The best replacement for agglutination is precipitation.

The best alternatives to agglutination are rated as following:
★★★★★  precipitation
★★★★  coagulation
★★★  clotting
★  aggregation
★  rouleaux
★  opsonization
★  polysynthetic
★  clumping
★  indirect agglutination
  hemolysis
  precipitation reactions

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Speaking about agglutination, one probably shouldn't forget about blood type.

Other search terms related to agglutination and their ratings are:
★★★★★ blood type
blood typing
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agglutination
precipitation
coagulation