GFR

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The version of the eGFR calculator is useful to estimate the eGFR using a mobile phone. This can be installed in a java enabled mobile phone. This can be directly downloaded to the phone or can be first downloaded to the PC and then transferred to the phone. The serum Creatinine value, age should be entered and the gender, ethnicity should be selected using the phone’s key pad. The calculated eGFR value and the relevant CKD stage is displayed in a separate screen. Invalid data entries are captured and are alerted using a error message screen. The following sections provide the detailed description for the installation process and how to use the application. The look and feel of the application may depend on the mobile phone brand, screen shots of a Nokia 6230 is used in this page as examples.

1.0 Installation requirements

2.0 Instructions for installation

  2.1 Over the air installation with internet browser

  2.2 Manual installation using a PC connection

3.0 Instructions for use.

1.0 Installation requirements

  1. Java enabled mobile handset supporting CLDC 1.0 or 1.1 (Connected Limited Device Configuration) and MIDP 2.0 or 2.1 (Mobile Information Device Profile) versions. (See the note in the bottom to check the CLDC & MIDP versions available in your phone).
  2. Minimum of 16 KB of free memory in the handset.
  3. Your phone and the mobile network should support internet connection, preferably a GPRS connection
    or You should be able to transfer a file from your PC to the mobile phone using a USB cable or a wireless connection (Bluetooth, Infrared)

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2.0 Instructions for installation

The eGFR application can be directly downloaded from the PCEL website to your phone using OTA (Over the Air) installation facility or you can first download the application to a PC and then transfer it to the phone using a wired or wireless connection. Both installation methods are covered below.
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2.1 Over the air installation with internet browser

  1. Go to the option in your mobile phone which gives facilities to enter a URL. This could be listed as “Enter URL”, “Go to URL”, “Enter address” etc depending on the phone brand.
  2. Enter ‘www.clininf.eu/wrapped/gfr/pc_to_mobile.htm’ in the text box and press OK. (Figure 2).
  3. The phone will try to connect to the web address and will show you the download page. Two downloads links will be shown: “Download eGFR 1.1” and “Download eGFR 1.0”. Select the version that is supported by your device (See the note in the bottom to check the CLDC & MIDP versions available in your phone). If you are not sure, try downloading the eGFR 1.0. This should be supported by all of the java enabled phones. (Figure 3)
  4. You will be shown a description of the eGFR application. Please acknowledge the download by pressing ‘Accept’ or ‘OK’. The phone will connect to the PCEL server and the eGFR application will get downloaded to the handset. (Figure 4)
  5. You will be prompted to select a location to download. Select the ‘Application’ folder or an appropriate location and press OK.
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2.2 Manual installation using a PC connection

  1. In a PC with internet connection, go to the URL ‘www.clininf.eu/wrapped/gfr/pc_to_mobile.htm’ using the web browser.
  2. Click on the download link, select ‘Save target as’ and download the appropriate .zip file to your PC. Select either the file “eGFR11.zip” or “eGFR10.zip” based on the java version supported by your phone. (Please see the note in the bottom to check the CLDC & MIDP versions available in your phone).
  3. Uncompress the downloaded .zip file and you will get two files with the extensions .jad and .jar. (If you uncompress eGFR11.zip you will get eGFR_Midlet1.jad and eGFR_Midlet1.jar, from the eGFR10.zip you will get eGFR_Mobile.jad and eGFR_Mobile.jar)
  4. Connect the mobile phone to the PC using the USB cable or through a wireless connection e.g. Bluetooth, infrared. (Please refer to the user manual of your phone for information about PC connections)
  5. Transfer both the .jad and .jar files to your phone’s application folder or any similar folder recommended by the manufacturer.
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3.0 Instructions for use.

  1. Go to the mobile handset menu which shows the list of applications installed in your phone. Usually this should be under the “Applications” category.
  2. The calculator should appear in your phone’s list of applications as ‘eGFR_Mobile’. Select the item and launch the application. (Figure 5)
  3. The eGFR home page will be displayed with the St George’s Logo and the description about the calculator. (Figure 1)
  4. Two options can be selected. “New calculations” to calculate a new eGFR value (Figure 6) or “CKD stages” to display the five stages of CKD and their corresponding eGFR values. (Figure 7)
    Note: The screen layout and the way menu is presented would be slightly different according to the phone manufacturer. You may have to scroll down to view the full page depending on the screen resolution.
  5. If you select the “New calculation” option, an interface will be presented with two text boxes and two radio buttons.
  6. Highlight the first text box for serum Creatinine and enter the value in micro mol per litre (µmol/L). Valid range is 30µmol/L to 1500µmol/L.
  7. Highlight the second text box and enter the age of the patient in years. Valid range is 18 years to 110 years. (Figure 8)
    Important: Non numeric or out of range entries for Creatinine or age would give you an error message with the error description. (Figure 9) The message will disappear in 4 seconds.
  8. Highlight the appropriate radio button for gender using the navigation keys and select. Do the same for ethnicity. (Figure 10).
  9. Once the correct values are entered select “OK” from the menu. The results will be shown in a new page.
  10. In the results page, first the values entered for the calculations are displayed. Please verify that they are correct. In the bottom half of the page the eGFR value and the CKD status will be displayed. (Figure 11)
  11. Select “New calculation” if you wish to do another calculation, or select “Cancel” to go back to the home page.
  12. Select “Exit” option in the home page to close the application.
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Note : The MIDP and CLDC versions available in your phone should be listed in the user guide supplied with your phone or from the manufacturer’s website. Alternatively you can visit the site www.jbenchmark.com and select the name of your phone from the drop down list in the right hand site. CLDC and MIDP versions are given under the heading ‘JBenchmark 2.0 Java VM Details’. If your phone is having both MIDP 2.0 and CLDC 1.1 then use the eGFR 1.1 for any other CLDC/MIDP versions use the eGFR 1.0 version.

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