GFR

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The desktop version can be used for a single calculation of eFGR value based on Creatinine value, age, gender and ethnicity without the need of an internet connection. This application can be downloaded easily even through a slow speed dialup internet connection or can be easily transferred between computers using a diskette, USB memory stick or as an email attachment. This Visual Basic application can be saved in an appropriate location on a PC/laptop and launched quickly when needed for a calculation. In situations where UK (µmol/L) standard units are not available, user can use the facility to convert from the US (mg/dL) units. Non-numeric and out of range values are captured and prompted with specific details about the error.

1.0 Installation requirements

2.0 Instructions for installation

3.0 Instructions for use

1.0 Installation requirements

  1. Live internet connection to download the eGFR Desktop calculator (File size 32 KB) or

    The pre-downloaded calculator can also be transferred to the destination computer using a physical media (e.g. Floppy diskette, Flash Drive) or using an electronic media (e.g. as an attachment to an email).

  2. A Desktop or Laptop PC running Windows 98, WinMe, 2000, or XP and newer. The desktop version of the eGFR calculator runs as a off-line standalone application; therefore no internet connection is required.
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2.0 Instruction for Installation

  1. Visit the ‘CKD resources’ web page of the Clinical Informatics Website (www.clininf.eu/ckd). This has a list of all the calculators designed to calculate the eGFR listed under the ‘Calculators’ heading.
  2. Click on the ‘Desktop eGFR calculator’ link. This will give a file download dialog box (Figure 1). Click on ‘Save’ button and select an appropriate location to save the eGFR calculator (e.g. Desktop My Documents etc).

    Figure 1

  3. The eGFR calculator will start to download and message box shown in figure 2 will appear informing the completion of the download. Press the ‘Close’ button and close the message box.

    Figure 2

  4. The eGFR desktop calculator’s icon with the name ‘eGFR.exe’ will appear in the location where you selected to save the application in step 3 (Figure 3).

    Figure 3

3.0 Instructions for use

  1. Execute the eGFR calculator by double clicking on the icon shown in figure 3. This will launch the calculator window as shown in figure 4. If security warning message is given mentioning that the publisher can not be verified, ignore it and press ‘Run’.

    Figure 4

  2. Enter the serum Creatinine value of the patient in micro moles per litre (µmol/L) to the first text box. If you have the serum Creatinine value in milligrams per decilitres ( mg/dL), click on the check box in the bottom left hand side and enable the facility to convert from mg/dL to µmol/L. This will enable the text box in the in the bottom next to the ‘Convert’ button. Enter the Creatinine value in mg/dL to the text box and press ‘Convert’, the value will get converted to the standard UK unit (µmol/L) and automatically get inserted to the first text box (Figure 5).

    Figure 5

  3. Enter the patient’s age in years to the second text box.
  4. Select the patient’s gender and ethnicity using the two groups of radio buttons.
  5. Once all the necessary fields are specified in the form, click on the ‘Calculate’ button. This will give you the calculated eGFR value in the eGFR text box (Figure 4).
  6. The valid values for serum Creatinine is a numeric between 30µmol/L and 1500µmol/L. Pressing the ‘Calculate’ button after entering an invalid Creatinine value will trigger an alert message (Figure 6).


    Figure 6

  7. The valid value for age is a numeric between 18 years and 110 years. Pressing the ‘Calculate’ button after entering an invalid age value will trigger an alert message (Figure 7).


    Figure 7

  8. Pressing the ‘OK’ button on the alert message will erase only the invalid values entered to the text boxes and prepares the form to accept new values for a calculation.
  9. Use the set of links in the ‘CKD links page’ (www.clininf.eu/ckd) to obtain more specific information about the CKD guidelines and other related resources.
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