Which anticoagulant is commonly used in primary health care to collect blood samples for glucose testing?

Explanation

For blood glucose estimation, the preferred anticoagulant is the mixture of potassium oxalate and sodium fluoride. Potassium oxalate acts as an anticoagulant, while sodium fluoride inhibits glycolysis, preserving glucose levels in the sample. EDTA and heparin are not suitable for glucose testing as they do not prevent glycolysis effectively.