General Medicine & Vital Signs

HOSPITAL Score Calculator – 30-Day Unplanned Hospital Readmission Risk

Clinical calculation support · Verify results before clinical use

30-Day Readmission Risk Assessment

Enter the patient's discharge and admission characteristics.

—Score / 13

Discharge hemoglobin

Most recent hemoglobin concentration at discharge.

1 point if <12 g/dL

Hemoglobin (g/dL)

Enter a value from 0 to 30 g/dL.

Oncology service

Was the patient discharged from an oncology service?

2 points if yes

No0 points

Yes+2 points

Discharge serum sodium

Most recent serum sodium concentration at discharge.

1 point if <135 mmol/L

Serum sodium (mmol/L)

Enter a value from 80 to 200 mmol/L.

Procedure during index hospitalization

Was at least one procedure performed during the index admission?

1 point if yes

No0 points

Yes+1 point

Urgent / emergency admission

Was the index hospitalization an urgent or emergency admission?

1 point if yes

No0 points

Yes+1 point

Hospital admissions in the previous 12 months

Count prior hospital admissions during the 12 months before the index admission.

0, 2, or 5 points

0–1 admissions0 points

2–5 admissions+2 points

>5 admissions+5 points

Length of stay

Total length of the index hospital stay.

2 points if ≥5 days

Length of stay (days)

Enter completed hospital days as a whole number (0 or more).

—HOSPITAL

Complete all fields to calculate

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Seven variables are required.

Clinical interpretation The score estimates risk of potentially avoidable 30-day readmission in the population for which it was developed. It does not replace clinical assessment.

The displayed risk percentages are observed rates in the international validation cohort, not individualized or universally calibrated probabilities.

About the HOSPITAL Score

The HOSPITAL score is a clinical prediction model designed to identify adult medical patients at risk of potentially avoidable 30-day readmission after hospital discharge. The acronym represents Hemoglobin, Oncology, Sodium, Procedure, Index admission type, number of prior Admissions, and Length of stay.

The score was derived and subsequently validated in hospitalized medical patients. Its use should remain aligned with the population and outcome definitions of the original studies.

Variables and scoring

Variable	Criterion	Points
Hemoglobin	<12 g/dL at discharge	1
Oncology	Discharge from oncology service	2
Sodium	<135 mmol/L at discharge	1
Procedure	Procedure during index stay	1
Index admission	Urgent / emergency	1
Prior admissions	0–1 / 2–5 / >5 in previous 12 months	0 / 2 / 5
Length of stay	≥5 days	2

Risk groups

Total score	Risk group	Observed readmission rate
0–4	Low	5.8%
5–6	Intermediate	11.9%
≥7	High	22.8%

Important methodological note

The international validation publication used prior admissions categories of 0–1, 2–5, and more than 5. This calculator uses that validated categorization. The derivation and validation publications should be consulted for details of cohort selection, outcome definition, and model performance.

References

Donzé J, Aujesky D, Williams D, Schnipper JL. Potentially Avoidable 30-Day Hospital Readmissions in Medical Patients: Derivation and Validation of a Prediction Model. JAMA Internal Medicine. 2013;173(8):632–638.
doi:10.1001/jamainternmed.2013.3023

Donzé JD, Williams MV, Robinson EJ, et al. International Validity of the HOSPITAL Score to Predict 30-Day Potentially Avoidable Hospital Readmissions. JAMA Internal Medicine. 2016;176(4):496–502.
doi:10.1001/jamainternmed.2015.8462

Scope and limitations

Designed for adult medical patients, not as a universal score for all inpatient populations.
Predicts potentially avoidable readmission as defined in the source studies; this is not identical to every unplanned readmission.
Observed risk rates may differ across hospitals, health systems, and patient populations.
Use alongside clinical judgement and local readmission-prevention pathways.

Clinical disclaimer: This calculator is intended for educational and clinical decision-support purposes. It is not a substitute for comprehensive clinical assessment, discharge planning, or local protocols. Do not use the score alone to determine eligibility for discharge or the intensity of post-discharge care.