This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemistry of Carbohydrates, Amino sugars, and Mucopolysaccharides, Subject name: Biochemistry
Anticoagulant used to estimate glucose from a sample sent from PHC is 
Select and explain. 
A. EDTA, B. Calcium oxalate, C. Potassium oxalate + NaF, D. Sodium citrate
C: Potassium oxalate + NaF
Answer: C: Potassium oxalate + NaF 
Explanation: Ans. is 'c' i.e. Potassium oxalate + NaF Repeat from Nov 06The standard anticoagulant used for collection of blood sample for glucose estimation is potassium oxalate.Sodium fluoride is used as a glycolytic inhibitor (At room temperature a loss of 1 to 2% of glucose per hour is expected in the collected blood sample as the RBCs in the sample are still alive and extracting glucose for glycolysis. This gives a false low value of blood glucose. Sodium fluoride is added to inhibit glycolysis)