Which of the following tests included on a urine chemical reagent strip would never be reported out as negative? - answers-Urobilinogen is reported as normal, not negative. A normal urobilinogen result is approximately 0.2-1.0 Ehr U/dL
A voided urine specimen is delivered from the women's clinic...
Which of the following tests included on a urine chemical reagent strip would never
be reported out as negative? - answers-Urobilinogen is reported as normal, not
negative. A normal urobilinogen result is approximately 0.2-1.0 Ehr U/dL
A voided urine specimen is delivered from the women's clinic to the laboratory six
hours after collection. The following results are reported:
Clarity: cloudy
Nitrite: positive
Sp. Gravity: 1.020
pH: 9.0 - answers-These results indicate that the urine may have remained too long
at room temperature and bacterial contaminants have affected the nitrite and pH
results. Unpreserved urine samples should be refrigerated if they cannot be
analyzed within two hours.
Which of the following procedures should be followed when performing a manual
urine reagent strip test? (choose all that apply) - answers-Compare strip to color
chart to check for correlating color and handling strips at the end away from the test
area are the two correct answers. It is incorrect to leave the reagent strip bottle cap
off until testing is completed as moisture from the air can alter the test pads on the
chemical reagent strips.
Sulfosalicylic acid is a secondary method that can be used to determine the
presence of which one of the following substances in the urine, if color interference
CONT +
, UA BF CHEM exam with correct
answers 2024
prevents the accurate reading of a urine chemical reagent strip? - answers-The SSA
reaction is used to detect protein in the urine. It is sometimes used as a secondary
method if interfering urine color makes it difficult to read the color reaction on the
urine reagent strip
Which of the following urine chemical reagent strip tests is based on the Ehrlich-
aldehyde reaction? - answers-The urobilinogen urine chemical reagent strip test is
based on the Ehrlich-aldehyde reaction. In this test, a pink-red color forms in
proportion to the amount of urobilinogen present.
What effect may bacterial contamination have on urine pH? - answers-A urine pH
above 8.0 may indicate that a specimen has been held unpreserved too long, which
allows multiplication of urea-splitting bacteria with resultant increase in pH
Which of the following statements is TRUE regarding the reagent strip test
procedure? - answers-Urine should be well mixed prior to dipping the reagent strip.
Urine should NOT be centrifuged prior to dipping the reagent strip. Not all reagent
strip tests can be read immediately after dipping the reagent strip into the urine
specimen; the manufacturer's read-times must be followed.
Excessive carbohydrate loss that may occur due to vomiting or rapid weight loss
may result in the presence of which of following substances not normally contained
in the urine? - answers-Normal urine specimens usually yield negative results for the
CONT +
, UA BF CHEM exam with correct
answers 2024
presence of ketones. Low levels of ketones may be detected in the urine during
conditions of physiological stress such as fasting, rapid weight loss, frequent
strenuous exercise or prolonged vomiting. The presence of ketones in these
situations is due to either inadequate intake of carbohydrates or increased loss of
carbohydrates.
Urine should be at room temperature prior to testing with the reagent strip method. -
answers-This statement is true. Urine should be at room temperature prior to testing
with the reagent strip method. Urine strip reactivity can increase with increased urine
temperature, so the optimum temperature is 22-26o C, or room temperature.
A patient who has a primarily vegetarian diet will most likely have an acid urine pH -
answers-False
The reagent strip method for protein primarily tests for which type of protein? -
answers-The urine reagent strip method for protein primarily indicates increased
albumin, although other proteins may also produce a positive result if greatly
elevated.
When the glucose result on a urine specimen from an infant is negative on the urine
reagent strip, it can be assumed that the specimen is also negative for other
reducing substances such as galactose. - answers-This statement is false. The
method used with the urine chemical reagent strip is specific for glucose.
CONT +
, UA BF CHEM exam with correct
answers 2024
A patient suspected of a urinary tract infection has a negative nitrite test, but bacteria
are present upon microscopic examination. What may have caused this discrepant
result? (Choose ALL correct answers) - answers-When a urine sample shows a
negative nitrite test, but bacteria are present upon microscopic examination, the
false-negative result could be caused by two possibilities listed in the choices above:
The bacteria that is present is not a nitrate-reducer OR the urine was in the bladder
for an insufficient amount of time for nitrate to be reduced to nitrite.
Which of the following white blood cells would NOT produce a positive leukocytes
test on the urine reagent strip? - answers-The presence of lymphocytes will not
produce a positive leukocytes test since lymphocytes do not contain leukocyte
esterase. Detection of leukocyte esterase is the basis of the leukocytes reagent strip
test. Granulocytes (neutrophils, eosinophils, and basophils) contain leukocyte
esterase and would be detected by the reagent strip test.
Match the following urine chemical reagent strip test pads to the disease or disorder
that would most likely cause a positive test result. - answers-Ketones- Diabetes
mellitus
Blood- Renal calculi
Bilirubin- Hepatitis/cirrhosis
Nitrite- Urinary tract infection
CONT +
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