Do you routinely check serum phosphorus levels after IV iron therapy?

Only before and after FCM. I hold subsequent doses if phosphorus low. There is no need to monitor with the other formulations. For people needing multiple doses of IV iron (IBD, bariatric surgery, heavy uterine bleeding, angiodysplasia), I avoid FCM.

I do not routinely monitor serum phosphorus levels after intravenous iron therapy if ferric carboxymaltose (FCM) is not being administered. At our institution, the top two formulary choices for outpatient use for iron repletion are iron sucrose and ferumoxytol, neither of which is associated with a high incidence of hypophosphatemia. In our hospitalized patients, our first formulary option is Ferric gluconate, which is also not associated with a significant risk of hypophosphatemia.

The risk of h...