Profiling Neutrophil Counts in Patients on Chemotherapy

Inclusion Criteria: * Solid tumour diagnosis. * Adults ≥ 18 years. * Receiving either single agent or combination cytotoxic chemotherapy alone or in combination with other targeted or immunotherapies. * Participants can be receiving primary prophylactic antibiotics or GCSF. * Live within boundaries of Local Care Direct service provision. Exclusion Criteria: * Inability to give informed consent. * Concurrent haematological malignancy. * Known bleeding disorder. * Known sickle cell disease or β-thalassaemia major. * Known poorly controlled anti-coagulation (INR \>3.5 within 6 months for those on warfarin).