I've worked in several different pediatric hem/onc/HSCT institutions. Everywhere I've worked, when a patient is diagnosed inpatient they have some sort of connection with the clinic prior to being discharged as part of their discharge criteria. Most institutions I've worked for, the patient and family will get a tour of the clinic prior to discharge. Otherwise the clinic nurse who will be the primary for the patient has come inpatient to do some teaching and explain the clinic process.The rest of your questions sound like it might be a difference between the pediatric and adult world. Everywhere I have worked the attendings work both inpatient and outpatient. There is a lot of fluidity, good communication, and usually we don't have issues. Patients who are newly diagosed usually have a clinic appointment the day following discharge or just a few days later. If they would need urgent help before their first scheduled clinic appointment it would be handled like an established patient.As for how the primary attending gets assigned I've seen a lot of variation. Sometimes it's the attending who diagnosed the patient. Sometimes it's whoever has the fewest patients on their current panel. Sometimes it's family request. Sometimes it's attending request. Sometimes it's based on when their inpatient treatment was given, when it's due next, and whose clinic day that is.