Immediate Hypersensitivity Skin Testing Flashcards Preview

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Flashcards in Immediate Hypersensitivity Skin Testing Deck (33)
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1

Immediate Hypersensitivity Skin Testing is what Type on the Gel and Combs scale?

Type I

2

How long does it take for a reaction to occur with Immediate skin testing?

15 Minutes

3

What are the precautions for Immediate Skin Testing?

- Beta Blockers
- Certain Chronic Medical Conditions

4

What are the contraindications for Immediate Skin Testing?

- Severe asthma attack in the past two weeks
- Antihistimes
- Pregnancy
- Longtime Steroid Use

5

What are the two types of Immediate Skin Testing?

- Prick
- Intradermal

6

What are the advantages of Prick Skin Testing?

- Safer than ID
- Minimal systemic absorption
- Faster
- Less tedious for the technician
- Less discomfort for the patient

7

What are the disadvantages of prick skin testing?

- Chance of Cross Contamination
- Chance of Cross Reaction

8

What is the strength of the positive control for prick skin testing?

2.75 mg/ml

9

What is used for the negative control for prick skin testing?

- HSA
- Glycerin

10

What are the strengths of the extracts used for prick skin testing?

- 10,000 - 20,000 PNU/mL
- 1:10 or 1:20 W/V

11

What are the locations used for prick skin testing?

- Forearm
- Back

12

What are the two types of devices used for prick skin testing?

- Quintip
- Dermaprick

13

When placing prick skin testing how far apart must each prick be placed?

1 inch

14

Once a Prick skin test has been placed how long must one wait to read the test?

15 Minutes

15

When reading the prick skin test it should always be measured ____________ X __________

Wheal X Flare

16

A prick test with a diameter greater than _______ is considered positive?

>3 mm

17

What would cause a false positive for immediate Hypersensitivity Skin Testing?

- Technician Error
* Excessive strength of antigen
* Excessive dose of antigen
* Cross contamination
- Dermographic Patient

18

What would cause a false negative for immediate Hypersensitivity Skin Testing?

- Improperly prepared/stored extract
* bottle/label contents mismatched
* out dated extracts
- Patient took antihistamines
- Technician error
* Improper placement
- Intrinsic patient factors
* leathery skin

19

What are the advantages of Intradermal skin testing?

- More Sensitive
- Less chance of cross contamination

20

What are the disadvantages of Intradermal skin testing?

- More dangerous
- Causes more discomfort to the patient
- More tedious for the technician
- More irritant/ non-specific reactions

21

What are the extract strengths used for ID testing?

- 100 - 1,000 PNU/ml
- 1:500 or 1:1000 W/V

22

What is the strength of the positive control for ID testing?

0.275mg/ml

23

What is the positive control used for ID and prick skin testing?

Histamine

24

What is the negative control used for intradermal testing?

- Saline with HSA
- Saline with Phenol

25

What location is used for intradermal testing?

- Upper Arm- from the bend of the elbow to the middle of the deltoid
- Forearm
- Back

26

What devices are used for intradermal testing?

Tuberculin Syringes

27

When doing ID skin testing what amount of extract is drawn up?

0.05 mL

28

When doing ID skin testing what amount is injected?

0.02 mL or the size of a 2mm bleb

29

When can an ID test be read?

15 minutes after placement

30

Venom ID testing can only be preformed under the direct supervision of a _____________?

Board Certified Allergist