Which laboratory test would be most appropriate for a Light Green tube?

The Light Green tube is primarily used for specific tests that require plasma, as it contains sodium heparin as an anticoagulant. This tube is particularly suited for tests that measure substances in the plasma rather than whole blood. Among the options provided, the most appropriate test for a Light Green tube is hCG quantitative, which measures the concentration of human chorionic gonadotropin in the plasma. This test is essential in pregnancy testing and monitoring conditions related to pregnancy. The quantitative test requires a liquid sample for accurate measurement, making the Light Green tube an optimal choice.

Blood type determination generally requires specific tubes that preserve cellular components or may utilize serum, which are incompatible with the anticoagulant properties of the Light Green tube. Ammonia level testing typically requires a different vacuum tube, usually a sterile tube, due to the sample's sensitivity to ammonia levels and the necessity for prompt analysis. A Complete Blood Count (CBC) is performed using lavender or purple-top tubes that contain EDTA, which is specifically designed for such tests to assess blood cell components accurately.