Immediate Skin Testing

Question 0

What is the amount drawn up and the amount injected into the patient for an intradermal skin test?

Answer 0

Draw up 0.05 ml and than inject 0.02 ml.

Question 1

What extract concentration is considered “full strength” for prick testing?

Answer 1

Either 10,000 - 20,000 protein nitrogen units (PNU) per ml or a 1:10 or 1:20 weight-to-volume (w/v).
2.75 mg/ml.

Question 2

What are some advantages to prick skin testing?

Answer 2

Can test many antigens.

Inexpensive.

Question 3

What are some disadvantages to prick skin testing?

Answer 3

Risk of anaphylaxis during testing.
Poor wheal formation in children less than 2 years old.
Limited value in poorly controlled eczema.
Certain medications have to be stopped in advance (corticosteroids, antihistamines, etc.)

Question 4

Venom skin testing cannot be done unless under the supervision of who?

Answer 4

Board certified allergist

Question 5

Venom skin testing materials are available for which insects?

Answer 5

Honey bee.
Yellow jacket.
Yellow hornet.
White-faced hornet.
Wasp.
Fire ant.

Question 6

How long must you wait to read a venom skin test before moving on to the next strength?

Answer 6

15 minutes

Question 7

What do you measure for the wheal?

Answer 7

Induration.

Measure the widest area.

Question 8

What do you measure for the flare?

Answer 8

Redness.

Measure the widest area.

Question 9

Intradermal testing inject enough antigen for a ________ bleb at the site.

Answer 9

2 mm

Question 10

When doing venom testing your first strength for the testing should be ________?

Answer 10

0.0001 mcg/ml

Question 11

The first dilution made for venom testing is ________?

Answer 11

100 mcg/ml

Question 12

Any ________ reaction to venom testing must be reported to physician prior to continuing test placement.

Answer 12

Size