I've come across this issue previously, where I couldn't find anyone who could help with mercury biological monitoring (no one could do the air monitoring either). I ended up finding a General Practitioner with a special interest in occupational health (GPSI). I explained what they were potentially being exposed to, and they sorted out the blood work and interpretation.
In your case mild steel and low alloy steels, the recommended biological monitoring is for chromium, nickel and manganese (sourced from Breathe Freely NZ NZOHS)).

Kia ora Courtney

I have been asked a number of times by students why should we bother spending so much time on emergency management when we should focus on preventing injuries and incidents. I.e. all injuries are preventable. I can see where they are coming from, but this concept requires a perfect world with perfect people and a perfect understanding of everything. Unfortunately, this just isn't our world.

I explain to students that there are two types of errors, determinate (systemic) and indeterminate (random). Determinate errors are errors that can be avoided or mitigated through training, process management and awareness. Indeterminate errors occur randomly or accidentally and there is no control over the error. These errors followed the mathematical law of probability. Hence, you cannot achieve zero-harm.

Thus, we need to focus on both sides, prevention and emergency management.

In addition, there are so many psychosocial and physical viables at play that we cannot foresee everything that could happen. Hindsight is great for showing us what we missed.

I agree with Keith, facts over belief.