What type of test requires a warm sample collection?

The cold agglutinins test requires a warm sample collection because cold agglutinins are antibodies that can cause red blood cells to clump together at lower temperatures. When blood samples are collected for this test, they must be maintained at body temperature during the collection and processing stages to prevent these antibodies from causing interference in the test results.

If the sample gets too cold, the agglutinins may cause the cells to aggregate, which could lead to inaccurate results. Therefore, it’s crucial to handle the samples properly by warming them to a suitable temperature immediately after collection. The other tests listed do not require such specific temperature conditions, as they are not affected significantly by the temperature of the sample after collection.