What is a possible cause of iatrogenic proteinuria?

Iatrogenic proteinuria refers to the presence of excess protein in the urine as a direct result of medical intervention or procedure. One prominent cause of this condition is trauma that occurs during diagnostic or therapeutic procedures, such as bladder expression, cystocentesis, or catheterization. During these procedures, physical manipulation of the urinary tract can cause damage to the renal tubules or the glomeruli, leading to leakage of protein into the urine.

The other options mentioned do not directly relate to iatrogenic causes. A high protein diet can result in proteinuria, but it is a dietary consequence rather than a result of medical treatment. Diabetes mellitus can lead to proteinuria due to underlying kidney damage, but again, it is not iatrogenic. Acidosis is a metabolic condition that does not specifically lead to the excessive presence of protein in urine due to medical procedures. Thus, trauma from expressions, cystocentesis, or catheterization is the correct context for understanding iatrogenic proteinuria.