Final answer:
Catheterization is considered an invasive procedure as it involves the insertion of a catheter into the body. Other options like X-rays and urinalysis are non-invasive.
Step-by-step explanation:
Within the options given:
- Intake-output measurement
- Catheterization
- X-ray of the abdomen
- Urinalysis
the procedure considered to be invasive is
catheterization
. This is because it involves the insertion of a catheter into the body, specifically into a hollow organ, such as the bladder, to withdraw or introduce fluids. The other options listed, such as intake-output measurement, X-rays, and urinalysis, are non-invasive procedures as they do not require entering the body through incisions or natural openings.