IF NOT EXISTS (SELECT * FROM SYSCOLUMNS INNER JOIN SYSOBJECTS ON SYSOBJECTS.id = SYSCOLUMNS.id 
              WHERE SYSCOLUMNS.NAME = 'SPO2' AND SYSOBJECTS.name = 'HYIZLEMTRANSFUZYON')
ALTER TABLE dbo.[HYIZLEMTRANSFUZYON] ADD SPO2 NVARCHAR(10) NULL
go