A nurse is reviewing laboratory results for a client who is taking warfarin. Which of the following laboratory tests determines if the dose of medication is within the recommended target range?

Choice A reason: Suctioning the ET removes secretions obstructing airflow, increasing peak airway pressure. Mucus buildup narrows the airway, triggering alarms. Clearing secretions restores patency, reduces pressure, and prevents complications like atelectasis or hypoxia, critical for effective ventilation in mechanically ventilated clients.
Choice B reason: Verifying ET placement ensures the tube is in the trachea. Misplacement, like esophageal intubation, increases airway resistance, elevating peak pressure. Confirmation via capnography or X-ray prevents hypoxia, ensuring proper ventilation and safety in clients on mechanical ventilators.
Choice C reason: Checking for kinks in ventilator tubing addresses mechanical obstructions raising peak airway pressure. Kinks restrict airflow, triggering alarms. Straightening tubing restores normal gas delivery, reducing resistance and maintaining effective ventilation, preventing hypoxia in mechanically ventilated clients.
Choice D reason: Administering a bronchodilator relieves bronchospasm, a common cause of high peak airway pressure. Bronchoconstriction narrows airways, increasing resistance. Bronchodilators relax smooth muscles, improving airflow and reducing pressure, addressing reversible causes like asthma in ventilated clients.
Choice E reason: Increasing tidal volume exacerbates high peak airway pressure, risking barotrauma or lung injury by forcing air against resistance. Addressing underlying causes like secretions or bronchospasm is safer, as higher volumes do not resolve the root issue, potentially worsening outcomes.

Choice A reason: Touching the inner surface of a sterile drape first contaminates it, as only sterile gloves should contact this area. Outer edges are handled to maintain sterility, so this action violates sterile technique, making it incorrect.
Choice B reason: Placing items within a 1-inch border of the drape is incorrect, as this border is considered non-sterile. Sterile items must be placed centrally to avoid contamination, so this action breaches sterile field principles, making it incorrect.
Choice C reason: Holding sterile instruments above the waist and away from the body maintains sterility, as areas below the waist or close to the body are considered contaminated. This aligns with aseptic technique, making it the correct action for sterile field preparation.
Choice D reason: Pouring solution from 12 inches above risks splashing, contaminating the sterile field. Solutions should be poured from 4-6 inches to control flow and maintain sterility, so this action is incorrect and unsafe for sterile procedures.