Male Thyroid & Cortisol Test Kit | Specialist Doctor Report Included

Test ID: SB-640 | Saliva 4-Point Cortisol + Blood Spot Thyroid Panel

The Male Thyroid & Cortisol Test Kit is a comprehensive at-home hormone test designed specifically for men, measuring 10 key markers across thyroid function and the full daily cortisol rhythm. It combines a 4-point saliva cortisol profile with a full blood spot thyroid panel — providing a clinically meaningful picture of two of the most consequential and interconnected hormone systems in men’s health.

Thyroid dysfunction in men is significantly underdiagnosed — partly because it presents differently than in women, and partly because standard TSH-only testing misses the most clinically relevant patterns. Simultaneously, chronic cortisol dysregulation directly suppresses thyroid hormone conversion, suppresses testosterone, and drives the fatigue, weight gain, and cognitive decline that men frequently attribute to ageing or overwork. Testing both together — as this kit does — is the most complete at-home assessment of metabolic and hormonal health available to men.

Test from home with confidence — no clinic visit required. Results within 3–5 working days.

Why This Test Is Particularly Important for Men

In men, the thyroid and adrenal (cortisol) systems are deeply intertwined with testosterone and metabolic function. When either system is dysregulated, the downstream effects on energy, body composition, sexual health, and cognitive performance are significant:

• Cortisol suppresses T3 conversion — under chronic stress, the body diverts T4 towards inactive reverse T3 (rT3) rather than active T3; this produces hypothyroid-like symptoms — fatigue, weight gain, brain fog, low motivation — with a completely normal TSH, detectable only when FT3 is measured
• Hypothyroidism suppresses testosterone — thyroid insufficiency directly impairs Leydig cell function and reduces testosterone production; men with undiagnosed low thyroid frequently present with low libido, erectile dysfunction, and andropause symptoms that resolve only when thyroid function is restored
• High cortisol and low thyroid both drive visceral fat accumulation — creating a compound effect on insulin resistance, cardiovascular risk, and aromatase activity, which converts testosterone to oestrogen and accelerates hormonal decline in men
• Thyroid autoimmunity occurs in men too — Hashimoto’s thyroiditis is less common in men than women but is frequently missed because TPO and Tg antibodies are rarely tested; men with elevated antibodies can have normal TSH for years while experiencing progressive thyroid decline
• The cortisol–testosterone–thyroid triad — in men under chronic stress, cortisol suppresses both testosterone and T3 simultaneously through shared precursor competition and HPA axis dysregulation; this is one of the most common and most underrecognised causes of hormonal decline in working-age men

What This Test Measures

Blood Spot — Full Thyroid Panel

• TSH (Thyroid Stimulating Hormone): The standard thyroid screen — but in men, TSH alone misses early thyroid dysfunction, antibody-positive Hashimoto’s, and cortisol-driven T3 suppression. A normal TSH does not rule out clinically significant thyroid impairment.
• Free T3 (FT3): The active thyroid hormone that enters cells and drives metabolism, energy production, body temperature, testosterone synthesis support, and cognitive function. Low FT3 with normal TSH is the hallmark of cortisol-driven thyroid suppression — the most common missed pattern in chronically stressed men.
• Free T4 (FT4): The thyroid’s primary output hormone, converted to active T3 in peripheral tissues. Low FT4 with normal TSH indicates early thyroid insufficiency or impaired conversion — often preceding overt hypothyroidism by years.
• Total T4 (TT4): Measures total circulating T4 including bound fraction. Provides context for interpreting FT4 and assessing overall thyroid output.
• TPO Antibodies (Anti-TPO): The primary diagnostic marker for Hashimoto’s thyroiditis — autoimmune thyroid disease that progressively destroys thyroid tissue. In men, elevated TPO antibodies are frequently present years before TSH becomes abnormal.
• Thyroglobulin Antibodies (Anti-Tg): A second autoimmune marker that can be elevated independently of TPO antibodies. Some men with Hashimoto’s have elevated Tg antibodies with normal TPO — making both markers necessary for complete autoimmune thyroid screening.

Saliva — 4-Point Cortisol Profile

• Morning Cortisol: Evaluates the Cortisol Awakening Response — the morning surge that activates metabolism, drives testosterone availability for the day, and sets cognitive readiness. A blunted response signals adrenal burnout; an exaggerated response indicates high stress reactivity and morning testosterone suppression.
• Noon Cortisol: Elevated noon cortisol in men promotes insulin resistance, visceral fat accumulation, and aromatase-driven testosterone-to-oestrogen conversion — a compound driver of metabolic and hormonal decline.
• Evening Cortisol: Should be declining to allow testosterone and growth hormone to begin rising during early sleep cycles. Elevated evening cortisol in men is a direct suppressor of overnight hormonal recovery.
• Night Cortisol: Elevated night cortisol suppresses the deep sleep phases during which the majority of daily testosterone is produced and thyroid hormone cellular uptake occurs — a primary cause of low morning testosterone, poor recovery, and persistent fatigue in men.

Who Should Consider This Test?

This test is particularly relevant for men who experience:

• Persistent fatigue or exhaustion that does not improve with sleep or rest
• Unexplained weight gain or difficulty losing body fat despite training and diet
• Brain fog, poor concentration, or reduced cognitive sharpness
• Low mood, reduced motivation, or mild depression
• Feeling cold all the time, or intolerance to cold temperatures
• Dry skin, hair thinning or loss, or slow wound healing
• Low libido or reduced sexual interest
• Erectile dysfunction or reduced performance
• Poor recovery from exercise or overtraining
• Chronic stress, burnout, or sustained high workload
• Insomnia, night waking, or unrefreshing sleep
• Palpitations, anxiety, or feeling constantly wired
• Symptoms of low testosterone with inconclusive blood results
• Currently on TRT and wanting a complete hormonal and metabolic picture
• Family history of thyroid disease or autoimmune conditions
• Previously diagnosed thyroid condition being monitored

Key Features

• 10-marker thyroid and cortisol panel in a single at-home kit
• Blood spot collection for thyroid markers — finger-prick, no venepuncture
• Saliva collection for cortisol — non-invasive, measures bioavailable (active) cortisol at four time points
• Results within 3–5 working days after lab receipt
• Expert analysis by a Hormone Specialist PhD Doctor
• Clear graphical and numerical results with personalised commentary
• All-inclusive price — laboratory fees included, no hidden costs
• Valid for 12 months from purchase

How It Works

1. Order the kit online — delivered directly to your door.
2. Collect your blood spot sample via a simple finger-prick onto the collection card, and your saliva samples at four time points across the day, following the detailed instructions provided. Morning collection should be completed before 9am for optimal cortisol accuracy.
3. Post your samples to the lab using the return instructions included in your kit.
4. Receive your results within 3–5 working days, with specialist commentary and clear next-step guidance.

What Your Report Includes

• All 10 marker results with male-specific reference ranges
• Visual charts for your cortisol daily curve and full thyroid panel values
• Clinical interpretation of the relationship between your thyroid and cortisol results — including how cortisol may be affecting your T3 conversion and testosterone
• Specialist commentary by a Hormone Specialist PhD Doctor
• Personalised next-step recommendations

Frequently Asked Questions

What does this test measure?

TSH, Free T3, Free T4, Total T4, TPO Antibodies, Thyroglobulin Antibodies (blood spot) plus Morning, Noon, Evening, and Night Cortisol (saliva) — 10 markers in total.

Why test thyroid and cortisol together?

Chronic cortisol elevation directly suppresses T4-to-T3 conversion in men, producing hypothyroid symptoms with a normal TSH. Simultaneously, low thyroid function impairs testosterone production and metabolic rate. Testing both together identifies whether symptoms stem from true thyroid disease, cortisol-driven suppression, autoimmune thyroid disease, or a combination — each requiring a different approach.

Can I use this test if I am on TRT or levothyroxine?

Yes. This test is particularly valuable for men on TRT who want to understand whether cortisol dysregulation or thyroid suppression is limiting the effectiveness of testosterone therapy. Follow the timing guidance in your kit.

How accurate is the test?

Blood spot samples are analysed using advanced immunoassay technology; saliva cortisol is measured using LC-MS/MS — the gold standard for bioavailable hormone measurement.

When will I get my results?

Within 3–5 working days after your samples reach the laboratory.

Are there hidden costs?

No. Laboratory analysis and specialist review are fully included. You are responsible for postage to the lab.

How long is the kit valid?

12 months from purchase.

Why We Partner with ZRT Laboratory

At Hormone Lab UK, every home test kit is analysed by ZRT Laboratory, a globally recognised, CLIA-certified diagnostic and research laboratory specialising in hormone testing, thyroid testing, fertility testing, adrenal function, neurotransmitter analysis, cardiometabolic health, heavy metals, and wellness testing. Founded in 1998 by renowned biochemist and breast cancer researcher Dr. David Zava, PhD, ZRT has become one of the world’s leading laboratories for advanced functional health testing.

With more than 11 million laboratory tests performed and healthcare professionals in over 96 countries relying on its expertise, ZRT is recognised for scientific excellence, analytical accuracy, and continuous innovation. The laboratory pioneered at-home saliva hormone testing, introduced the first commercially available dried blood spot (DBS) hormone tests, and developed Dried Urine Testing (DUTS), helping make advanced laboratory diagnostics more accessible and clinically meaningful.

Every sample is analysed using state-of-the-art LC-MS/MS and ICP-MS technology under rigorous quality control standards. ZRT collaborates with the CDC, NIH, and leading universities, supporting ongoing research and advances in laboratory medicine.