Pregnenolone
Measures pregnenolone levels to assess hormone production, adrenal function, and neurosteroid balance in the body.
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LevelPanel has no business or affiliate relationship with Quest or LabCorp. These links are provided as a public service.
Lab testing services linked from this site are not available to residents of Alaska, Arizona, or Hawaii, unless otherwise noted on the lab's own website.
This publication is not intended to solicit the purchase of laboratory testing from any individual consumer.
What this test measures
Pregnenolone is a steroid hormone that sits at the top of the body's hormone production chain. Synthesized from cholesterol in the adrenal glands, gonads (ovaries and testes), and brain, pregnenolone serves as the starting material from which the body manufactures cortisol, progesterone, estrogen, testosterone, and DHEA. Because so many downstream hormones depend on it, measuring pregnenolone provides a window into the body's overall capacity for steroid hormone production and adrenal function.
Beyond its role as a precursor, pregnenolone acts as a neurosteroid, meaning it is active in the brain, where it influences cognitive function, memory, mood regulation, and the stress response. Research has also identified anti-inflammatory and neuroprotective properties. This test measures the concentration of pregnenolone in the blood, typically using mass spectrometry for precision, and is ordered when healthcare providers are evaluating adrenal function, unexplained hormonal imbalances, or cognitive and mood symptoms that may have a hormonal component.
Who should consider this test
You might consider this test if you are experiencing any of the following:
- Individuals experiencing unexplained fatigue, decreased energy levels, or persistent weakness that may indicate adrenal insufficiency or hormone imbalances.
- Those with cognitive concerns such as memory problems, difficulty concentrating, or mental fog that could be related to declining neurosteroid levels.
- People with symptoms suggestive of hormone deficiencies, including low libido, mood changes, sleep disturbances, or irregular menstrual cycles.
- Individuals with suspected congenital adrenal hyperplasia (CAH) or other adrenal disorders, particularly when other hormone tests have been inconclusive.
- Those considering hormone replacement therapy or supplement regimens who want to assess their baseline steroid hormone production capacity before treatment begins.
What to expect
Preparation
No special fasting is required for pregnenolone testing. Patients should inform their healthcare provider about any steroid medications, hormone supplements, or birth control pills, as these may affect test results. The timing of sample collection may be specified for optimal interpretation.
Sample Type
A healthcare professional will collect a blood sample through a standard venipuncture procedure, typically from a vein in the arm. The sample requires special handling and must be separated from blood cells promptly to ensure accurate results.
Collection
The blood draw is quick and straightforward, taking only a few minutes. The specimen must be processed and frozen immediately to maintain hormone stability. Some laboratories may require specific collection tubes without gel separators for optimal testing accuracy.
Turnaround
Results are typically available within 2 to 5 business days after the laboratory receives the sample. The processing time may vary depending on the specific testing methodology and laboratory workload.
Understanding your results
Normal serum pregnenolone levels generally fall in the range of 22 to 237 ng/dL, though exact reference ranges vary by laboratory and testing methodology. Because pregnenolone feeds into multiple hormonal pathways, results are most informative when interpreted alongside other steroid hormones (such as cortisol, DHEA-S, and sex hormones) to identify where in the production chain a potential imbalance may exist. Healthcare providers evaluate findings in the context of symptoms, age, and overall hormonal profile.
| Population | Reference Range | Notes |
|---|---|---|
| Adults | 22-237 ng/dL | Reference ranges may vary by laboratory and methodology. Some sources suggest optimal levels of 125-175 ng/dL for optimal health. |
Reference ranges may vary by laboratory and individual factors. Results should be interpreted by a healthcare provider in the context of your overall health.
What does a “Low” result mean?
Low pregnenolone levels may occur naturally with aging, as natural declines occur with age. Chronic stress may also deplete pregnenolone levels. Low levels in individuals can be associated with various health issues, including adrenal insufficiency, hypopituitarism, and chronic stress, which can lead to fatigue, mood disorders, and cognitive difficulties. Additional factors that may contribute to decreased levels include certain medications, severe illness, or impaired adrenal gland function.
What does a “High” result mean?
High pregnenolone levels may be caused by congenital adrenal hyperplasia (CAH), an inherited condition where enzyme deficiencies prevent pregnenolone from being converted into steroid hormones. This can cause deficiency of cortisol and an overabundance of male hormones. Elevated levels might also indicate adrenal tumors or hyperplasia. Additional causes may include certain medications, stress conditions, or other endocrine disorders affecting steroid hormone metabolism.
Privacy & confidentiality
Your pregnenolone test results are completely confidential and protected under HIPAA regulations. Results are not shared with your personal physician unless you specifically request it, not added to your permanent medical records, and will not appear on insurance explanation of benefits statements.
Frequently asked questions
Related tests
Cortisol
Downstream hormone from pregnenolone; helps assess adrenal function
View TestDHEA-Sulfate
Another key hormone derived from pregnenolone in the steroidogenesis pathway
View TestTestosterone
End product of pregnenolone conversion; useful for comprehensive hormone evaluation
View TestProgesterone
Direct downstream product of pregnenolone via the delta-4 pathway
View TestRelated conditions
Last reviewed: April 2026
CPT Code: 84140
This test may not be available in: NY, NJ, RI
This page is for informational purposes only and does not constitute medical advice. Always consult with a healthcare provider regarding any health concerns. LevelPanel does not diagnose, treat, or prescribe.
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LevelPanel has no business or affiliate relationship with Quest or LabCorp. These links are provided as a public service.
Lab testing services linked from this site are not available to residents of Alaska, Arizona, or Hawaii, unless otherwise noted on the lab's own website.
This publication is not intended to solicit the purchase of laboratory testing from any individual consumer.
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