K-BIT Calculator

Pre-biopsy Clinical Risk Score for Major Bleeding After Kidney Biopsy

The K-BIT score uses pre-biopsy clinical information to stratify patients according to major bleeding risk after kidney biopsy.

Age (years)

Pre-biopsy diagnosis

Diagnoses are listed alphabetically. Select a diagnosis, then use “ICD-10 codes” to view its definition.

Height and weight

Metric (cm, kg) US / Imperial (ft, in, lb)

Height (cm)

Weight (kg)

BMI is calculated automatically from height and weight.

Charlson Comorbidity Index (CCI)

CCI = 0

CCI ≥ 1

K-BIT score

Score breakdown

Very-Low (0–2)
Current-practice-equivalent (3)
Moderate-to-High (4–9)

Current-practice-equivalent (Score 3): In the simulation, discharge of patients with a K-BIT score of 3 was associated with a major bleeding risk approximately equivalent to that under current practice.

View scoring criteria

Variable	Category	Points
Age	18–49 years	0
	50–69 years	1
	≥70 years	3
Pre-biopsy diagnosis	Chronic glomerulonephritis / Proteinuria / Nephrotic Syndrome	0
	IgA Vasculitis	1
	Interstitial Nephritis / Other kidney diseases / Other collagen diseases	2
	RPGN / AAV / SLE / MM, MGUS / Amyloidosis / Acute Kidney Injury	3
BMI	≥22 kg/m²	0
	18.5–<22 kg/m²	1
	<18.5 kg/m²	2
CCI	0	0
CCI	≥1	1

K-BIT score categories: Very-Low (0–2), Current-practice-equivalent (3), and Moderate-to-High (4–9). These categories are displayed as score categories and should be interpreted according to the accompanying study/report.