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A drop in libido, energy, or muscle after 30 is easy to write off as ageing. Sometimes it is. Sometimes it is testosterone deficiency (hypogonadism), including the version where total testosterone looks “normal” because sex hormone-binding globulin (SHBG) has bound up the active hormone.
The PrivateDoc Male Health Blood Test measures total testosterone, calculated free testosterone, SHBG, and prolactin from a morning finger-prick sample, with a GMC-registered doctor reviewing the report.
Total testosterone measures the entire concentration of testosterone in your bloodstream, whereas free testosterone represents the small, unbound fraction (typically 1% to 2%) that is biologically active and available to enter cells. The remaining testosterone is bound tightly to proteins, primarily sex hormone-binding globulin (SHBG) and albumin.
The primary symptoms of low testosterone include chronic fatigue, unexplained loss of lean muscle mass, increased abdominal body fat, low mood or irritability, brain fog, and a noticeable drop in libido or erectile quality. While testosterone naturally drops by roughly 1% per year after age 30, severe symptoms suggest clinical deficiency rather than normal ageing.
| Biomarker | Normal clinical role | Symptoms when imbalanced |
|---|---|---|
| Total testosterone | Overall circulating testicular androgen | Low: fatigue, reduced drive, muscle loss |
| SHBG | Regulates hormone bioavailability | High: binds up active testosterone, creating functional deficiency |
| Calculated free testosterone | Active, tissue-usable hormone | Low: poor physical recovery, low libido, brain fog |
| Prolactin | Pituitary hormone | High: suppresses natural testosterone synthesis and can cause ED |
A testosterone blood test must be collected first thing in the morning, ideally between 8:00am and 10:00am, while fasting. Testosterone levels follow a strict diurnal rhythm, peaking early in the morning and declining by up to 30% to 40% by late afternoon.
The PrivateDoc Male Health Blood Test allows you to collect a small morning finger-prick sample at home to measure total testosterone, calculated free testosterone, SHBG, and prolactin. All samples are processed by UK-accredited laboratories and assessed by GMC-registered doctors.
A blood test does not start testosterone replacement. If treatment is discussed later, it is only authorised after a successful clinical assessment.
If libido, energy, or muscle change is why you want a test, start the questionnaire. We match the male health panel when it is the right kit.
Disclaimer: This article is for general information only and does not replace personalised medical advice. Always speak to a qualified clinician before starting or changing treatment. An at-home blood test does not replace your GP or emergency care.
Total testosterone is all circulating hormone. Free testosterone is the small unbound fraction that can enter cells. High SHBG can make total look normal while free testosterone is low.
Chronic fatigue, loss of lean muscle, more abdominal fat, low mood, brain fog, and reduced libido or erectile quality. A mild yearly decline can be ageing; severe symptoms suggest deficiency.
Between 8:00am and 10:00am, fasting. Afternoon samples can read 30% to 40% lower and are not a fair peak measurement.
Order the Male Health Blood Test, collect a morning finger-prick sample, and post it in the prepaid pack. A GMC-registered doctor reviews total testosterone, free testosterone, SHBG, and prolactin in your account.
We post the matched kit. You return it in the prepaid pack
A clinician reviews the laboratory report in your PrivateDoc account
Lp(a) is a genetic cholesterol particle NHS lipid checks usually omit. See why HEART UK recommends a once-lifetime test and how PrivateDoc's cardiac profile includes it.
Persistent fatigue that sleep does not fix can come from low ferritin, vitamin D or B12, or an underactive thyroid. A clinician-reviewed home blood test can find the cause.
A Weight and Metabolism blood profile can identify thyroid, blood sugar, iron, and lipid issues that stall weight loss. A UK clinician reviews the report and can guide next steps.
NICE often diagnoses menopause from symptoms if you are over 45. A home hormone panel can still help in perimenopause, younger symptoms, or when HRT is not settling things. A clinician reviews the report.
A home blood test is only useful once a UK-registered clinician has reviewed the report. PrivateDoc matches a kit from a short questionnaire and explains abnormal markers in your account.
