOINC
47944-4
Short code
Testost 4h p 5000 U HCG IM SerPl-mCnc
Synonyms
Testost 4h p 5000 U HCG IM SerPl-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
4.5
Ref high
12
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84436
SNOMED
302345006
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 Is Done

Doctors may order a total testosterone test to diagnose or monitor conditions like low testosterone (hypogonadism), fertility issues, or symptoms of hormonal imbalances such as irregular periods, low libido, or fatigue.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the blood draw if your test includes other hormone measurements. Wear comfortable clothing and plan to stay near the lab for a short time.

What the Test Involves

A healthcare provider will collect a blood sample from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. The sample is then sent to a lab for analysis.

What the Results Mean

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

Reference range

Adult: 4.5-12.0 μg/dLN/A

Specimen: serum

Take your thyroid medication after the blood draw if applicable. No fasting required.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Total Testosterone

Frequently asked questions

What causes abnormal testosterone levels?
Abnormal results may be due to conditions like pituitary disorders, kidney or liver disease, obesity, or certain medications. Hormonal imbalances, genetic factors, or stress can also affect testosterone levels.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab’s processing time. Follow up with your healthcare provider to discuss findings and next steps.
Can lifestyle changes affect testosterone levels?
Yes, factors like diet, exercise, sleep, and weight can influence testosterone. Maintaining a healthy weight, managing stress, and getting adequate sleep may support balanced hormone levels.
  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