Final answer:
The test that can be collected after drawing blood into a gray tube containing sodium fluoride/potassium oxalate is Blood glucose. This tube contains an antiglycolytic agent suitable for glucose preservation. The answer is option 1.
Step-by-step explanation:
The gray tube with sodium fluoride/potassium oxalate is used specifically for glucose preservation, as it contains an antiglycolytic agent that inhibits the breakdown of glucose by cells.
From the options provided, the test that can be collected after drawing blood into a gray tube is Blood glucose (1). This is because sodium fluoride preserves glucose by inhibiting glycolysis. Therefore, after drawing blood into a gray tube, you can indeed measure blood glucose levels.
For the Complete blood count (2), a lavender or purple top tube, which contains EDTA as an anticoagulant, is typically used. For Serum electrolytes (3) and Liver function tests (4), a serum separator tube (SST) or a green top tube containing heparin is commonly utilized. Neither of these tests would be appropriate after a draw from a gray sodium fluoride/potassium oxalate tube since they require different tube types for accurate measurements.