Hormones . Symptoms guide
Low Libido in Men: What Blood Tests Show
Low libido in men is usually a multi-factor picture: testosterone, thyroid, vitamin D, sleep, stress and relationship factors all contribute. Bloodwork rules out the medical drivers in a single appointment, leaving the lifestyle and psychological factors to address separately.
This patient information is being clinically reviewed by our team. The factual content draws on UK guidance (NHS, NICE, British Association of Dermatologists, British Society for Sexual Medicine where cited).
What this might be
- Low testosterone. Most common medical cause; treatable if confirmed on repeat testing.
- Thyroid dysfunction. Both under and overactive thyroid can blunt libido.
- Vitamin D deficiency. Linked to lower testosterone and lower libido scores.
- Sleep deprivation. Reduces testosterone production overnight; a panel can confirm if this is biochemical.
- SSRIs and other medications. Bloodwork rules out other contributors so the medication review can be informed.
Common features that suggest this
- Reduced interest in sex for 3 or more months
- Reduced morning erections
- Persistent fatigue or low mood
- Recent significant stress or sleep disruption
Recommended tests
Same-day appointments at our Harley Street clinic, results clinician-reviewed.
Need a marker not in these panels? Build a custom panel and a GMC-registered clinician will design one for you.
Testing advice
Morning slot. No fasting. Avoid heavy alcohol the night before.
Common questions
Will the test be discreet?
Yes. All consultations and results are confidential. The report uses clinical language only.
Can low libido be cured by raising testosterone?
When testosterone is the cause, raising it usually helps. When it is not, treating testosterone will not improve libido. That is why the panel is the right first step rather than starting treatment blind.