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63 terms

Urinalysis Final Q5 W10

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Which of the following is inappropriate when collecting urine for routine bacteria culture?
Sample may be held at 2-8˚C for up to 48 hours prior to plating
Which urine color is correlated correctly with the pigment-producing substance?
Deep yellow urine and yellow foam with bilirubin
A brown or black pigment in urine can be caused by:
Melanin
Urine that is dark red or port wine in color may be caused by:
Porphyria cutanea tarda
Which of the following tests is affected least by standing or improperly stored urine?
Protein
Urine production of less than 400 mL/day is:
Oliguria
Urine with a SG consistently between 1.002 and 1.003 indicates:
Diabetes insipidus
Which of the following is most likely to cause a false-positive dry reagent strip test for protein?
Highly buffered alkaline urine
Which statement best describes the clinical utility of tests for microalbuminuria?
Testing may detect early renal involvement in diabetes mellitus
In which of the following conditions is glycosuria most likely?
Pregnancy
A positive glucose oxidase test and a negative test for reducing sugars indicate:
True glycosuria
A negative glucose oxidase test and a positive test for reducing sugars in urine indicate:
Presence of a nonglucose reducing sugar such as galactose
Ketones are detected in urine by reaction with:
Sodium nitroprusside
Which ketone body is sodium nitroprusside specifically reacting with in the ketone test?
Acetoacetic acid
Which of the following conditions is associated with a negative blood test and an increase in urine urobilinogen?
Extravascular hemolytic anemia
Which of the following results are discrepant?
Negative blood but 6-10 RBCs/high power field
Which of the following reagents is used to detect urobilinogen in urine?
p-Dimethylaminobenzaldehyde
Which statement about the dry reagent strip test for leukocytes is true?
The reaction is based upon the hydrolysis of substrate by WBC esterases
Which of the following statements about creatinine clearance is correct?
Creatinine clearance is dependant on lean body mass
All of the following statements regarding urinary casts are true except:
Casts can be seen in significant numbers even when protein tests are negative
What is the mucoprotein that forms the matrix of a hyaline cast is called?
Tamm-Horsfall protein
What is the sediment with moderate hematuria and RBC casts most likely results from?
Acute glomerulonephritis
What does a urine sediment characterized by pyuria with bacterial and WBC casts indicate?
Pyelonephritis
Which type of casts signals the presence of chronic renal failure?
Waxy casts
When examining urinary sediment, which of the following is considered an abnormal finding?
0-1 renal cell casts/lpf
Which of the following crystals is considered nonpathological?
Ammonium biurate
At which pH are ammonium biurate crystals usually found in urine?
Alkaline urine only
What are oval fat bodies are derived from?
Renal tubular epithelium
What are oval fat bodies are often associated with?
Tubular necrosis
Which condition is associated with the greatest proteinuria?
Nephrotic syndrome
What is acute pyelonephritis is commonly caused by?
Bacterial infection
Which statement about renal calculi is true?
Calcium oxalate and calcium phosphate account for about three quarters of all stones
What crystals are the cause of gout?
Uric acid or monosodium urate
A glitter cell is a term used to describe a specific type of
Neutrophil
What is the final phase of degeneration that granular casts undergo?
Waxy
Alkaptonuria, a rare hereditary disease, is characterized by the urine excretion of
Homogentisic acid
Excessive lipid metabolism, as is seen in diabetes mellitus, is indicated by the presence in the urine of
Ketone bodies
A reagent test strip impregnated with a diazonium salt may be used to determine which analyte?
Bilirubin
The strip test for hemoglobin may yield false positive results for the presence of hemoglobin when the urine specimen contains
Myoglobin
With infections of the urinary system, which WBC is most often seen?
Neutrophil
What causes increased urinary excretion of protein during the day while at night there is a normal excretion of protein?
Orthostatic proteinuria
What microscopic element is seen in uncontrolled diabetic patients?
Yeast
Nitrite in a urine specimen suggests the presence of:
Bacteria
What shows abnormal skeleton structure, mental retardation and corneal damage?
Hurler syndrome
What is true about the final concentrating of urine in the kidney?
Vasopressin controls the collecting duct reabsorption of water
What grows in urine specimen is left standing at room temperature for several hoursing changes may occur?
Bacteria
What can Phenylketonuria cause if left untreated?
Brain damage.
What abnormality is sex linked, impacts the skeleton and mental retardation?
Hunter syndrome
Patients with diabetes insipidus tend to produce urine in ______ volume with _______ specific gravity.
Increased, decreased
What is the name of a subarachnoid hemorrhage that is not a traumatic tap?
Xanthochromia
If a fasting glucose level of 100 mg/dL is obtained, what is the expected fasting CSF glucose level?
65 mg/dL
What term used to denote a high WBC count in the CSF?
Pleocytosis
The diagnosis of multiple sclerosis is often based upon which finding?
The presence of oligoclonal bands by electrophoresis
Which organism is the most frequent cause of bacterial meningitis in neonates?
Group B streptococci
Which test best correlates with the severity of hemolytic disease of the newborn (HDN)?
Amniotic fluid bilirubin
Which is the reference method for determining fetal lung maturity?
L/S ratio
What is true regarding the L/S ratio ?
A ratio of 2:1 or greater usually indicates adequate pulmonary surfactant to prevent respiratory distress syndrome
What is is the lower limit of normal for sperm concentration?
20 million/mL
What stain is used to determine sperm viability?
Eosin Y
What has the presence of WBC casts and no bacteria?
Acute Interstitial Nephritits
Where in the kidney does the concentration of urine occur?
Tubule
What urine chemical is affected by light?
Bilirubin
What serious medical condition characterized by major shock and renal failure following a crushing injury to skeletal muscle.
Crush syndrome