So the OP's question is how to access an element of a so-called macro array, using an index. Here is a way. HTH.   %let btype_1 = O+;   %let btype_2 = O-;   %let btype_3 = A+;   %let btype_4 = A-;   %let btype_5 = AB+;   %let btype_6 = AB-;   %let btype_7 = B+;   %let btype_8 = B-;     %macro btype(idx);     %if &idx < 1 or 8 < &idx %then %return;     %*;&&btype_&idx   %mend  btype;     %*-- check --*;   %put blood type 1 = %btype(1);   %put blood type 3 = %btype(3);   %*-- on log   blood type 1 = O+   blood type 3 = A+   --*; ... View more