Correct Answer: C

Rationale: In a client with diabetic ketoacidosis (DKA), the most concerning laboratory value is an arterial pH of 7.20. An arterial pH of 7.20 indicates severe acidosis, which is a critical condition requiring immediate intervention. This pH level reflects a significant imbalance in the body's acid-base status, potentially leading to serious complications. High blood glucose levels (choice A) are expected in DKA but do not directly indicate the severity of acidosis. A serum bicarbonate level of 18 mEq/L (choice B) is low but not as immediately critical as a pH of 7.20. Serum potassium of 5.5 mEq/L (choice D) is elevated, which can occur in DKA due to insulin deficiency, but it is not the most concerning value in this scenario.

Correct Answer: A

Rationale: Proper surgical hand-washing technique involves washing with the hands held higher than the elbows. This positioning is essential to ensure proper rinsing and to prevent the risk of contamination. Option B, using an alcohol-based hand rub for 30 seconds, is not specific to surgical hand-washing and is more commonly used for routine hand hygiene. Option C, scrubbing hands and forearms for 2 minutes with soap and water, is excessive and not typically required for routine hand-washing. Option D, washing hands with soap and water for only 15 seconds, is insufficient for thorough surgical hand-washing.

Correct Answer: C

Rationale: The correct answer is C. Colorectal cancer screening for individuals at average risk typically begins at age 50. One of the recommended options for routine screening is a fecal occult blood test done annually. Choice A is incorrect as blood samples are not used for routine colorectal cancer screening. Choice B is incorrect because colonoscopies usually start at age 50, not 60. Choice D is incorrect as sigmoidoscopies are recommended every 5 years, not every 10 years, for individuals at average risk for colon cancer.

Correct Answer: C

Rationale: The correct answer is C: Prothrombin time (PT). Prothrombin time is monitored to assess the therapeutic response to warfarin therapy. Warfarin works by inhibiting vitamin K-dependent clotting factors, which prolongs the PT. Monitoring PT helps determine if the client's blood is clotting within the desired therapeutic range. Choices A, B, and D are incorrect because bleeding time, coagulation time, and partial thromboplastin time are not specifically used to monitor the therapeutic response to warfarin. Bleeding time assesses platelet function, coagulation time is a general term and not a specific test, and partial thromboplastin time is more relevant in monitoring heparin therapy, not warfarin.

Correct Answer: A

Rationale: In medication wastage situations involving controlled substances, it is crucial to have a second nurse observe and verify the disposal process. This practice ensures accountability and prevents any mishandling or diversion of the medication. Choice B is incorrect because notifying the pharmacy is not the immediate action required in this scenario. Choice C is incorrect as locking the remaining medication in the controlled substance cabinet without proper witnessing does not ensure accountability. Choice D is incorrect as disposing of the vial with the remaining medication in a sharps container does not address the need for a witness to verify the wastage of the controlled substance.