1+ reaction has numerous small clumps and cloudy red supernatant
2+ has many medium-sized clumps and clear supernatant.
3+ has several large clumps and clear supernatant
4+ has one solid clump, no free cells, and clear supernatant
BB
Tube-based agglutination reactions in blood bank are graded from negative (0) to 4+. A reaction that has numerous small clumps in a cloudy, red background is:
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