Red flags that mean ER, not a house call
A home GP carries a stethoscope, a pulse oximeter and clinical judgement. What the doctor does not carry is an operating theatre, a CT scanner, a defibrillator crash team or a blood bank. The whole discipline of using home visits well is knowing which problems fit inside that limitation. For anything on the list below, call 998 for an ambulance or go straight to the nearest emergency department; do not wait one to three hours for a house call.
Everything below that threshold, the classic home-visit workload, is fair game: fever and flu, throat and ear infections, gastro and food poisoning, urinary symptoms, migraine, mild asthma flare-ups in a known asthmatic, back pain, rashes, travel-related illness, and chronic-condition check-ins for patients who cannot easily leave the house. The visiting doctor's first job on arrival is to re-verify that the case still belongs at home, and a competent one will redirect you to hospital mid-visit if the picture has changed.