Because of an Extremely Low PO₂, You Suspect That an Arterial

Because of an extremely low PO₂, you suspect that an arterial blood sample taken from a patient's brachial artery might have been contaminated with venous blood. Which of the following might help to confirm your suspicion?

A) Call the lab to get the latest chemistry report.
B) Inspect the sample for color and consistency.
C) Cross-check the sample with an SpO₂ reading.
D) Measure the sample's actual hemoglobin saturation.