The nurse teaches the client about arterial blood gases. Which does the nurse include in client teaching?
1. Venous blood is a fair index of oxygen levels.
2. Arterial blood has not reached the capillaries.
3. Urine output is an index for acid-base balance.
4. Venous blood assesses acid-base balance well.
2
2. The nurse explains to the client that arterial blood has not flowed through the ca-pillaries; therefore, the tissues have not extracted oxygen from the blood or deposited waste into the blood, processes that occur in the capillaries where gases and small molecules diffuse. Arterial blood is the most useful blood to the client.
1. Venous blood has a lower oxygen tension than arterial blood.
3. Urine output is a nonsensitive indicator of acid-base balance because urine is nor-mally acidic.
4. Venous blood measures tissue oxygen extraction accurately when used with arterial blood gases.
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