Blood when stored at 4degC can be kept for-: (A) 7 days, (B) 14 days, (C) 21 days, (D) 28 days
Answer is C. Typically, blood storage at 4 degrees C is sho term, which ranges from a few days to a few weeks. However, long-term storage usually involves blood being frozen, with a resultant loss in DNA yield. Refer robbins 9/e