speciic gravity in urinalysis

NCLEX-RN

NCLEX RN Predictor Exam

1. Specific gravity in urinalysis:

A. compares the concentration of urine to that of distilled water
B. is useless when the patient is dehydrated
C. can only be measured using a refractometer
D. None of the above

Correct answer: A

Rationale: Specific gravity in urinalysis measures the concentration of solutes in urine compared to that of distilled water. This comparison helps in assessing the kidney's ability to concentrate urine properly. It is a valuable test even in dehydrated patients as it provides insights into renal function. Specific gravity can be measured using various methods, including a refractometer or reagent strips. Normal specific gravity readings of human urine typically range from 1.005 to 1.030. Choice A is correct as it accurately describes the purpose of specific gravity in urinalysis. Choices B and C are incorrect as specific gravity remains relevant in dehydrated patients and can be measured using different techniques, not solely a refractometer.

2. A nurse is preparing to insert a small-bore nasogastric feeding tube for a client's enteral feedings. In which method does the nurse measure the correct length of the tube?

A. From the tip of the nose to the xiphoid process
B. From the tip of the nose to the earlobe to the xiphoid process
C. From the earlobe to the xiphoid process
D. From the tip of the nose to the earlobe to the umbilicus

Correct answer: B

Rationale: When preparing to insert a nasogastric tube, the nurse must measure the correct length to ensure that the end of the tube will be in the correct position in the stomach. The accurate method to measure the length is from the tip of the nose to the earlobe to the xiphoid process. This length ensures that the end of the tube reaches the stomach, avoiding placement in the small intestine or esophagus. Choice A is incorrect as it does not include the earlobe, which is essential for accurate measurement. Choice C is incorrect because measuring from the earlobe alone does not provide the correct length for positioning in the stomach. Choice D is incorrect as it includes the umbilicus, which is not the appropriate landmark for measuring the length of a nasogastric tube intended for stomach placement.

3. A 4-month-old child is at the clinic for a well-baby checkup and immunizations. Which of these actions is most appropriate when the nurse is assessing an infant's vital signs?

A. The infant's radial pulse should be palpated, and the nurse should notice any fluctuations resulting from activity or exercise.
B. The nurse should auscultate an apical rate for 1 minute and then assess for any normal irregularities, such as sinus dysrhythmia.
C. The infant's blood pressure should be assessed by using a stethoscope with a large diaphragm piece to hear the soft muffled Korotkoff sounds.
D. The infant's chest should be observed and the respiratory rate counted for 1 minute; the respiratory pattern may vary significantly.

Correct answer: B

Rationale: The nurse auscultates an apical rate, not a radial pulse, with infants and toddlers. The pulse should be counted by listening to the heart for 1 full minute to account for normal irregularities, such as sinus dysrhythmia. Children younger than 3 years of age have such small arm vessels; consequently, hearing Korotkoff sounds with a stethoscope is difficult. The nurse should use either an electronic blood pressure device that uses oscillometry or a Doppler ultrasound device to amplify the sounds. An infant's respiratory rate should be assessed by observing the infant's abdomen, not chest, because an infant's respirations are normally more diaphragmatic than thoracic. The nurse should auscultate an apical heart rate, not palpate a radial pulse, with infants and toddlers.

4. Which of the following is an example of an environmental hazard that may put the healthcare professional at risk of injury?

A. Loud noise from the hospital maintenance system
B. Airborne powder containing latex
C. Chemicals containing ethylene oxide
D. All of the above

Correct answer: D

Rationale: Healthcare professionals, including nurses, are exposed to various environmental hazards that may negatively impact their physical or mental health. Hazards come in several forms, such as loud noise from hospital systems, which can damage hearing; airborne latex powder, leading to allergic reactions; and chemicals like ethylene oxide, a sterilizing agent that can cause cancer. Therefore, all the options listed pose risks to healthcare professionals, making 'All of the above' the correct answer. Choice A, loud noise, is a hazard that can affect hearing health. Choice B, airborne latex powder, can trigger allergic responses. Choice C, chemicals containing ethylene oxide, are hazardous and can lead to serious health issues. Each option represents a distinct environmental risk that healthcare professionals should be aware of and take precautions against.

5. Intermittent fevers are:

A. fevers which come and go.
B. fevers which rise and fall but are always considered above the patient's average temperature.
C. fevers which fluctuate more than three degrees and never return to normal.
D. None of the above.

Correct answer: A

Rationale: Intermittent fevers are characterized by periods of fever followed by periods of normal body temperature. They alternate between being febrile and afebrile. Continuous fevers show minimal fluctuations over a 24-hour period, while remittent fevers fluctuate significantly but do return to normal body temperature. Choice A is correct as it accurately describes intermittent fevers. Choices B and C are incorrect as they do not fully capture the defining characteristic of intermittent fevers, which involve cyclical episodes of fever and normal temperature. Choice D is incorrect as there is a specific definition for intermittent fevers.