Does mrsa not isolated mean the pt does have mrsa?

No. "MRSA not isolated" means that MRSA was not found in the culture of the specimen that was tested. This means that the patient either does not have MRSA, or that the infection is caused by a strain of MRSA that is not detectable by the culture method that was used. A negative culture result does not necessarily mean that a patient does not have MRSA, it is always best to consult with a healthcare professional for an accurate diagnosis.