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Medicine
A second-year PG resident tells you to perform an ABG of a patient. All of the following are true about performing an ABG except:
Before performing the ABG, syringe should be loaded with 0.3 cc of heparin
Normal pH, HCO. and PCO, levels may not indicate absence of an acid-base imbalance
A different site should be tried i f modified Allen's test is negative
Radial aery is the preferred site
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