Table 1

Examples of inappropriate requesting

Cause of inappropriate requestExample
Wrong patient (or patient is unsuitable)– Prostate Specific Antigen (PSA) as a tumour marker in females – carbohydrate antigen 19.9 (CA19.9) as a tumour marker in children (generally)
Wrong test– Factor V Leiden genetics on a patient with a normal activated protein C test
Wrong time– Glycosylated haemoglobin (HbA1c) 1 week after the previous test – Digoxin 1 h postdose (in cases of monitoring) – Any repeat haemochromatosis genetic test
Wrong process– Potassium on Ethylene diamine tetraacetic acid (EDTA) sample – Unlabelled sample – Renin/aldosterone in patients on some types of diuretic