Objective: The completeness of ED medical record documentation is often suboptimal. We aimed to determine the variables associated with documentation completeness in a large, tertiary referral ED. Methods: We audited 1200 randomly selected medical records of patients who presented with either abdominal pain, cardiac chest pain, shortness of breath or headache between May-July 2013 and May-July 2016. Data were collected on patient and treating doctor variables. Documentation completeness was assessed using a 0-10 point scoring tool designed for the study. A maximum score was achieved if each of 10 pre-determined important items, specific to the presenting complaint, were documented (five medical history items, five physical examination items). Data were analysed using multivariate regression. Results: The presenting year, day and time, patient age and gender, preferred language, interpreter requirement, discharge destination and doctor gender were not associated with documentation completeness (P > 0.05). Patients with triage category 3 or pain score of 6-7 had higher documentation scores (P < 0.05). Compared to interns, registrars (effect size −0.72, 95% CI −1.02 to −0.42, P < 0.01) and consultants (−1.62, 95% CI −1.95 to −1.29, P < 0.01) scored significantly less. The headache patient subgroup scored significantly less than the other patient subgroups (−0.35, 95% CI −0.63 to −0.08, P = 0.01). For all presenting complaint subgroups, examination findings were less well documented than history items (P < 0.001). Conclusion: Documentation completeness is less among senior doctors, headache patients and for examination findings. Research should determine if the supervision responsibilities of senior doctors affects documentation and if medicolegal and patient care implications exist.Associated symptoms 130 (93.3) Eye exam 23 (7.7) †n = number of times an item was documented out of a maximum of 300 for each presenting complaint in 300 patients.