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Chemistry Laboratory 6
Glucose Oxidase
27
Chemistry
Graduate
11/29/2012

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Term
glucose oxidase procedure
Definition
you have to have at least 5 test tubes (blk, L1, L2, Std, and Patient) filled with glucose liquicolor reagent. Then add correct ingredients to the labeled test tube and mix and incubate. Record the absorbances at 500nm then calculate the concentrations of the controls and the patients using beers law.
Term
The sources of error
Definition
interfering substances like hemoglobin, uric acid, ascorbic acid, and bilirubin
Term
The reference range of concentration of glucose oxidase
Definition
adult are 74-100 mg/dL
Term
The control levels
Definition
have predetermined values with reference ranges. They are used to verify accurate test performance.
Term
The principle of the glucose oxidase procedure
Definition
glucose oxidase enzyme will convert glucose in to a product, which can be used in another reaction to produce a colored complex. The colored complex can be measure spectrophotometrically and the absorbance is proportional to the amount of glucose in the sample.
Term
The concentration of glucose is calculated by using beer’s law
Definition
Cu = Au/As x Cs, Cs is given, answer is in mg/dL
Term
Are the results accurate?
Definition
if controls are within range, then yes
Term
Are the results precise?
Definition
need to compare run 1 to run 2, are the results similiar
Term
What do you do if the controls are out of range?
Definition
trouleshoot the procedure, figure out what went wrong.
Term
What do you do if one of your unknowns is greater than 400 mg/dL
Definition
dilute to 1:2 and re-run, remember to multiply results by 2
Term
Glucose levels in spinal fluid are used to diagnose
Definition
meningitis
Term
Example of a monosaccharide
Definition
glucose
Term
Example of a disaccharide
Definition
maltose
Term
Example of a polysaccharide
Definition
glycogen
Term
Insulin is produced by
Definition
beta cells of the pancreas
Term
During a brief fast, the glycogen stores of the _____ are drawn upon to release glucose
Definition
liver
Term
Other than glucose oxidase, name 2 other methods for glucose determination
Definition
glucose-1-dehydrogenase and hexokinase
Term
Three pathogenic conditions causing a rise in glucose concentration in the serum
Definition
diabetes, hyperthyroidism and cushing's disease
Term
Three pathogenic conditions causing a decrease in glucose concentration in the serum
Definition
tumors, addison's and hypothyroidism
Term
Adult reference range for plasma or serum
Definition
74-100 mg/dL
Term
Adult reference range for whole blood
Definition
65-95 mg/dL
Term
Adult reference range for CSF
Definition
40-70 mg/dL
Term
Adult reference range for urine
Definition
1-15 mg/dL
Term
Blood drawn for glucose determination should be centrifuged within 1 hour due to__________, which ______the glucose level
Definition
glycolysis, decreaes
Term
CSF should be analyzed for glucose without delay due to _______, which _________ the glucose level
Definition
bacterial contamination, glycolysis and decrease
Term
Why does glycosolated hemoglobin reflect long term control of the diabetic
Definition
measurement of the percentage of hemoglobin bound to glucose which is indicative of the amount of glucose over the lifespan of the RBC
Term
A urine specimen for glucose determination should be collected in a ________ medium in order to suppress ____________
Definition
acidic, bacterial activity (glycolysis)
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