A different BPA test found very little in sweat
Sweat patches rarely detected BPA above background, even when urine tests did. This was ordinary sweat collection, not a sauna intervention.
Worth knowing: This summary was checked against the original PubMed abstract. The full text was not retrieved for this pass.
The short version
Fifty volunteers wore sweat patches for seven days while collecting morning urine. BPA appeared clearly above background on just three participant patches. In an additional experiment, urine detected deliberate BPA exposure, but sweat patches did not. This differs from the BUS findings, although it used a different collection method and did not induce heavy sweating. The result raises questions about sweat testing rather than directly testing whether sauna removes BPA.
Keep in mind
A patch worn during daily life is not equivalent to collecting sweat during sauna.
What they found
Three patches exceeded five times average background. In the additional exposure experiment, urine BPA reached 195 ng/mL without a corresponding above-background patch result.
What this means for your practice
A negative sweat test does not establish absence of exposure; a positive one does not measure total body stores.
Methods and limitations
What the researchers did
The researchers compared week-long sweat patches with daily urine and checked that the laboratory method could recover BPA added to patches.
How much can this tell us?
Low sweat volume or collection limitations could help explain the result. It is not a direct replication of a sauna experiment.
What makes it useful
- Concurrent urine measurements
- Laboratory controls
What limits it
- No sauna intervention
- Collection method may miss exposure
- Abstract-level source check
Where this study fits
Where this study fits
We score claims, not single studies. This one is part of the evidence for:
Sweat can carry some plastic-related chemicals and flame retardants. Early signal
Very low certaintySize not reportedBody signals
Read the original
Porucznik CA et al. A Preliminary Study of Biomonitoring for Bisphenol-A in Human Sweat. Journal of Analytical Toxicology. 2015.
DOI 10.1093/jat/bkv055 · PubMed 26013102