Urine Preservatives Flashcards
Preserves Glucose and sediments well
Thymol
Is a good preservative for drug analysis
Sodium flouride
Does not interfere with routine test
Toluene
Raises SG by hydrometer
Refrigeration
Excellent sediment preservative
Formalin
Inhibits reagent strip tests for Glucose , Blood and Leukocyte
Sodium Fluoride
Does not interfere with routine analysis other than pH
Boric Acid
Floats on surface of specimens and clings to pipettes and testing material
Toluene
Keeps pH at about 6.0
Boric Acid
Used for cytology Studies
Saccomanno Fixative
causes an Odor Change and uses 1 drop per ounce of specimen
Phenol
Name the 4 preservatives that does not interfere in Routine urinalysis
Refrigeration
Phenol
Toluene
Boric acid other than pH
Precipitates amorphous phosphates and urates
Refrigeration
Interferes with acid precipitation test for protein
Thymol
Boric acid is bacteriostatic at ___g/L ;
18g/L
Acts as a reducing agent interfering with chemical tests for Glucose , Blood , Leukocyte esterase and copper reduction
Formalin
Prevents Glycolysis
Sodium fluoride
May precipitate crystals when used in large amount
Boric Acid
Prevents bacterial Growth 24h3
Refrigeration
Temperature use in Refrigeration
2-8*C
Can use for culture transport
Boric Acid
May contain one or more of the preservatives including sodium fluoride
Commercial Preservative tablet
Preservative use in Gray C&S tube
Boric acid
Preservative use in Cherry red / yellow top tube
Sodium propionate
Tubes that use n automated instruments
Yellow plain UA tube
Tubes that are stable for 72 hours at RT, instrument compatible , preserves bacteria
Cherry red / Yellow Top Tube
Interferes with drug and hormone analyses
Boric acid
Yellow plain UA tube must be refrigerate within __ hours
2hrs
Tube that decreases pH ; Do not use if urine is below minimum fill line
Gray C&S tube
in Gray top tube UA if the preservative is boric acid may not be used for UA . True or False
True
