In which tube would you collect blood for testing lactic acid?

The correct tube for collecting blood for testing lactic acid is the light green tube. This tube typically contains lithium heparin as an anticoagulant, which is appropriate for a variety of tests, including lactic acid measurement. The use of lithium heparin helps to prevent clotting while preserving the metabolic state of the analyte, ensuring accurate results.

Lactic acid testing requires that the sample is processed quickly to avoid false elevation due to continued metabolic activity after the sample is drawn. The light green tube is designed to meet this need, providing a reliable environment for the collection and transportation of the sample. Other tubes listed, such as those with citrate (light blue), EDTA (royal blue), or separator gel (tiger), are not suitable for lactic acid testing as they may alter the results or lead to inaccurate measurements.