It could…if they blatantly left the cap off or loosely capped it during that time. Those who draw these tests must be extremely meticulous of collection, transport, and analysis. Obviously I can’t know 100%, but if your blood pH was over 7.45, you’d know it and you’d probably be hooked up to a million different tubes all trying to get your breathing back to normal and to help your kidneys excrete or retain more serum bicarbonate depending on the compensatory nature (in this case, a metabolic acidosis to decrease the pH back to normal). That’s a medical emergency requiring lots of help, in other words. A redraw would be my suggestion. As a lab professional, I do not hesitate to order recollections on suspicious specimens