1.2 URINE PRESERVATIVE - LEC

Question 1

Types of urine preservatives

Answer 1

Refrigeration
Acids
Formalin
Sodium fluoride
Commercial preservative tablets
Urine collection kits
Culture and sensitivity tubes
Yellow UA plus tube
Cherry red/yellow preservative plus tube

Question 2

Advantage of Refrigeration

Answer 2

Does not interfere with chemical tests

Question 3

Advantages of Acids

Answer 3

Prevents bacterial growth and metabolism

Question 4

Advantages of Formalin

Answer 4

Excellent sediment preservative

Question 5

Advantages of Sodium fluoride

Answer 5

Good preservative for drug analyses

Question 6

Advantages of Commercial preservative
tablets

Answer 6

Convenient when refrigeration not possible

Have controlled concentration to minimize interference

Question 7

Advantages of Urine Collection Kits

Answer 7

Contains collection cup, transfer straw, culture and sensitivity (C&S) preservative tube, or UA tube

Question 8

Advantages of Light gray and gray
C&S tube

Answer 8

Specimen stable at room temperature (RT) for
48 hours

prevents bacterial growth and
metabolism

Question 9

Advantages of Yellow UA Plus tube

Answer 9

Use on automated instruments

Question 10

Advantages of Cherry red/yellow Preservative Plus tube

Answer 10

Specimen stable for 72 hours at RT;
instrument-compatible

Question 11

Disadvantages of Refrigeration

Answer 11

Precipitates amorphous phosphates and urates

Question 12

Disadvantages of Acids

Answer 12

Interferes with analysis of drugs and hormones

Question 13

Disadvantages of Formalin

Answer 13

Acts as a reducing agent,

interfering with chemical tests for glucose, blood, leukocyte esterase, and copper reduction

Question 14

Disadvantages of Commercial preservative
tablets

Answer 14

Check tablet composition to determine possible effects on desired tests

Question 15

Disadvantages of Sodium fluoride

Answer 15

Inhibits reagent strip tests for glucose, blood, and leukocytes

Question 16

Disadvantages of Light gray and gray
C&S tube

Answer 16

Do not use if urine is below
minimum fill line

Question 17

Disadvantages of Yellow UA Plus tube

Answer 17

Must refrigerate within 2 hours

Question 18

Disadvantages of Cherry red/yellow
Preservative Plus tube

Answer 18

Must be filled to minimum fill line
Bilirubin and urobilinogen may be decreased if specimen is exposed to light and left at RT

Question 19

Prevents bacterial growth for 24 hours

Answer 19

Refrigeration

Question 20

Keeps pH at about 6.0 Can be used for transport of urine cultures

Answer 20

Acids

Question 21

Rinse specimen container with _________ to preserve cells and casts

Answer 21

formalin

Question 22

Light and gray C and S tube preservatives

Answer 22

boric acid,
sodium borate
sodium formate

Question 23

Round or conical bottom, no preservative tube

Answer 23

Yellow UA Plus tube

Question 24

Cherry red/ yellow preservative plus tubes preservatives

Answer 24

sodium propionate,
ethyl paraben,
chlorhexidine

Question 25

Urine Collection Kits examples

Answer 25

Becton,
Dickinson,
Rutherford,
NJ

Question 26

Acids examples

Answer 26

boric acid,
HCL,
acetic acid,
tartaric acid