RadioGroup1.ItemIndex

[marcoszorrilla]

Código Delphi [-]
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ExtCtrls;

  
type
  TForm1 = class(TForm)
    RadioGroup1: TRadioGroup;
    Button1: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure ConsultaNumeroOrden;
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
begin
ConsultaNumeroOrden;
end;

Procedure Tform1.ConsultaNumeroOrden; //este es un procedimiento
begin
   Label1.Caption := IntToStr(RadioGroup1.ItemIndex);
end;

end

Comprobado que así te va a funcionar.

Un Saludo.