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Testosterone (Serum) with 3-Phase Stimulation (Triple Bolus) Profile

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

This test measures your testosterone levels before, during, and after a controlled dose of testosterone to assess how your body responds.

Quick summary

["Evaluates natural testosterone production and hormonal balance under stimulation."]

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

Key facts at a glance

LOINC
40325-3
Short code
Testost pre Triple Bolus SerPl-sCnc
Synonyms
Testost pre Triple Bolus SerPl-sCnc
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 This Test Is Done

Your doctor may order this test if they suspect conditions like hypogonadism (low testosterone), delayed puberty, or other hormonal imbalances. It helps determine if your body can produce testosterone normally or if external factors are affecting it.

What to Expect Before the Test

You’ll receive a controlled dose of testosterone (a bolus) on two separate occasions. Blood samples will be taken at baseline, during, and after each dose to measure your response. Avoid alcohol and certain medications that may affect hormone levels for 24 hours before testing.

What Happens During the Test

A healthcare provider will draw blood samples from a vein in your arm at scheduled times. The samples are sent to a lab for analysis using immunoassay methods to measure testosterone concentration.

What the Results Mean

Results compare your natural testosterone levels to those after stimulation. Abnormal responses may indicate issues with hormone production, pituitary function, or other endocrine disorders. Your doctor will interpret results in the context of your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Triple Bolus Testosterone Test

Frequently asked questions

What could this test detect or rule out?
This test helps diagnose conditions like hypogonadism (low testosterone), delayed puberty, or pituitary dysfunction. It may also assess whether testosterone replacement therapy is appropriate or effective.
How does this differ from a standard testosterone test?
Unlike a single baseline testosterone test, this triple-bolus test evaluates your body’s ability to respond to hormonal stimulation, providing a more comprehensive picture of your hormonal health.
Will I need to prepare differently for this test than a regular blood draw?
Yes, you’ll need to follow specific instructions regarding timing of doses and fasting, as well as avoiding certain medications or substances that could interfere with results.
  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