So I'm trying to figure out what my dad was exposed to and honestly the question that keeps me up at night is whether a little bit of exposure could have caused this or if he was really heavily exposed. Like, is there a threshold where you're safe and then you cross it and that's when meso develops.
I know from nursing school that asbestos causes disease through cumulative exposure and fiber burden in the lungs, but the clinical literature is kind of vague on whether there's an actual safe level. From what I can find, there's no established "safe" dose. Even brief exposure can potentially cause meso years or decades later, though obviously longer exposure and higher concentrations increase risk significantly.
My dad worked construction in Chicago back in the 70s and 80s, mostly doing HVAC installation and renovation work. He probably wasn't a dedicated asbestos worker but he was around it regularly, handling insulation and old pipe wrapping without protection. His oncologist said the latency period for pleural meso is typically 20 to 50 years, which tracks with his timeline perfectly.
The frustrating part is we'll probably never know exactly how much he inhaled or how many fibers settled in his pleura. What I've learned is that even occupational exposure at lower levels can cause disease if the fibers are the right type (amphibole fibers are worse than chrysotile) and if they persist in the lung tissue long enough.
Anybody else dealing with this same question about their loved one's exposure history? Like trying to piece together what happened decades ago?