SPX PRESERVATION CM
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29 Terms
Refrigeration
Does not interfere with chemical tests
Refrigeration
Precipitates amorphous phosphate (brown) and urates (pink)
Refrigeration
Prevents bacterial growth for 24 hours
Thymol
Preserves glucose and sediments well
Thymol
Interferes with Acid Precipitation Test for protein
Boric acid
Preserves protein and formed elements well;
Does not interfere with routine tests other than pH
Boric acid
May precipitate crystals when used in large amounts
Boric acid
Keeps pH at about 6.0;
Bacteriostatic at 18g/dL;
For culture transport
Formalin (Formaldehyde)
Excellent sediment preservative
Formalin (Formaldehyde)
Reducing agent;
Interfere with chemical tests for glucose, blood, LE, and copper reduction
Toluene
Does not interfere with routine tests
Toluene
Floats on the surface of specimens and clings to pipettes and testing materials
Sodium fluoride
Prevents glycolysis;
Good preservative for drug analyses
Sodium fluoride
Inhibits reagent strip tests for glucose, blood, and leukocytes
Sodium fluoride
May use sodium benzoate instead of fluoride for reagent strip testing
Phenol
Does not interfere with routine tests
Phenol
Causes an odor change
Commercial preservative tablets
Convenient when refrigeration is not possible;
Have controlled concentration to minimize interference
Commercial preservative tablets
May contain one or more of the preservative including sodium fluoride
Gray C&S tube
Sample stable at RT for 48 hours;
Preserves bacteria
Gray C&S tube
Decreases pH;
Do not use if urine is below minimum fill line
Gray C&S tube
Preservative is boric acid and may not be used for UA
Yellow plain UA tube
Use on automated instruments
Yellow plain UA tube
Must refrigerate within 2 hours
Cherry red/Yellow top tube
Stable for 72 hours ar RT;
Instrument-compatible
Cherry red/Yellow top tube
Bilirubin and urobilinogen may be decreased if specimen is exposed to light and left at RT
Cherry red/Yellow top tube
Preservative is sodium propionate;
Conical bottom
Saccomanno fixative
Preserves cellular elements
Saccomanno fixative
Used for cytology studies
Note 
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