Specimen Collection and Handling Flashcards Preview

Clinical Chemistry > Specimen Collection and Handling > Flashcards

Flashcards in Specimen Collection and Handling Deck (35):
0

Withdraw needle if ____, _____, and _____.

Patient is experiencing excruciating pain
Hematoma begins to form
Patient begins to faint

1

Used to preserve CSF samples

Fluoride oxalate

4

Why should testing of CSF not be delayed?

Cells are rapidly lysed
Glucose is rapidly destroyed

5

CSF clots completely when

Spine is constricted

6

Tests affected by age

Cholesterol
Urate
Alkaline phosphatase

8

Pre-analytical factors

Physiological variables
Errors in specimen collection
Misidentification of samples

10

Post-analytical factors

Communication
Technical errors
Post-examination labeling and identification

11

Key issues in specimen collection

Consider differential diagnoses
Decide on tests to be conducted
Decide n clinical samples to be collected

13

Set the standards of practice

Clinical and Laboratory Standards Institute

15

Serum sample

Venous blood

16

Temperature and time for clot retraction

4-8 C
At least 1-2 hours

17

Purpose of collecting 24-hour urine specimen

Evaluation of kidney function

18

Why should repeated freeze-thaw cycles be avoided?

This causes destruction of IgM.

20

Screens substances which are indicators of kidney infection or other pathology

Random urine specimen

21

How do we avoid hemolysis of blood?

Do not freeze unseparated blood.

22

Content of case investigation forms

Patient information
Clinical information
Laboratory information
Line listing

23

Tests affected by food intake

Glucose
Triglycerides
Phosphate

24

Temperature requirement if serum sample is stored for weeks or months

-20 C

26

Characteristic of purulent meningitis

Large clots

27

Test tubes of fresh blood should be

Rinsed in cold water
Left to soak in detergent solution

29

Tests affected by stress

Cortisol
Prolactin
Growth hormone
Catecholamines
Glucose

31

Laboratory investigation standards

Advance planning
Collection of adequate and appropriate specimens
Sufficient documentation
Biosafety and decontamination
Correct packaging
Rapid transport
Choice of laboratory that can accurately perform the tests
Timely communication of results

32

Test tubes of old blood should be

Filled with 10% solution of household bleach
Left for 12 hours
Rinsed and cleaned

33

Affect triglycerides

Body mass

34

Most concentrated sample for urine

Early morning urine specimen

35

Temperature requirement for transport that lasts less than 10 days

4-8 C

37

Test tubes of old blood kept for several days may contain

Microorganisms

38

Effusion collection sites

Pleural cavity
Peritoneal cavity
Pericardial cavity
Synovial joint
Bursa

39

Characteristic of tuberculous meningitis

Single or numerous fine clots

40

Cerebrospinal fluid collection

Lumbar puncture
Sterile tubes
Aseptic conditions
Trained person

47

Patient Observations

Patient alertness
Patient emotional and mental status
IV lines
Injuries
Prior mastectomy
Presence of edema
Medications

49

Tests affected by posture

Renin
Aldosterone
Plasma proteins

53

Inherent on the methods of analysis

Analytical factors

60

Tests affected by time

Cortisol (diurnal variation)
Gonadotrophins (catamenial variation in women)
25-hydroxycholecalciferol (seasonal variation)

66

Tests affected by sex

Gonadal steroids
Gonadotrophins
HDL cholesterol