No statistically significant correlation exists between bisphenol A (BPA) concentrations measured in urine and hair samples from the same individuals.

Source: Sensitive Determination of Bisphenol A In Urine Using Automated Solid-Phase Extraction Followed by LC-MS/MS Analysis: Application to a Human Biomonitoring Study in Brazil

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports

23score

Challenges

0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Correlation

1 study reviewed

In plain English

Measurements of BPA in urine and hair from the same people do not show a consistent relationship, suggesting that these two body samples may capture different patterns of exposure.

See the scientific wording

No correlation was found between BPA concentrations in urine and hair in the same individuals, indicating that these two matrices may reflect different exposure pathways or kinetics.

Why this might work

BPA enters the body through food or skin contact, gets processed by the liver, and most of it is quickly filtered out by the kidneys and flushed in urine within hours. But a tiny amount sticks around in the body longer and gets trapped in growing hair, where it stays locked in as the hair grows, so hair shows what you were exposed to over weeks or months, not just today.

Supported mechanismbased on 1 study

What the research says

1 study

Study: Sensitive Determination of Bisphenol A In Urine Using Automated Solid-Phase Extraction Followed by LC-MS/MS Analysis: Application to a Human Biomonitoring Study in Brazil
In the same people, BPA in urine didn't match BPA in hair, which means your body processes and stores BPA differently in these two places—urine shows recent exposure, while hair shows longer-term patterns.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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