Dialysis Dose Kt/V Calculator (Daugirdas 2nd Gen.)

Dialysis Dose Kt/V Calculator (Daugirdas 2nd Gen.) | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Health
Input types: number
Output type: json
Sample coverage: 4
API ready: Yes

Overview

Estimate single-pool Kt/V (spKt/V) for an intermittent hemodialysis session using the Daugirdas second-generation formula. Enter pre- and post-dialysis BUN, treatment time, ultrafiltration volume, and post-dialysis weight to receive the Kt/V value, BUN ratio, and a status against the 1.2 minimum reference.

When to use

Estimate delivered dialysis dose for a conventional intermittent hemodialysis session.
Review how BUN reduction, treatment time, ultrafiltration, and post-dialysis weight affect spKt/V.
Check whether a calculated session reaches the KDOQI minimum reference of 1.2.

How it works

1Enter positive pre-dialysis and post-dialysis BUN values, with post-dialysis BUN lower than pre-dialysis BUN.
2Enter treatment time in hours, ultrafiltration volume in kilograms, and post-dialysis weight in kilograms.
3The calculator computes R as post-dialysis BUN divided by pre-dialysis BUN and applies the Daugirdas second-generation formula.
4The JSON result includes Kt/V, ratio R, status, method, and a note about the 1.2 minimum reference.

Use cases

Nephrology teams can estimate the delivered spKt/V for individual hemodialysis sessions.
Dialysis educators can demonstrate the relationship between BUN values, treatment time, ultrafiltration, and post-dialysis weight.
Clinical reviewers can compare calculated results with the KDOQI minimum reference and target range.

Examples

1. Four-hour session reaching the minimum reference

Dialysis clinician

Background

A hemodialysis session has a pre-dialysis BUN of 90 mg/dL and a post-dialysis BUN of 30 mg/dL.

Problem

Estimate the delivered single-pool Kt/V and determine whether it reaches the 1.2 minimum reference.

How to use

Enter preBun 90, postBun 30, treatmentTime 4, ultrafiltration 2, postWeight 70, and decimalPlaces 4.

{"preBun":90,"postBun":30,"treatmentTime":4,"ultrafiltration":2,"postWeight":70,"decimalPlaces":4}

Outcome

The calculator returns Kt/V = 1.2805, with R = 0.3333 and status indicating that the 1.2 minimum is met.

2. Shorter session with higher ultrafiltration

Dialysis educator

Background

A session uses a pre-dialysis BUN of 100 mg/dL, a post-dialysis BUN of 35 mg/dL, 3.5 hours of treatment, and 3 kg of ultrafiltration.

Problem

Calculate spKt/V while accounting for the post-dialysis weight of 80 kg.

How to use

Enter preBun 100, postBun 35, treatmentTime 3.5, ultrafiltration 3, postWeight 80, and decimalPlaces 4.

FAQ

What does this calculator estimate?

It estimates single-pool Kt/V (spKt/V) for an intermittent hemodialysis session.

Which formula does it use?

It uses the Daugirdas second-generation formula: −ln(R − 0.008·t) + (4 − 3.5·R)·UF/W.

What inputs are required?

Pre- and post-dialysis BUN, treatment time, ultrafiltration volume, and post-dialysis weight are required.

How should post-dialysis BUN be collected?

Use a slow-flow or stop-pump collection technique, as specified in the tool description.

Does this calculator apply to peritoneal dialysis or CRRT?

No. It is intended for intermittent hemodialysis and not for peritoneal dialysis, CRRT, or SLED.

{"preBun":100,"postBun":35,"treatmentTime":3.5,"ultrafiltration":3,"postWeight":80,"decimalPlaces":4}

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Four-hour session reaching the minimum reference

2. Shorter session with higher ultrafiltration

FAQ

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