Mass spectrometry
LabCorp or Quest
Bioavailable T
Know Your Real Number
The testosterone your body can use.
Total testosterone counts what’s locked up by SHBG. Bioavailable testosterone shows what’s free to work.
Research
What the research says about testosterone
557 men
Healthy men aged 23 to 92
Strength & function
Free testosterone tracked lean mass, grip strength and physical function more closely than total testosterone
Aging Clinical and Experimental Research, 2025
249 men
Middle-aged men, testosterone measured four ways
Metabolic health
Total testosterone was the strongest testosterone marker of metabolic syndrome
Endocrine Journal, 2015
26%
Lower Alzheimer’s risk for each 10-unit rise in free testosterone index
Brain health
Over 19 years of follow-up, men with higher free testosterone developed Alzheimer’s less often
Neurology, 2004 · 574 men
These are observational studies of men’s natural testosterone levels. They show links, not cause and effect. Your care team can talk you through what your own result means.
Testosterone Test
Lab test- Blood draw
- LC-MS/MS
- Total + bioavailable
Free and weakly bound (bioavailable) testosterone with total testosterone, the testosterone your body can actually use, drawn at a LabCorp or Quest lab near you.
Bioavailable (free and weakly bound) testosterone with total testosterone.- Total testosterone by mass spectrometry, the gold standard for accuracy.
- Drawn at a LabCorp or Quest patient service center near you.
Collection: Blood draw at a LabCorp patient service center
- Lab order placed by a licensed HuHealth provider
- Thousands of patient service centers nationwide
- Results reviewed with your care team
Testosterone
Half the hormone. Hardly any answers.
Average testosterone has fallen sharply in a generation, yet most men with symptoms never find out why. Constant tiredness and a flat drive are easy to blame on stress or age.
Declining Testosterone
Testosterone may be declining due to lifestyle factors.
Modern habits like poor sleep, low activity and excess weight are linked to lower testosterone, which can affect energy, mood and motivation.
Diagnosis
Studies suggest that 1 in 4 men have low testosterone levels
Citations: Araujo AB, Esche GR, Kupelian V, O’Donnell AB, Travison TG, Williams RE, Clark RV, McKinlay JB. Prevalence of symptomatic androgen deficiency in men. J Clin Endocrinol Metab. 2007;92(11):4241–4247. doi:10.1210/jc.2007-1245. PMID: 17698901
Travison TG, Araujo AB, O’Donnell AB, Kupelian V, McKinlay JB. A population-level decline in serum testosterone levels in American men. J Clin Endocrinol Metab. 2007;92(1):196–202. doi:10.1210/jc.2006-1375.
Your path to your testosterone levels
Your 4-step journey with HuHealth
- Step 1
Order your test
- Pick LabCorp or Quest
- Your price is shown upfront
- Step 2
We place your lab order
- A licensed HuHealth provider orders the test
- Find a patient service center near you
- Step 3
Get your blood drawn
- A quick draw, best in the morning
- No kit to mail back
- Step 4
Review your results
- Bioavailable and total testosterone in one report
- Talk them through with your HuHealth care team
Built around you
Thoughtful healthcare that feels personal, not clinical
Your Lab, Your Choice
Choose LabCorp or Quest and get your blood drawn at a location that works for you.
LabCorp or QuestYour blood draw
LC-MS/MSSee the Full Picture
Your report shows bioavailable testosterone next to total testosterone, so a normal total can’t hide a low usable level.
Your report • Total T
543 ng/dL
Sample result
What you see
TotalBioavailableFree + weakly bound
Turn Results into a Plan
Your care team walks you through your numbers and, if it makes sense, the options to raise them.
Results Reviewwith your care team
Research
What the research says about testosterone
- Strength & function
557 men
Healthy men aged 23 to 92
Free testosterone tracked lean mass, grip strength and physical function more closely than total testosterone
Read the study (opens in a new tab)Aging Clinical and Experimental Research, 2025
- Metabolic health
249 men
Middle-aged men, testosterone measured four ways
Total testosterone was the strongest testosterone marker of metabolic syndrome
Read the study (opens in a new tab)Endocrine Journal, 2015
- Brain health
26%
Lower Alzheimer’s risk for each 10-unit rise in free testosterone index
Over 19 years of follow-up, men with higher free testosterone developed Alzheimer’s less often
Read the study (opens in a new tab)Neurology, 2004 · 574 men
These are observational studies of men’s natural testosterone levels. They show links, not cause and effect. Your care team can talk you through what your own result means.
Our ethos
“Innovation isn’t about being radical, it’s about doing the simple thing properly.”
FAQs
Frequently asked Questions.
The bioavailable testosterone test was developed and its performance characteristics determined by the performing laboratory. It has not been cleared or approved by the U.S. Food and Drug Administration. Testing is performed by LabCorp or Quest Diagnostics, laboratories regulated under the Clinical Laboratory Improvement Amendments of 1988 (CLIA).
This test is not intended to diagnose, treat, cure or prevent any disease on its own. Talk to a licensed healthcare provider about your results. Product image is for illustration only.
