[Histonet] using patient blocks for positive IHC controls

[Cathy Boyd]

Does anyone know if there are  any regulations on how much tissue you can cut from a patient block?  We currently use known positive patient slides for our IHC positive control slides?  One of our pathologist questioned if we could use an entire patient block ,cutting through the block for controls as long as the slide was still positive.  Or is this an individual institution decision?  She was especially concerned about CAP.