Body Composition Test in San Francisco
How much of your weight is fat, muscle and bone, and 11 clinics in San Francisco that list it.
- Time
- Minutes to half an hour Depends on the method
- What you do
- Stand on a device or lie on a table Bioimpedance or a DEXA scan
- You get
- Your fat and lean mass DEXA adds bone density
A body composition test splits your weight into fat and lean tissue rather than giving you one number on a scale. Clinics use two main methods. DEXA is a low-dose X-ray scan you lie still for, and it also reports bone density. Bioimpedance sends a small, painless electrical current through your body and estimates the split from how easily it travels.
People use it to see what is changing as they train or change their diet, since the scale alone cannot tell muscle gained from fat lost. The two methods are different tests, so a number from one is not directly comparable with a number from the other. Bioimpedance is offered under brands like InBody.
Physical activity in San Francisco, by the numbers
The rate of physical inactivity in San Francisco is lower than the national rate. About 1 in 5 adults in San Francisco did no physical activity outside work in the past month, compared with about 1 in 4 nationally. That adds up to roughly 770,000 adults across five counties.
CDC estimates. PLACES figures are modelled from a national health survey, not counted from medical records, so read them as estimates.
See how the five counties compare
| County | No exercise outside work | Obesity | Serious difficulty walking |
|---|---|---|---|
| Alameda | 20.6% | 22.8% | 11.3% |
| Contra Costa | 23.7% | 28.0% | 12.2% |
| San Francisco | 19.2% | 17.2% | 10.2% |
| San Mateo | 20.2% | 22.3% | 11.0% |
| Marin | 18.2% | 21.3% | 12.6% |
| San Francisco | 20.9% | 22.9% | 11.3% |
| United States | 25.1% | 33.2% | 13.8% |
Source: CDC PLACES, 2023 county estimates. San Francisco = San Francisco, Alameda, Contra Costa, San Mateo and Marin counties, weighted by adult population.
longevityclinicshub.comYour regular doctor is the place to start, especially before a big change in how active you are. The tests above show where you're starting from, so progress is easier to see later.
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Body Composition Test: common questions
Which clinics in San Francisco list body composition testing?
11 in our San Francisco guide: Biohackr Health, San Francisco, Medical Institute of Healthy Aging, Walnut Creek, My Doctor Medical Group, Human Longevity, South San Francisco, Cenegenics San Francisco, Longevity Health, San Francisco, DEXA SF, JYZEN, Kalos Health San Francisco, BodySpec SF Marina and BodySpec SF Rincon Hill.
Does it matter when I take the test?
Yes, for bioimpedance in particular. How much water you are carrying moves the result, so compare tests taken at the same time of day and in the same state, for example in the morning before eating.
How often should I retest?
Often enough to see a real change, which usually means months rather than weeks. Use the same method and, where you can, the same machine each time.
Sources: ACR and RSNA, RadiologyInfo: Bone Density Scan (DEXA); Kyle UG et al., Bioelectrical impedance analysis, part I: review of principles and methods. Clinical Nutrition, 2004; Influence of passive, diet-based hydration on muscle quantity assessment, Frontiers in Physiology