The calculator first checks the non-scored high-risk pathways. If none applies, VTE risk score = sum of the selected point-scored risk factors.

Points	Risk factors
3	Single previous VTE provoked by surgery Caesarean hysterectomy
2	Current BMI ≥40 kg/m² Caesarean section in labour
1	First-degree family history of unprovoked or oestrogen-provoked VTE Age >35 years Parity ≥3 Smoking, any amount Gross varicose veins Current BMI 30–39 kg/m² IVF or ART in the first trimester Multiple pregnancy Pre-eclampsia in the current pregnancy Immobility Current systemic infection Pre-existing diabetes, excluding gestational diabetes Elective caesarean section Prolonged labour >24 hours Operative vaginal birth Preterm birth before 37+0 weeks Postpartum haemorrhage >1 L or transfusion Stillbirth in the current pregnancy

Select one BMI category and one caesarean category; categories within each pair are mutually exclusive. Postnatal score = antenatal risk factors still present plus postnatal risk factors.

Pathway	Implemented prompt
Therapeutic anticoagulation override	Continue or commence antenatal therapeutic anticoagulation and continue for 6 weeks postpartum; seek expert advice.
First-trimester high-risk override	Standard LMWH prophylaxis from the first trimester or assessment and continue for 6 weeks postpartum.
Thrombophilia override	Use the Queensland thrombophilia flowchart or seek experienced maternity-team advice.
Temporary inpatient-risk override	Standard LMWH prophylaxis while in hospital or until the risk resolves, then reassess.
Antenatal score ≥4	Standard LMWH prophylaxis from assessment.
Antenatal score 3	Standard LMWH prophylaxis from 28 weeks.
Postnatal score ≥3	Standard LMWH prophylaxis for 7 days, or longer if risk persists.
Postnatal score 2	Standard LMWH prophylaxis until discharge.

If standard prophylaxis is indicated and weight is entered, the calculator displays the Queensland enoxaparin dose reference.

Weight	Standard enoxaparin prophylaxis
≤50 kg	20 mg subcutaneously once daily
50–90 kg	40 mg subcutaneously once daily
91–130 kg	60 mg subcutaneously once daily
131–170 kg	80 mg subcutaneously once daily
≥171 kg	0.5 mg/kg/day subcutaneously; consider divided dosing for high BMI

Queensland Maternity VTE Risk Score