A nurse is collecting data from a client who is taking prednisone and self-administers insulin daily. The nurse should identify that which of the following findings indicates a medication interaction?

A. Excoriation. Excoriation (skin abrasion or scratching) does not indicate a positive tuberculin skin test. A positive reaction is determined by induration (firm swelling) rather than skin irritation or superficial damage. Scratching the site can cause redness, but this is not a diagnostic sign of tuberculosis exposure.

B. Firmness. A positive tuberculin skin test is identified by the presence of induration (firm, raised swelling) at the injection site, which is measured in millimeters. The size of induration considered positive depends on the client’s risk factors. For example, ≥5 mm is positive in immunocompromised individuals, ≥10 mm in high-risk populations, and ≥15 mm in individuals with no risk factors.

C. Ulceration. Ulceration is not a typical reaction to a tuberculin skin test. If ulceration occurs, it may indicate improper injection technique, irritation, or an allergic reaction, rather than a true positive result. The test should be repeated in such cases.

D. Bleeding. Minor pinpoint bleeding at the injection site may occur due to the needle puncture but does not indicate a positive result. The key indicator of a positive test is the presence of measurable induration, not redness, bruising, or bleeding.

A. Breastfeeding. Ceftriaxone is generally considered safe during breastfeeding because only a small amount is excreted in breast milk. While monitoring for gastrointestinal disturbances or thrush in the infant is advised, breastfeeding is not a contraindication for ceftriaxone use.

B. Client allergy. The client has a penicillin allergy, which raises concerns about cross-reactivity with cephalosporins, including ceftriaxone. Although the cross-reactivity rate is low, clients with a history of severe allergic reactions (e.g., anaphylaxis, angioedema, or urticaria) to penicillin should avoid cephalosporins. The nurse should clarify the nature of the penicillin allergy before administering ceftriaxone.

C. Gentamycin prescription. Ceftriaxone and gentamicin are both nephrotoxic, and using them together increases the risk of kidney damage. The client should be monitored for renal function impairment, and alternative antibiotic therapy may be considered if necessary. The nurse should discuss this potential drug interaction with the provider before administration.

D. Hematocrit. The client’s hematocrit (32%) is low but does not require withholding ceftriaxone. A slightly decreased hematocrit is expected postpartum, especially in cases of infection or recent delivery. Ceftriaxone is not known to cause significant hematologic suppression that would make this a contraindication.

E. Hemoglobin. The client’s hemoglobin (9 g/dL) is lower than normal, likely due to postpartum blood loss or infection-related inflammation. However, ceftriaxone does not directly affect hemoglobin levels, so this is not a reason to withhold the medication.