In urine Glucose reagent strip test is specific why?!
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Assuming that your question is why does the reagent in such strips react only with glucose, I can answer it. If not, I'm not sure what you're asking. Anyway, here goes.
The test strips contain enzymes which are specific to glucose, and have been tested against many other things commonly found in urine. In the presence of glucose (and only glucose) they trigger a reaction which causes a color change. You compare the color change to the standard (after just so many seconds) and that tells you your current glucose level.
But actually it doesn't. It only tells you that there is so much glucose in the urine, even if you do the test correctly. And that's not very useful to most diabetics. They need to know what the blood glucose level is, not the average of what's been passed by the kidneys in the last few hours. And, the kidneys generally don't start passing glucose until the blood glucose level it's too high; the renal threshold for glucose is typically about twice the normal glucose level for blood, and that's way too high. Any glucose in the urine (if your kidneys are working at all reasonably) is too much and a sign that blood glucose levels have been way too high.
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Blood glucose meters
The blood glucose meters work very much the same way. Since blood is, characteristically, somewhat different chemically than urine, adjustments in the composition of the reagent mixture are needed, and the meter itself does the color change measurement (or the electrical current measurement in meters which work that way) instead of you, but the principle's the same.
Getting a sample to test is rather different, of course. Poking a little hole in your finger is more annoying in its way than catching some urine, but to each test its vices.
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i think i know wat ur talking about its prolly got a different name to what its called where im from but a glucose strip test the keytones in the urine
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