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Pre-admission lab work on a patient scheduled for surgery shows a fasting blood sugar of 200...

Pre-admission lab work on a patient scheduled for surgery shows a fasting blood sugar of 200 mg/dl. Results of the routine UA are:

Color: pale yellow     Appearance: Clear    Sp. Gravity:   1.030    pH: 5.0    Protein: 1+    Glucose: 100 mg/dL   Ketones: trace     Bilirubin: neg     Blood: neg     Urobilinogen:  normal     Nitrite: neg     Leukocyte: neg

Which answer below explains the correlation between the patient's blood and urine glucose results.

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Answer #1

The usefulness of urinary glucose measurement in the management of diabetes depends on its accuracy in reflecting the blood glucose concentrations. The two measurements are not actually related as the urine glucose concentration will be affected by urine volume, renal threshold for glucose and peak blood glucose levels reached between bladder voidings. The values may vary from day to day because of variation in patient's activity fluid intake, general health and in qualitative changes in carbohydrate eaten.

Overnight, changes in blood glucose concentration occurs more slowly but beacause of longer time for bladder voidings they are not so accurately reflected by urinary glucose concentrations

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