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Flashcards in Lab Final Deck (26)
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1

What do the colors of the hazard diamond stand for?

Red-Flammable
Blue-Health
Yellow-Reactivity
White-Special

2

What is the difference between serum and plasma?

Serum has no anticoagulant, plasma has anticoagulant

3

Accuracy

How close a test result is to the true value

4

Precision

Describes how close the test results are when they are repeated

5

Quality Control

A process that monitors the accuracy and precision of results through use of control systems

6

Calibration

The comparison of an instrument measure or reading to a known physical constant

7

Standards

Highly purified substances of known value used for calibration

8

Sensitive

The proportion of cases with a specific disease that gives a positive result (fewer false negatives)

9

Specificity

The proportion of cases with an absence of disease that gives a negative result (fewer false positive)

10

Renal Epi Cells

Epi cells that come from the Nephron and are not normally seen in the urine

11

Transitional Epi Cells

Epi cells that come from the uterers and bladder and are not normally seen in the urine

12

Squamous Epi Cells

Epi cells tat come from the urethra and are normally found in the urine

13

First morning Urine

Concentrated urine where formed elements are better presented

14

Random Urine

Most common urine sample, includes clean catch, may not accurately reflect condition

15

Timed Urine

Urine test done on diurnally variable disorders, often a preservative is added, regulation of food and drugs often required

16

Urine

An ultrafiltrate of plasma

17

How can light and temperature effect a urine sample?

Oxidation/reduction of solutes, bacterial growth increasing nitrates and pH and decreasing glucose, Precipitation of solutes,

18

What does a persitent foam upon shaking a urine sample mean about the sample?

Protein, white foam is albumin, yellow foam is bilirubin

19

Hematuria

An increase in RBCs in the urine

20

Leukocyte esterase

Looks for azurophilic granules of leukocytes in urine as an indication of infection

21

Nitrate Urine Test

Looks for nitrate reducing bacteria, urine must be in bladder for at least 4 hours

22

What is a normal glucose level?

less than 160-180 mg/gL

23

Bright Field Microscopy

Most common

24

Phase-Contrast Microscopy

Ideal for urine sediments, low refraction of living cells and components

25

Polarizing Microscopy

Confirms presence of cholesterol

26

Inference Contrast Microscopy

3-D images, high cost prevents use in most labs