Final answer:
Sodium Fluoride and Potassium Oxalate are commonly found in gray color top tubes, which act as a preservative and anticoagulant for glucose and lactate testing in blood samples.
Step-by-step explanation:
The additives sodium fluoride and potassium oxalate are commonly found in gray color top tubes used for blood collection. These additives act as a preservative and anticoagulant, respectively, to maintain blood sample integrity for glucose and lactate testing. When mixed with blood, these substances inhibit glycolysis, which is the process where glucose is consumed by blood cells, thereby preserving glucose levels in the sample.