Upgrade to remove ads
Procedure 19: TB Test Administration
Purpose: To administer a TB skin test. Equipment: Gloves, 70% isopropyl alcohol pad, tuberculin syringe, 1/2 inch 27-gauge safety needle, TB antigen, permanent ink pen.
Terms in this set (12)
Identify the patient, explain the procedure, and sanitize hands. Correct identification is vital to patient safety and meaningful test results. Proper hand hygiene plays a role in infection control by protecting the phlebotomist, patient, and others from contamination. Gloves are sometimes put on at this point. Follow facility protocol.
Support the patient's arm on a firm surface and select a suitable site on the volar surface of the forearm, below the antecubital crease. The arm must be supported to minimize movement during test administration. Areas with scars, bruises, burns, rashes, excessive hair, or superficial veins must be avoided as they can interfere with interpretation of the test.
Clean the site with 70% isopropyl alcohol and allow it to air dry. Cleaning with antiseptic and allowing it to air-dry permits maximum antiseptic action.
Put on gloves at this point if you have not already done so. Gloves are necessary for safety and infection control.
Clean the top of the antigen bottle and draw 0.1 mL of diluted antigen into the syringe. The top of the bottle must be clean to prevent contamination of the antigen.
Stretch the skin taut with the thumb in a manner similar to venipuncture and slip the needle just under the skin at a very shallow angle (approximately 10- to 15-degrees). The skin must be taut so the needle will slip into it easily. The antigen must be injected just beneath the skin for accurate interpretation of results.
Pull back on the syringe plunger slightly to make certain a vein has not been entered. The antigen must not be injected into a vein.
Slowly expel the contents of the syringe to create a distinct, pale elevation commonly called a bleb or wheal. Appearance of this bleb or wheal is a sign that the antigen has been injected properly.
Without applying pressure or gauze to the site, withdraw the needle, activate the safety feature, and discard the needle in a sharps container. Applying pressure could force the antigen out of the site. Gauze might absorb the antigen. Both actions could invalidate test results. Activation of the safety feature and prompt needle disposal minimizes chances of an accidental needlestick.
Ensure that the arm remains extended until the site has time to close. Do not apply a bandage. A bandage can absorb the fluid or cause irritation, resulting in misinterpretation of test results.
Check the site for a reaction in 48- to 72-hours. This is called "reading" the reaction. Maximum reaction is achieved in 48- to 72-hours. A reaction can be underestimated if read after this time.
Measure induration (hardness) and interpret the results. Do not measure erythema (redness).
- Negative: Induration absent or less than 5 mm in diameter.
- Doubtful: Induration between 5- and 9-mm in diameter.
- Positive: Induration 10-mm or greater in diameter.
A TB reaction is interpreted according to the amount of induration or firm raised area due to localized swelling. The health status and age of the individual are important considerations when interpreting results. 5 mm of induration can be considered a positive test result in patients who are immunosuppressed due to chronic medical conditions.
THIS SET IS OFTEN IN FOLDERS WITH...
Procedure 16: GTT Procedure
Procedure 17: Bleeding-Time Test
Table of Contents
Procedure 18: Pregnancy Testing
YOU MIGHT ALSO LIKE...
Infant Heal Punctures (Heel Stick) Procedure
Capillary Puncture Steps
Phlebotomy - 28 STEPS TO DRAWING BLOOD
Phlebotomy - 28 STEPS TO DRAWING BLOOD
OTHER SETS BY THIS CREATOR
Chapter 3: The Skeletal System
Chapter 2: The Human Body in Health and Disease
Abbreviations and Their Meanings
Chapter 1: Introduction to Medical Terminology