If There Will Be an Unavoidable 4-Hour Delay Before a Serum

Multiple Choice

If there will be an unavoidable 4-hour delay before a serum sample can be tested,the sample should be:

A) kept at room temperature.
B) refrigerated between 2°C and 8°C.
C) frozen at -20°C.
D) discarded and a new sample collected when it can be tested immediately.