A physician tells the nurse that a patient's skull is normocephalic.
This finding during the physician's inspection reveals:

Step 1: Refer to LABEL #2- CEFTRIAXONE. The label indicates that for IM administration, 0.5 g (500 mg) can be reconstituted with 1.8 mL of diluent to yield a concentration of 250 mg/mL.

Step 2: The question asks for the drug dosage after reconstitution for IM administration. The label explicitly states 250 mg/mL. Answer: 250 mg/mL.

Choice A rationale

Frostbite causes localized tissue damage due to ice crystal formation and cellular dehydration, leading to impaired circulation. While frostbite can affect capillary refill, a 5-second refill time in the absence of cold exposure or other correlating symptoms makes frostbite a less likely primary consideration and requires broader assessment.

Choice B rationale

Venous insufficiency involves impaired blood return to the heart, leading to venous stasis and edema. Capillary refill primarily assesses arterial perfusion and microcirculatory integrity, not venous outflow. Therefore, venous insufficiency would not typically manifest as a prolonged capillary refill time as a primary symptom.

Choice C rationale

Normal capillary refill time in adults is typically less than 2 seconds. A 5-second capillary refill time indicates impaired peripheral perfusion, suggesting inadequate blood flow to the capillaries. This delay warrants further investigation to identify underlying causes such as dehydration, hypovolemia, or peripheral vascular compromise.

Choice D rationale

Normal capillary refill time is typically less than 2 seconds. A 5-second refill time is significantly prolonged and indicates compromised peripheral circulation. Considering this normal would lead to a missed opportunity to identify and address a potentially serious underlying physiological issue affecting tissue perfusion.