This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anaesthesia
Heparin interferes with which of the following results of ABG 
Select and explain. 
A. PO2, B. PCO2, C. ph, D. All
C: ph
Answer: C: ph 
Explanation: C i.e. pH Heparin is strongest organic acid present in body, so it can decrease pH.