S1 [LAB]: URINE PERSERVATIVES Flashcards
Identify the urine preservative:
Prevents bacterial growth for 24h
Refrigeration
Identify the urine preservative:
Preserves glucose and sediments well
Thymol
Identify the urine preservative:
Raises specific gravity by hydrometer
Refrigeration
Identify the urine preservative:
Precipitates amorphous phosphates and urates
Refrigeration
Identify the urine preservative:
Does not interfere with chemical tests
Refrigeration
Identify the urine preservative:
Interferes with acid precipitation tests for protein
Thymol
Identify the urine preservative:
Preserves protein and formed elements well
Boric acid
Identify the urine preservative:
Does not interfere with routine analyses other than pH
Boric acid
Identify the urine preservative:
May precipitate crystals when used in large amounts
Boric acid
Identify the urine preservative:
Keeps pH at 6.0
Boric acid
Identify the urine preservative:
Is bacteriostatic at 18 g/L
Boric acid
Identify the urine preservative:
Interferes with drug and hormone analyses
Boric acid
Identify the urine preservative:
Excellent sediment preservative
Formalin
Identify the urine preservative:
Acts as a reducing agent, interfering with chemical tests for glucose, blood, leukocyte esterase, and copper reduction
Formalin
Identify the urine preservative:
Used to rinse the specimen container to preserve cells and casts
Formalin
Identify the urine preservative:
Does not interfere with routine tests
Toluene, Phenol
Identify the urine preservative:
Floats on surface of specimens and clings to pipettes and testing materials
Toluene
Identify the urine preservative:
Prevents glycolysis
Sodium fluoride
Identify the urine preservative:
Good for drug analysis
Sodium fluoride
Identify the urine preservative:
Inhibits reagent strip tests for glucose, blood, and leukocytes
Sodium fluoride
Alternative for fluoride in sodium fluoride preservative in reagent strip testing
Sodium benzoate
Identify the urine preservative:
Causes odor change
Phenol
How many drops of phenol per ounce of specimen is used?
1
Identify the urine preservative:
Convenient when refrigeration is not possible
Commercial preservative tablet
Identify the urine preservative:
Have controlled concentration to minimize interference
Commercial preservative tablet
Identify the urine preservative:
May contain one or more of the preservatives including sodium fluoride
Commercial preservative tablet
Identify the urine preservative:
Sample is stable at room temperature for 48h; preserves bacteria
Gray C&S tube
Identify the urine preservative:
Used on automated instruments
Yellow plain UA tube
Identify the urine preservative:
Decreases pH level
Gray C&S tube
Preservative of gray C&S tube
Boric acid
Identify the urine preservative:
Not used if urine is below minimum fill line
Gray C&S tube
The use of yellow plain UA tube requires refrigeration for ___ hours
2
Identify the urine preservative:
Stable for 72 hours at RT; instrument-compatible
Cherry red/ Yellow top tube
Identify the urine preservative:
Bilirubin and urobilinogen may be decreased if specimen is exposed to light and left at RT
Cherry red/ Yellow top tube
Preservative of cherry red/ yellow top tube
Sodium propionate
Identify the urine preservative:
Preserves cellular elements
Saccomanno fixative
Identify the urine preservative:
Used for cytology studies
Saccomanno fixative
