Yes, it is possible to do. Given item parameter estimates, you can do subject scoring (i.e., computing scores for subjects). Refer to Example 5 of PROC IRT documentation: Subject Scoring. ... View more

If you already have a fitted model, then you can use the INMODEL= option to specify a SAS data set that contains the model parameters. You can use the SCORE suboption to score new subjects without refitting the model.    You can also use the INMODEL= option to provide initial values for parameter estimates when fitting a model.  For details, see the documentation for the PROC IRT statement. ... View more