Ch. 3 - Urine Preservatives & Types of Specimens (General) Flashcards Preview

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Flashcards in Ch. 3 - Urine Preservatives & Types of Specimens (General) Deck (34)
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1

What urine preservative does not interfere with chemical tests and prevents bacterial growth?

Refrigeration

2

What are the disadvantages of refrigeration?

Raises specific gravity by hydrometer
Precipitates amorphous phosphates and urates

3

What urine preservative preserves glucose and sediments well?

Thymol

4

What are the disadvantages of using thymol as a preservative?

It interferes with acid precipitation tests for protein

5

What urine preservative preserves protein and formed elements well and does not interfere with routine analyses other than pH? It keeps pH at about 6.0

Boric acid

6

The disadvantage of this urine preservative is that it may precipitate crystals when used in large amounts and can interfere with drugs and hormone analyses

Boric acid

7

What urine preservative is an excellent sediment preservative?

Formalin (formaldehyde)

8

The disadvantage of this urine preservative is that it acts as a reducing agent, interfering with chemical tests for glucose, blood, leukocyte esterase, and copper reduction.

Formalin (formaldehyde)

9

What urine preservatives do not interfere with routine tests?

Toluene
Phenol

10

The disadvantage of this urine preservative is that it floats on surface of specimens and clings to pipettes and testing materials.

Toluene

11

What urine preservative prevents glycolysis and is a good preservative for drug analysis?

Sodium flouride

12

The disadvantage of this urine preservative is that it inhibits reagent strip tests for glucose, blood, and leukocytes

Sodium flouride

13

It is a urine preservative that is convenient when refrigeration is not possible and has controlled concentration to minimize interference.

Commercial preservative tablets

14

The disadvantage of this urine preservative is that it may contain one or more of the preservatives including sodium flouride

Commercial preservative tablets

15

The disadvantage of this urine preservative is that it causes on odor change.

Phenol

16

It is a urine preservative that contains collection cup, C&S preservative tube or UA tube

Urine Collection Kit^6 (Becton Dickinson, Rutherford, NJ)

17

It is a urine preservative that has no noted disadvantages

Urine Collection Kit^6 (Becton Dickinson, Rutherford, NJ)
Saccomanno Fixative

18

It is a urine preservative that preserves bacteria and has the sample stable at room temperature for 48 hrs.

Gray C&S tube

19

The disadvantage of this urine preservative is that it decreases pH. It should not be used when urine is below minimum fill line.

Gray C&S tube

20

It is a urine preservative that is used on automated instruments

Yellow plain UA tube

21

The disadvantage of this urine preservative is that it must be refrigerate within 2 hrs

Yellow plain UA tube

22

It is a urine preservative that is stable for 72 hrs at RT and is instrument-compatible

Cherry red/yellow top tube

23

The disadvantage of this urine preservative is that it may decrease bilirubin and urobilinogen if specimen is exposed to light and left at RT

Cherry red/yellow top tube

24

It is a urine preservative that preserves cellular elements and is used for cytology studies

Saccomanno Fixative

25

The type of specimen used for routine screening only

Random

26

The type of specimen used for routine screening, pregnancy tests, and orthostatic protein

First morning

27

The type of specimen used for diabetic screening/monitoring

Fasting (Second morning)

28

The type of specimen used for diabetic monitoring

2-hour postprandial

29

The type of specimen that is optional with blood samples in glucose tolerance tests

Glucose tolerance test

30

The type of specimen used for quantitative chemical analysis

24-h (or timed)