An occupational health nurse is interpreting the results of a tuberculin skin test for a group of clients who received the test 48 hr ago. Which of the following clients should the nurse identify as having a positive test result?

Clamp the catheter tubing distal to the sampling port for 15 min. By clamping the tubing distal to the sampling port, it allows urine to accumulate in the tubing, ensuring that the urine specimen obtained is fresh and not from the stagnant urine that has been sitting in the tubing.

Wipe the sample port with an alcohol wipe and let the alcohol dry. Cleaning the sampling port with an alcohol wipe helps reduce the risk of introducing contaminants into the sample during collection, ensuring a more sterile procedure.

Attach a sterile needleless syringe to the sample port and aspirate the specimen. Using a sterile syringe prevents contamination and allows for the collection of a clean urine sample directly from the catheter tubing, maintaining the sterility of the specimen.

Empty the urine into a sterile container labeled with the client identifiers. Transferring the collected urine into a sterile container labeled with the client's identifiers ensures proper identification and handling of the specimen for laboratory analysis.

Document in the client's electronic medical record that the specimen was sent to the laboratory. Documenting in the client's medical record ensures that there is a clear record of the specimen collection, its handling, and its dispatch to the laboratory for analysis, maintaining proper documentation and continuity of care.

Choice A Reason:

A client whose injection site is scabbed is incorrect. Scabbing at the injection site does not provide information about the presence or absence of induration. It doesn't contribute to interpreting the test result directly.

Choice B Reason:

A client whose injection site is firm and measures 3 mm (0.1 in) is incorrect. A measurement of 3 mm of induration is generally considered a negative result for most individuals, including those without any risk factors for tuberculosis (TB).

Choice C Reason:

A client whose injection site has an elevated area measuring 15 mm (0.6 is correct. An area of induration measuring 15 mm or more is considered positive in individuals with no known risk factors for TB.

Choice D Reason:

A client whose injection site is ecchymotic is incorrect. Ecchymosis (bruising) at the injection site is not relevant to the interpretation of the tuberculin skin test. It does not contribute to determining a positive or negative result.