If you went in for a blood test in the morning, and they phoned you later the same day to ask you to come in tomorrow, does that automatically mean something bad?
DH went in for a blood test this morning - he has some symptoms which suggest overactive thyroid. He says they took samples to test his thyroid, liver and blood sugar, and gave him an appointment to come back on the 9th of Jan to discuss results - but they just phoned him and said they had his results back, and could he come in tomorrow? Would they do that for an overactive thyroid? Or is there something else going on?