Letter to Cancel an Appointment to gather more Information

1. I [name] had booked an appointment with you for [date] at [time]. I had gone to Dr. [name] with a complaint of frequent headaches. He recommended monitoring my Blood Pressure. I monitored it for one month but it was never more than 120 mmHg systolic or less than 70 mmHg diastolic. So he recommended that I get some blood tests done namely, CBC, LFTs, RFTs, and thyroid tests. He...