# Use a clinical calculator with the source in view

Check the formula, intended population and units before interpreting a score.

Canonical URL: https://attendme.ai/guides/use-a-clinical-calculator

Availability: live. Content review: editorial; Automated source and product-fact consistency checks; 2026-10-14.

## Choose the relevant tool

Find a calculator by specialty or name. Confirm that it addresses the question you have.

## Inspect the original reference

Check the intended population, outcome and time horizon. Read the limitations alongside the formula.

## Check inputs and units

Use the tool's required units and valid ranges. Missing information should remain missing rather than guessed.

## Review its limits

A score supports interpretation within its intended setting. Consult the relevant source and local guidance before applying it.

## A worked workflow example

Inspect eGFR (CKD-EPI 2021) with fictional teaching inputs. Check its units, references and result structure. This exercise does not assess a patient or provide a treatment decision.

### Your input

Use a fictional teaching record: age 55 years, sex female and creatinine 1.0 mg/dL. These values identify no person. Use the form's requested units. Do not paste a value in µmol/L into a field labelled mg/dL.

### In AttendMe

Open Clinical Calculators and search eGFR. Open eGFR (CKD-EPI 2021). Read References and Interpretation. Enter the fictional values in the Calculate panel, then select Calculate. Leave an unknown required input unresolved; this exercise supplies values only to demonstrate the interface.

### What you inspect

Check the displayed value, unit, interpretation and warnings in Result. Verify the equation and intended use against the original reference. Confirm that this is CKD-EPI 2021, rather than another renal function tool. This guide provides no expected clinical category or treatment instruction.

### Your reviewed result

Example teaching record: 'Tool: eGFR (CKD-EPI 2021). Inputs: fictional age, sex and creatinine with units. Result: copy the actual value and unit. Reference: inspect the cited source. Limit: record the stated applicability limits.' The result is an inspectable calculation, not an individual management plan.

## Before you reuse the result

Use this final check to decide whether the work is ready to discuss, save or continue. A useful output preserves its evidence, its scope and the questions it could not answer.

- The tool name and equation version match the intended exercise.

- Each fictional input uses the required unit and definition.

- The recorded result includes its unit and stated limitations.

- You inspected the original reference before interpreting the calculation.

Continue: https://attendme.ai/auth/signup?intent=calculators