A nurse is reporting a client's laboratory tests to the provider to obtain a prescription for the client's daily warfarin.
Which of the following laboratory tests should the nurse plan to report to obtain the prescription for the warfarin?

The correct answer is choice B: Axillary.

Choice B rationale: The axillary site, or under the arm, is the preferred site for obtaining the temperature of a newborn. This method is safe and generally well-tolerated by infants. It carries a lower risk of injury or discomfort compared to other methods.

Choice A rationale: Rectal temperature measurement can be accurate but is more invasive and may cause discomfort or injury to the newborn. It is generally not the preferred method for routine temperature checks in newborns.

Choice C rationale: Tympanic temperature measurement, which uses the ear canal, may not be accurate for newborns due to their small ear canal size and the presence of vernix caseosa or amniotic fluid.

Choice D rationale: Oral temperature measurement is not suitable for newborns as they cannot hold the thermometer in their mouth safely or reliably. This method is more appropriate for older children and adults.

Choice A rationale:

A client who received a Mantoux test 48 hr ago and has an induration does not require immediate follow-up care. An induration at the injection site indicates a positive reaction, but further evaluation and management are necessary, not urgent.

Choice B rationale:

A client taking warfarin with an INR of 1.8 requires follow-up care. The normal range for INR in a client taking warfarin is usually 2.0 to 3.0. An INR of 1.8 suggests inadequate anticoagulation, putting the client at risk of thromboembolic events. Dose adjustment or other interventions are needed to bring the INR within the therapeutic range.

Choice C rationale:

A client scheduled for a colonoscopy and taking sodium phosphate does not necessarily require immediate follow-up care. However, sodium phosphate can cause electrolyte imbalances, so monitoring for any signs of electrolyte disturbances is essential, but it does not mandate urgent intervention.

Choice D rationale:

A client taking bumetanide with a potassium level of 3.6 mEq/L requires follow-up care. The normal range for potassium is typically 3.5 to 5.0 mEq/L. A potassium level below the normal range (hypokalemia) can lead to cardiac arrhythmias and muscle weakness. The client may need potassium supplements or dietary adjustments to correct the imbalance.