Final answer:
The correct vacutainer for glucose testing is the grey top vacutainer, which contains additives to preserve glucose levels. In gastric function assessment, Diagnex blue is used to evaluate stomach acidity. The VDRL test for syphilis results in a flocculant.
Step-by-step explanation:
For testing glucose, the appropriate vacutainer to use is the grey top vacutainer. This type of vacutainer typically contains additives like potassium oxalate as an anticoagulant and sodium fluoride as a preservative and glycolysis inhibitor. The sodium fluoride helps to maintain glucose stability in the sample by inhibiting glycolysis, ensuring that the glucose levels measured are as accurate as possible at the time of sample collection. Therefore, the correct choice would be option B. grey.
Regarding the subject of gastric function assessment, it is carried out using Diagnex blue. The procedure involves a fasting state, the administration of caffeine sodium benzoate, followed by Diagnex blue granules, and comparing the color intensity of the urine sample to determine the presence of free HCl in the stomach. This test can provide information about conditions such as hypochlorhydria or achlorhydria.
The VDRL test, which is used for diagnostic purposes in syphilis, results in the formation of a flocculant, which is choice a. flocculant.