Which chemistry analyte is associated with sodium citrate in non-serum tubes?

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Multiple Choice

Which chemistry analyte is associated with sodium citrate in non-serum tubes?

Sodium citrate acts as an anticoagulant by binding calcium, so it’s used in non-serum tubes to obtain plasma instead of serum. In this question’s pairing, the chemistry analyte associated with citrate in non-serum tubes is CARB, meaning carbohydrate testing is depicted as being done on citrate-plasma. This reflects the idea that some tests are performed on plasma rather than serum because of the anticoagulant’s presence. The other additives shown align with different tests or specimen types (fluoride/oxalate for glycolysis-related glucose workups, EDTA for tests requiring a strong calcium chelator, and HCG typically measured in serum/plasma with other anticoagulants).

Sodium citrate acts as an anticoagulant by binding calcium, so it’s used in non-serum tubes to obtain plasma instead of serum. In this question’s pairing, the chemistry analyte associated with citrate in non-serum tubes is CARB, meaning carbohydrate testing is depicted as being done on citrate-plasma. This reflects the idea that some tests are performed on plasma rather than serum because of the anticoagulant’s presence. The other additives shown align with different tests or specimen types (fluoride/oxalate for glycolysis-related glucose workups, EDTA for tests requiring a strong calcium chelator, and HCG typically measured in serum/plasma with other anticoagulants).

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