In which is a capillary blood specimen least likely to be indicated?
1. Testing a serum glucose level
2. Measuring a client's hematocrit
3. Obtaining blood specimens on an infant
4. Measuring an arterial blood gas
4
Rationale 1: Capillary blood collection is safe and effective for testing glucose.
Rationale 2: Capillary blood collection is safe and effective for testing hematocrit.
Rationale 3: Capillary blood collection is safe and effective and may be used for blood specimens on infants.
Rationale 4: Arterial blood gases require artery puncture, and cannot be performed on a capillary specimen; it is possible to perform a capillary blood gas, which is less effective than an arterial sample but is less invasive.
Global Rationale: Capillary blood collection is safe and effective for testing glucose and hematocrit, and may be used for blood specimens on infants. Arterial blood gases require artery puncture, and cannot be performed on a capillary specimen; it is possible to perform a capillary blood gas, which is less effective than an arterial sample but is less invasive.
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