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***Medical Lab science review- Robert Harr 4th > Urinalysis and Body Fluids- Routine physical & biochemical urine test > Flashcards

Urinalysis and Body Fluids- Routine physical & biochemical urine test Flashcards

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1
Q
  1. Which statement regarding renal function is true?
    A. Glomeruli are far more permeable to H2O and
    salt than other capillaries
    B. The collecting tubule reabsorbs sodium and
    secretes potassium in response to antidiuretic
    hormone (ADH)
    C. The collecting tubule is permeable to H2O only
    in the presence of aldosterone
    D. The thick ascending limb is highly permeable to
    H2O and urea
A

A. Glomeruli are far more permeable to H2O and
salt than other capillaries

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2
Q
  1. Which statement regarding normal salt and H2O
    handling by the nephron is correct?
    A. The ascending limb of the tubule is highly
    permeable to salt but not H2O
    B. The stimulus for ADH release is low arterial
    pressure in the afferent arteriole
    C. The descending limb of the tubule is impermeable
    to urea but highly permeable to salt
    D. Renin is released in response to high plasma
    osmolality
A

A. The ascending limb of the tubule is highly
permeable to salt but not H2O

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3
Q
  1. Which statement concerning renal tubular
    function is true?
    A. In salt deprivation, the kidneys will conserve
    sodium at the expense of potassium
    B. Potassium is not excreted when serum
    concentration is below 3.5 mmol/L
    C. No substance can be excreted into urine at a rate
    that exceeds the glomerular filtration rate
    D. When tubular function is lost, the specific
    gravity of urine will be below 1.005
A

A. In salt deprivation, the kidneys will conserve
sodium at the expense of potassium

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4
Q
  1. Which of the following is inappropriate when
    collecting urine for routine bacteriologic culture?
    A. The container must be sterile
    B. The midstream void technique must be used
    C. The collected sample must be plated within
    2 hours unless refrigerated
    D. The sample may be held at 2°C–8°C for up
    to 48 hours prior to plating
A

D. The sample may be held at 2°C–8°C for up
to 48 hours prior to plating

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5
Q
  1. Which statement about sample collection for
    routine urinalysis is true?
    A. Preservative tablets should be used for collecting
    random urine specimens
    B. Containers may be washed and reused if rinsed
    in deionized H2O
    C. Samples may be stored at room temperature for
    up to 2 hours
    D. First morning voided samples are not acceptable
    when renal disease is suspected
A

C. Samples may be stored at room temperature for
up to 2 hours

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6
Q
  1. Which urine color is correlated correctly with the
    pigment-producing substance?
    A. Smoky red urine with homogentisic acid
    B. Dark amber urine with myoglobin
    C. Deep yellow urine and yellow foam with
    bilirubin
    D. Red-brown urine with biliverdin
A

C. Deep yellow urine and yellow foam with
bilirubin

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7
Q
  1. Which of the following substances will cause urine
    to produce red fluorescence when examined with
    an ultraviolet lamp (360 nm)?
    A. Myoglobin
    B. Porphobilinogen (PBG)
    C. Urobilin
    D. Coproporphyrin
A

D. Coproporphyrin

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8
Q
  1. Which of the following conditions is associated
    with normal urine color but produces red
    fluorescence when urine is examined with an
    ultraviolet (Wood’s) lamp?
    A. Acute intermittent porphyria
    B. Lead poisoning
    C. Erythropoietic porphyria
    D. Porphyria cutanea tarda
A

B. Lead poisoning

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9
Q
  1. Which statement regarding porphyria is accurate?
    A. Porphyria is exclusively inherited
    B. All types cause an increase in urinary porphyrins
    C. All types are associated with anemia
    D. Serum, urine, and fecal tests may be needed for
    diagnosis
A

D. Serum, urine, and fecal tests may be needed for
diagnosis

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10
Q
  1. Which is the most common form of porphyria?
    A. Erythropoietic porphyria
    B. Acute intermittent porphyria
    C. Variegate porphyria
    D. Porphyria cutanea tarda
A

D. Porphyria cutanea tarda

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11
Q
  1. Which of the following methods is the least
    sensitive and specific for measuring PBG (porphobilinogen) in urine?
    A. Watson–Schwartz test
    B. LC–MS
    C. Ion exchange chromatography–Ehrlich’s reaction
    D. Isotope dilution–MS
A

A. Watson–Schwartz test

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12
Q
  1. A brown or black pigment in urine can be
    caused by:
    A. Gantrisin (Pyridium)
    B. Phenolsulfonphthalein
    C. Rifampin
    D. Melanin
A

D. Melanin

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13
Q
  1. Urine that is dark red or port wine in color may be
    caused by:
    A. Lead poisoning
    B. Porphyria cutanea tarda
    C. Alkaptonuria
    D. Hemolytic anemia
A

B. Porphyria cutanea tarda

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14
Q
  1. Which of the following tests is affected least by
    standing or improperly stored urine?
    A. Glucose
    B. Protein
    C. pH
    D. Bilirubin
A

B. Protein

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15
Q
  1. Which type of urine sample is needed for a
    D-xylose absorption test on an adult patient?
    A. 24-hour urine sample collected with 20 mL
    of 6 N HCl
    B. 2-hour timed postprandial urine preserved with
    boric acid
    C. 5-hour timed urine kept under refrigeration
    D. Random urine preserved with formalin
A

C. 5-hour timed urine kept under refrigeration

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16
Q
  1. Which of the following is inappropriate
    when collecting a 24-hour urine sample for
    catecholamines?
    A. Urine in the bladder is voided and discarded at
    the start of the test
    B. At 24 hours, any urine in the bladder is voided
    and added to the collection
    C. All urine should be collected in a single container
    that is kept refrigerated
    D. Ten mL of 1N sodium hydroxide should be
    added to the container before collection
A

D. Ten mL of 1N sodium hydroxide should be
added to the container before collection

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17
Q
  1. Urine production of less than 400 mL/day is:
    A. Consistent with normal renal function and
    H2O balance
    B. Termed isosthenuria
    C. Defined as oliguria
    D. Associated with diabetes mellitus
A

C. Defined as oliguria

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18
Q
  1. Which of the following contributes to SG, but
    not to osmolality?
    A. Protein
    B. Salt
    C. Urea
    D. Glucose
A

A. Protein

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19
Q
  1. Urine with an SG consistently between 1.002
    and 1.003 indicates:
    A. Acute glomerulonephritis
    B. Renal tubular failure
    C. Diabetes insipidus
    D. Addison’s disease
A

C. Diabetes insipidus

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20
Q
  1. In which of the following conditions is the urine
    SG likely to be below 1.025?
    A. Diabetes mellitus
    B. Drug overdose
    C. Chronic renal failure
    D. Prerenal failure
A

C. Chronic renal failure

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21
Q
  1. Which statement regarding methods for
    measuring SG is true?
    A. To correct a urinometer, subtract 0.001 per each
    3°C below 15.5°C
    B. Colorimetric SG tests are falsely elevated when a
    large quantity of glucose is present
    C. Colorimetric SG readings are falsely elevated
    when pH is alkaline
    D. Refractometry should be performed before the
    urine is centrifuged
A

A. To correct a urinometer, subtract 0.001 per each
3°C below 15.5°C

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22
Q
  1. What is the principle of the colorimetric reagent
    strip determination of SG in urine?
    A. Ionic strength alters the pKa of a polyelectrolyte
    B. Sodium and other cations are chelated by a
    ligand that changes color
    C. Anions displace a pH indicator from a mordant,
    making it water soluble
    D. Ionized solutes catalyze oxidation of an azo dye
A

A. Ionic strength alters the pKa of a polyelectrolyte

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23
Q
  1. Which statement regarding urine pH is true?
    A. High-protein diets promote an alkaline urine pH
    B. pH tends to decrease as urine is stored
    C. Contamination should be suspected if urine pH
    is less than 4.5
    D. Bacteriuria is most often associated with a low
    urine pH
A

C. Contamination should be suspected if urine pH
is less than 4.5

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24
Q
  1. In renal tubular acidosis, the pH of urine is:
    A. Consistently acid
    B. Consistently alkaline
    C. Neutral
    D. Variable, depending upon diet
A

B. Consistently alkaline

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25
Q
  1. The normal daily urine output for an adult is
    approximately:
    A. 0.2–0.5 L
    B. 0.6–1.6 L
    C. 2.7–3.0 L
    D. 3.2–3.5 L
A

B. 0.6–1.6 L

26
Q
  1. The SG of the filtrate in Bowman’s space is
    approximately:
    A. 1.000–1.002
    B. 1.004–1.006
    C. 1.008–1.010
    D. 1.012–1.014
A

C. 1.008–1.010

27
Q
  1. A patient with partially compensated respiratory
    alkalosis would have a urine pH of:
    A. 4.5–5.5
    B. 5.5–6.5
    C. 6.5–7.5
    D. 7.5–8.5
A

D. 7.5–8.5

28
Q
  1. Which of the following is most likely to cause a
    false-positive dry reagent strip test for urinary
    protein?
    A. Urine of high SG
    B. Highly buffered alkaline urine
    C. Bence–Jones protein
    D. Salicylates
A

B. Highly buffered alkaline urine

29
Q
  1. When testing for urinary protein with
    sulfosalicylic acid (SSA), which condition
    may produce a false-positive result?
    A. Highly buffered alkaline urine
    B. The presence of x-ray contrast media
    C. Increased urinary SG
    D. The presence of red blood cells (RBCs)
A

B. The presence of x-ray contrast media

30
Q
  1. A discrepancy between the urine SG determined
    by measuring refractive index and urine osmolality
    would be most likely to occur:
    A. After catheterization of the urinary tract
    B. In diabetes mellitus
    C. After an intravenous pyelogram (IVP)
    D. In uremia
A

C. After an intravenous pyelogram (IVP)

31
Q
  1. Which of the following is likely to result in a
    false-negative dry reagent strip test for
    proteinuria?
    A. Penicillin
    B. Aspirin
    C. Amorphous phosphates
    D. Bence–Jones protein
A

D. Bence–Jones protein

32
Q
  1. Daily loss of protein in urine normally does not
    exceed:
    A. 30 mg
    B. 50 mg
    C. 100 mg
    D. 150 mg
A

D. 150 mg

33
Q
  1. Which of the following is least likely to cause a
    false-positive result with turbidimetric protein
    tests?
    A. Tolbutamide
    B. X-ray contrast media
    C. Penicillin or sulfa antibiotics
    D. Ascorbic acid
A

D. Ascorbic acid

34
Q
  1. Which statement best describes the clinical utility
    of tests for microalbuminuria?
    A. Testing may detect early renal involvement in
    diabetes mellitus
    B. Microalbuminuria refers to a specific subfraction
    of albumin found only in persons with diabetic
    nephropathy
    C. A positive test result indicates the presence of
    orthostatic albuminuria
    D. Testing should be part of the routine urinalysis
A

A. Testing may detect early renal involvement in
diabetes mellitus

35
Q
  1. Dry reagent strip tests for microalbuminuria that
    compare albumin to creatinine determine the
    creatinine concentration based upon which
    principle?
    A. Formation of a Cu+2-creatinine complex
    B. Enzymatic assay using sarcosine oxidase and
    peroxidase
    C. Reaction of creatinine with alkaline sodium
    picrate
    D. Change in pH as creatinine is converted to
    creatine
A

A. Formation of a Cu+2-creatinine complex

36
Q
  1. Which of the following conditions is least likely
    to be detected by dry reagent strip tests for
    proteinuria?
    A. Orthostatic albuminuria
    B. Chronic renal failure
    C. Pyelonephritis
    D. Renal tubular proteinuria
A

D. Renal tubular proteinuria

37
Q
  1. The normal renal threshold for glucose is:
    A. 70–85 mg/dL
    B. 100–115 mg/dL
    C. 130–145 mg/dL
    D. 165–180 mg/dL
A

D. 165–180 mg/dL

38
Q
  1. In which of the following conditions is glycosuria
    most likely?
    A. Addison’s disease
    B. Hypothyroidism
    C. Pregnancy
    D. Hypopituitarism
A

C. Pregnancy

39
Q
  1. In addition to ascorbate, the glucose oxidase
    reaction may be inhibited by which substance?
    A. Acetoacetic acid (AAA)
    B. ε-Aminocaproic acid
    C. Creatinine
    D. Azopyridium
A

A. Acetoacetic acid (AAA)

40
Q
  1. A positive glucose oxidase test and a negative test
    for reducing sugars indicates:
    A. True glycosuria
    B. False-positive reagent strip test
    C. False-negative reducing test caused by ascorbate
    D. Galactosuria
A

A. True glycosuria

41
Q
  1. A negative glucose oxidase test and a positive test
    for reducing sugars in urine indicates:
    A. True glycosuria
    B. A false-negative glucose oxidase reaction
    C. The presence of a nonglucose reducing sugar
    such as galactose
    D. A trace quantity of glucose
A

C. The presence of a nonglucose reducing sugar
such as galactose

42
Q
  1. In what condition may urinary ketone tests
    underestimate ketosis?
    A. Acidosis
    B. Hemolytic anemia
    C. Renal failure
    D. Excessive use of vitamin C
A

A. Acidosis

43
Q
  1. AAA is detected in urine by reaction with:
    A. Sodium nitroprusside
    B. o-Toluidine
    C. m-Dinitrobenzene
    D. m-Dinitrophenylhydrazine
A

A. Sodium nitroprusside

44
Q
  1. Nondiabetic ketonuria can occur in all of the
    following except:
    A. Pregnancy
    B. Renal failure
    C. Starvation
    D. Lactate acidosis
A

B. Renal failure

45
Q
  1. Which of the following statements regarding the
    classical nitroprusside reaction for ketones is true?
    A. The reaction is most sensitive to acetone
    B. Nitroprusside reacts with acetone, AAA, and
    β-hydroxybutyric acid
    C. It may be falsely positive in phenylketonuria
    D. The reaction is recommended for diagnosing
    ketoacidosis
A

C. It may be falsely positive in phenylketonuria

46
Q
  1. Hemoglobin in urine can be differentiated from
    myoglobin using:
    A. 80% ammonium sulfate to precipitate
    hemoglobin
    B. Sodium dithionite to reduce hemoglobin
    C. o-Dianisidine instead of benzidine as the color
    indicator
    D. The dry reagent strip blood test
A

A. 80% ammonium sulfate to precipitate
hemoglobin

47
Q
  1. Which of the following conditions is associated
    with a negative blood test and an increase in urine
    urobilinogen?
    A. Calculi of the kidney or bladder
    B. Malignancy of the kidney or urinary system
    C. Crush injury
    D. Extravascular hemolytic anemia
A

D. Extravascular hemolytic anemia

48
Q
  1. Which statement about the dry reagent strip blood
    test is true?
    A. The test is based on the reaction of hemoglobin
    with peroxidase
    B. Abnormal color may be absent from the urine
    when the reaction is positive
    C. A nonhemolyzed trace is present when there
    are 1–2 RBCs per high-power field
    D. Salicylates cause a false-positive reaction
A

B. Abnormal color may be absent from the urine
when the reaction is positive

49
Q
  1. A moderate-positive blood test and trace protein
    test are seen on the dry reagent strip, and
    11–20 red blood cells per high-power field are
    seen in the microscopic exam. These results are
    most likely caused by which of the following?
    A. Transfusion reaction
    B. Myoglobinuria
    C. Intravascular hemolytic anemia
    D. Recent urinary tract catheterization
A

D. Recent urinary tract catheterization

50
Q
  1. Which of the following results are discrepant?
    A. Small amount of blood but negative protein
    B. Moderate amount of blood but no RBCs in
    microscopic exam
    C. Negative blood but 6–10 RBCs/high-power
    field (HPF)
    D. Negative blood, positive protein
A

C. Negative blood but 6–10 RBCs/high-power
field (HPF)

51
Q
  1. Which of the following statements regarding the
    dry reagent strip test for bilirubin is true?
    A. A positive test is seen in prehepatic, hepatic,
    and posthepatic jaundice
    B. The test detects only conjugated bilirubin
    C. Standing urine may become falsely positive due
    to bacterial contamination
    D. High levels of ascorbate will cause positive
    interference
A

B. The test detects only conjugated bilirubin

52
Q
  1. Which of the following reagents is used to detect
    urobilinogen in urine?
    A. p-Dinitrobenzene
    B. p-Aminosalicylate
    C. p-Dimethylaminobenzaldehyde
    D. p-Dichloroaniline
A

C. p-Dimethylaminobenzaldehyde

53
Q
  1. Which of the following statements regarding
    urinary urobilinogen is true?
    A. Diurnal variation occurs with highest levels seen
    in the early morning
    B. High levels occurring with a positive bilirubin
    test indicate obstructive jaundice
    C. Dry reagent strip tests do not detect decreased
    levels
    D. False-positive results may occur if urine is stored
    for more than 2 hours
A

C. Dry reagent strip tests do not detect decreased
levels

54
Q
  1. Which of the following statements regarding the
    test for nitrite in urine is true?
    A. It detects more than 95% of clinically significant
    bacteriuria
    B. Formation of nitrite is unaffected by the
    urine pH
    C. The test is dependent upon an adequate dietary
    nitrate content
    D. A positive test differentiates bacteriuria from in
    vitro bacterial contamination
A

C. The test is dependent upon an adequate dietary
nitrate content

55
Q
  1. Which statement about the dry reagent strip test
    for leukocytes is true?
    A. The test detects only intact white blood
    cells (WBCs)
    B. The reaction is based upon the hydrolysis of
    substrate by WBC esterases
    C. Several antibiotics may give a false-positive
    reaction
    D. The test is sensitive to 2–3 WBCs per HPF
A

B. The reaction is based upon the hydrolysis of
substrate by WBC esterases

56
Q
  1. Which of the following statements about
    creatinine clearance is correct?
    A. Dietary restrictions are required during the
    24 hours preceding the test
    B. Fluid intake must be restricted to below 600 mL
    in the 6 hours preceding the test
    C. Creatinine clearance is mainly determined by
    renal tubular function
    D. Creatinine clearance is dependent upon lean
    body mass
A

D. Creatinine clearance is dependent upon lean
body mass

57
Q
  1. A male patient’s eGFR is 75 mL/min. This
    indicates:
    A. Normal glomerular filtration rate
    B. The patient is uremic and will be hyperkalemic
    C. Renal tubular dysfunction
    D. Reduced glomerular filtration without uremia
A

D. Reduced glomerular filtration without uremia

58
Q
  1. Which of the following tests is a specific measure
    of glomerular filtration?
    A. p-Aminohippuric acid (PAH) clearance
    B. Fishberg concentration test
    C. Mosenthal dilution test
    D. Cystatin C
A

D. Cystatin C

59
Q
  1. Which statement regarding urea is true?
    A. Urea is 100% filtered by the glomeruli
    B. Blood urea levels are independent of diet
    C. Urea is not significantly reabsorbed by the
    tubules
    D. Urea excretion is a specific measure of glomerular
    function
A

A. Urea is 100% filtered by the glomeruli

60
Q
  1. Given the following data, calculate the creatinine
    clearance.
    Serum creatinine = 1.2 mg/dL;
    urine creatinine = 100 mg/dL;
    urine volume = 1.4 L/day;
    body surface area = 1.80 m2
    A. 47 mL/min
    B. 78 mL/min
    C. 100 mL/min
    D. 116 mL/min
A

B. 78 mL/min

***Medical Lab science review- Robert Harr 4th (63 decks)

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