The tap tube used for fsh (fisheries science and habitat) is typically colored blue. This blue color helps differentiate it from other tubes used for different purposes in laboratory or field settings. Always check specific guidelines or standards in your area, as color codes may vary.
serum,tiger tube
I would use the semi-colored tube.
green
a lavender top tube
red
red
blue
Light blue
tiger top
gray
SST
The recommended color tube for rubella serology testing is a red or tiger-top tube with gel separator. This allows for serum separation, which is needed for the test.