27th February 2024

A 67 year old male presents to his GP with a 2 day history of severe calf pain.

A 67 year old male presents to his GP with a 2 day history of severe calf pain. On examination, his right calf appears red and is warm and tender on palpation. His observations are stable with a BP 129/70, HR 90, Temp 36.8, O2 sats 97% on RA and RR 16. He has a background of colorectal cancer for which he received surgery a month ago and is currently undergoing chemotherapy. His regular medications include Omeprazole 20mg and Atorvastatin 10mg. A proximal leg ultrasound was requested but cannot be carried out within the next 4 hours.

Select the single, most appropriate first line management option.