Cystic fibrosis (CF) is suspected in a toddler. Which test is essential in establishing this diagnosis?
Bronchoscopy
Serum calcium
Urine creatinine
Sweat chloride test
The Correct Answer is D
This test measures the amount of chloride in the sweat, which is abnormally high in people with cystic fibrosis (CF). CF is an inherited disorder that affects the cells that produce mucus, sweat, and digestive juices.
Choice A is wrong because bronchoscopy is a procedure that allows the doctor to examine the airways and lungs, but it is not essential for diagnosing CF.
Choice B is wrong because serum calcium is a blood test that measures the level of calcium in the blood, which is not related to CF.
Choice C is wrong because urine creatinine is a test that measures the amount of creatinine in the urine, which reflects the kidney function, but it is not relevant to CF.
Normal ranges for sweat chloride test are:
- Less than 40 millimoles per liter (mmol/L) for children and adults
- Less than 30 mmol/L for infants younger than 6 months
A sweat chloride level of more than 60 mmol/L is considered positive for CF.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
choice A.
Infant of an Rh-negative mother and a father who is Rh-positive and homozygous for the Rh factor.
Rh incompatibility occurs when a woman is Rh-negative and her baby is Rh-positive. This can cause hemolytic disease of the neonate (HDN), a condition where the mother’s antibodies destroy the baby’s red blood cells.
Choice B is wrong because if both the mother and the baby are Rh-negative, there is no risk of Rh incompatibility.
Choice C is wrong because if the father is heterozygous for the Rh factor, there is a 50% chance that the baby will be Rh-negative and not affected by Rh incompatibility.
Choice D is wrong because if both the mother and the baby are Rh-positive, there is no risk of Rh incompatibility.
Correct Answer is B
Explanation
This is because oil peppermint can stimulate the micturition reflex and help the woman to void.
Some possible explanations for the other choices are:
Choice A is wrong because pouring water over the perineum may not be enough to trigger the micturition reflex and may cause discomfort or infection.
Choice C is wrong because analgesics may not address the underlying cause of urinary retention and may have side effects such as drowsiness or nausea.
Choice D is wrong because inserting a sterile catheter is an invasive procedure that carries risks such as trauma, infection, or bladder spasms. It should be used only as a last resort after other methods have failed.
Normal ranges for postpartum bladder function are:
- Urine output: 3000 to 5000 mL/day for the first 2 to 3 days after delivery.
- Urine specific gravity: 1.005 to 1.030.
- Urine pH: 4.6 to 8.0.
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