UW Schilling test

[Mr. Freeze]

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*If you haven't seen a/the UW schilling q, read on at your own risk...*





What exactly is the "normal" urine radioactivity level? Because I don't think there is a range for it. Unless it's on the bathroom floor of a McD's across the street from a cancer center, piss normally doesn't set off a Geiger counter (believe it or disprove it...). I was under the impression that if you give something radioactive, it's to mark a compartment of some sort that didn't previously have isotopes? So on USMLE can I assume that "normal" means glow in the dark piss after having given labeled oral B12?

Has anyone had one on the real deal?

I give up enough q's for **** I don't know to be missing stuff due to semantics...

 

[opb]

I remember that question on UWorld. I think what they meant by "normal urine radioactivity" is that the test showed what was expected of a normal radioactive B12 oral test (the patient was able to absorb the labeled B12 and thus it appeared in their urine... thus a normal test).

I remember kinda being confused about what that meant when I first read it, but then I just figured that they meant that the test results were normal (in other words, the patient has normal functioning absorption of B12).

I did not get a direct Schilling test question on my exam, however thorough knowledge of how B12 is normally absorbed was needed to answer a few of my questions.

 

[It'sElectric]

I also vaguely recall the question on UWorld, and I'm in agreement with opb. I think a normal test is simply that radioactive urine showed up (there's probably some sort of cut-off, but who gives a ****) - indicating the pt was able to properly absorb B12. The im injection of B12 saturates the pt so that some of the excess radiolabeled, orally ingested B12 is simply peed out.

 

[Tiger26]

Heme is by far one of my strongest subjects and I remember getting really confused by that question even though I felt I knew quite a bit about the Shilling test

 

[Mr. Freeze]

Heme is by far one of my strongest subjects and I remember getting really confused by that question even though I felt I knew quite a bit about the Shilling test

Probably in the same boat.

If I had no clue how to do one, it wouldn't bother me

Just hate reading q's expecting to be tricked, and then when I'm not, missing them.