Answering your questions on odd urine specific gravities, sendout handling fees, osmotic fragility method, and blood culture contamination rate. (Tips from the clinical experts).(Brief Article)

Medical Laboratory Observer | December 1, 2001| | Copyright

Odd urine specific gravities

Q: In our lab, when we have a specific gravity <1.005, we check it out on a refractometer and then accept the refractometer results. Recently we have encountered a few specimens with negative glucose and negative protein that give refractometer results> 1.035 -- not just a little, but a lot. Two recent results were 1.092 and 1.104. Our policy is to dilute the urine with distilled water and repeat the test on the refractometer. Is there a drug or perhaps something used in x-ray testing that might cause such results? The patients did have radiologic procedures using contrast dyes. We use a Bayer Clinitek 200 for our dipstick testing.

A: When specific gravity readings greater than 1.035 by refractometer, accompanied by normal ...

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