Anti-I is most commonly detected in which crossmatch phase?

Anti-I is most commonly detected in which crossmatch phase?

• A. room temperature
• B. 37°C
• C. Immediate spin
• D. AHG phase

Answer: (A)

Anti-I is a cold-reactive antibody. Cold agglutinins like anti-I react best at lower temperatures, notably around room temperature. In crossmatching, the immediate spin phase is performed at room temperature with saline, so this is when anti-I most readily causes agglutination and is detected. At warmer temperatures (37°C) or in the antiglobulin (AHG) phase, cold IgM antibodies such as anti-I typically do not produce a strong reaction, so they are not as likely to be detected there. Therefore, room temperature is the phase where anti-I is most commonly observed.

Anti-I is a cold-reactive antibody. Cold agglutinins like anti-I react best at lower temperatures, notably around room temperature. In crossmatching, the immediate spin phase is performed at room temperature with saline, so this is when anti-I most readily causes agglutination and is detected. At warmer temperatures (37°C) or in the antiglobulin (AHG) phase, cold IgM antibodies such as anti-I typically do not produce a strong reaction, so they are not as likely to be detected there. Therefore, room temperature is the phase where anti-I is most commonly observed.