The nurse correctly understands that he should use a skin puncture for diagnostic tests in which of the following circumstances? Select all that apply
1. When the patient is younger than 2 years.
2. When the veins are inaccessible.
3. When a patient's fingers are calloused.
4. When a simpler way to obtain blood is desirable.
5. If the test requires a large volume of blood.
ANS: 1, 2, 4
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