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A Small Revolution in Diabetes Management

Does RapidCalc work with iOS 8?

Yes, RapidCalc works perfectly under iOS 8. As a sensible precaution against data loss, you should always backup your RapidCalc settings and history data before upgrading your device.

Will there be an Android version and if so, when?

We recognise a demand for an Android version, but with limited resources we are currently focused on developing the iPhone version. We have no immediate plans for an Android version.

Why can't I edit history records or enter a backdated bolus record?

People are often surprised that RapidCalc does not allow you to edit historic records or enter a bolus record for a earlier time. The reason is that each dose calculation relies on earlier records to determine insulin-on-board which is then included along with the dose calculation as an audit trail. Changing an historic bolus record or inserting a new one out of sequence would break the audit trail. We consider patient safety and calculation transparency to be of primary importance and so we only allow you to delete bolus records starting with the most recent. To gain maximum benefit from RapidCalc you should be entering your data as and when it happens so that, in normal use, correcting an error should require only a single record to be deleted and re-entered.

Can I run RapidCalc on my ipod touch?

RapidCalc works well on the ipod touch, in fact many parents prefer it for their children as it's cheaper and less likely to be pinched at school! A second-hand ipod is perfect if money is tight, or you want something you can leave in your kit bag. Note that on early models without a camera you won't have the option to take a photo of your meal.

Why do I have to enter all those settings before I can use the calculator?

Everybody is different and to be effective RapidCalc needs your personal settings. Remember the calculator will be managing a lot of routine details for you from now on and by entering them once, you won't have to think about them again.

I'm not sure what values to use for some of the personal settings, are there standard values I can use?

Unfortunately not. Everyone is different and this will be reflected in your personal settings. You should discuss your use of RapidCalc with your doctor or diabetes educator who can help you determine your personal settings. Don't be tempted to use 'standard' values, at best you will not see any real benefit from using RapidCalc and at worst you could be putting your health at risk.

I find it difficult to select my precise blood glucose reading using the slider, when I lift off my finger the value jumps.

To make small adjustments to your values simply tap near the plus or minus symbols at either end of the slider rail. This slide-n-tap technique works with all the sliders and makes data entry much quicker and easier than entering numbers via a keypad.

Can I use RapidCalc to work out how much carbohydrate I need to eat to treat a hypo?

You can use RapidCalc to estimate the amount of carbohydrate needed to restore a low blood glucose level as follows:

  • Enter your current (low) BGL reading using the 'Measured Blood Glucose' slider.
  • Make small incremental adjustments to the 'Planned Carbohydrate Intake' by tapping on the slider until the 'Suggested Dose RAI' value just goes above zero.
  • Read the 'Planned Carbohydrate Intake' value. This will be the amount of carbohydrate needed to bring your blood glucose level back up to your current target level allowing for any insulin remaining to act.

Sometimes, before going to bed, my blood glucose is on target, but RapidCalc shows that I have insulin still remaining to act. Can I use RapidCalc to help me establish a safe blood glucose level so I don't go too low overnight?

You can use RapidCalc to estimate how much carbohydrate to take to offset the insulin remaining to act as follows:

  • Enter your current (on-target) BGL reading using the 'Measured Blood Glucose' slider.
  • Make small incremental adjustments to the 'Planned Carbohydrate Intake' by tapping on the slider until the 'Suggested Dose RAI' value just goes above zero.
  • Read the 'Planned Carbohydrate Intake' value. This will be the amount of carbohydrate needed to offset the insulin remaining to act and so maintain your target blood glucose level.

What happens if I forget to enter my data into RapidCalc or don't have it with me when I dose or eat?

For safety and accuracy it is important that your data is recorded at the time, but to allow for this situation RapidCalc lets you enter a 'back-dated' record as follows:

  • Enter your missed blood glucose reading and carb intake into RapidCalc as normal.
  • When you come to save the record, adjust the 'Actual Dose taken' slider to match your actual dose.
  • From the Save Record screen, touch the clock symbol button in the blue title bar and adjust the record time to the match the time you dosed. You can back-date a record to any time after your last record.
  • Press 'Confirm' to accept the new time and return to the Save Record screen.
  • Add a note if appropriate and press 'Confirm' to the save the record as normal.
  • The new record should now appear in your history data at the correct time and with the IOB correctly adjusted for the dose time.

I can't always test my blood glucose level before a meal, can I still use RapidCalc to calculate a dose?

In this situation it is safest to assume that your blood glucose is on-target and just dose for your planned carbohydrate intake. By ticking the 'Blood Glucose not measured' option RapidCalc will do exactly that. It will assume that your BGL is on-target and will ignore any Insulin-On-Board when calculating the suggested RAI dose. The record will be flagged as an estimate in your history records.

What if I make a mistake entering a record or forget to add a note?

You can add or edit notes for any history record at any time, but you can't change anything else in the record. if you enter an incorrect reading then simply go to the history view, delete the record and re-enter it.

What's the easiest way to share my stats and blood glucose chart with my diabetes nurse? She doesn't use a spreadheet and so can't access my exported history data.

The easiest thing to do is email her a screenshot. With the screen you want to shared displayed, simply hold down the iPhone home button and press the power button briefly. The screenshot will be saved to your camera roll and you can email it from there.

I don't want to share my data, do I have to email my data to my diabetes educator?

You don't have to share your data with anyone unless you want to. The main purpose of the backup and export features is to allow you to archive your data on a PC and to allow access to the data for charting in a spreadsheet. If you have a good relationship with you doctor or diabetes educator, then you have the option of sending them a copy for analysis or review.

What happens to my personal settings and history data if my iPhone is lost or stolen?

We strongly advise that you backup your settings and history data reqularly via email. That way, if your phone is lost or stolen you will be able to restore your data to a freshly installed copy of RapidCalc on another iPhone.

How can I transfer my history data to my computer so I can view it in a spreadsheet?

To transfer your history data simply export the data to yourself via email. Open the email on your computer and you will see a file attached with name beginning with 'RC_History..' which contains your history data. The data is stored in an industry standard 'CSV' format which is supported by virtually all spreadsheet packages.

My doctor has suggested a change to one of my settings, will it mess up my historic data if I change the settings?

Each history record includes all the settings in effect at the time, so you can safely change your settings at any time without any impact on your historic data.

What happens if I want to keep more than 90 days worth of history?

RapidCalc keeps 90 days worth of history data, but by exporting your data by email at least once every 90 days, you can keep your history data on your PC for as long as you like.

When RapidCalc suggests an RAI dose of say 4.8 units and I press the “Save” button, the "Actual Dose Taken" value is rounded up to 5.0 units and I am immediately warned that the selected dose may cause a hypo. Why is the calculator suggesting a dose that may cause a hypo?

RapidCalc works to 0.1 units for maximum accuracy, but rounds the actual dose value to the suit the dose sizes available on your insulin pen. Depending on your insulin ratio, a rounded up value might be just enough to lower your BG below your hypo warning level. When this happens you have the choice of either dosing the suggested amount and eating slightly more carbohydrate or lowering the dose and eating slightly less.

What happens if I record a dose for a meal, but then decide to have an uplanned dessert?

If you use RapidCalc to calculate multiple bolus doses in quick succession you will find, in the subsequent calculations, that the meal component is offset by the insulin on board from the previous doses yielding a reduced, or zero, suggested RAI dose. In these circumstances you can calculate the RAI dose needed to cover an additional carb intake as follows:

  • Tick the 'BG not measured / Extra Carbs' option. RapidCalc will now assume that your blood glucose level is on-target and ignore any Insulin on board when calculating the suggested RAI dose.
  • Enter the additional carb portions using the 'Planned Carbohydrate Intake' slider as normal and read off the suggested RAI dose needed to cover the additional carb intake.
  • Add an explanatory note when saving the record.

When I use the 'time change' feature to back-date a record, I noticed that the 'Today' label was not positioned on today's date.

This is a known bug in the iPhone firmware which we expect Apple to fix in a future OS update. The bug is purely cosmetic, so for now just ignore the 'Today' label.

We are always happy to answer any questions regarding RapidCalc by email using the Contact Us page.