In which tube top would you find the additive sodium heparin?

The additive sodium heparin is found in the light brown tube top. This is specifically designed for plasma separation and is used primarily for tests requiring plasma specimens. Sodium heparin functions as an anticoagulant, preventing blood from clotting, which is essential for certain laboratory analyses that necessitate the evaluation of plasma rather than serum.

When collecting blood samples, the choice of tube and its respective additive is crucial, as it can significantly affect the results of the tests conducted on those samples. The other tube tops have different additives or purposes, making them unsuitable for collecting samples intended for tests that require the anticoagulant action of sodium heparin.