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INRstar N3 Help

Individual patient TTRs

This report lists your patients with active treatment plans, in ascending order of their Time in Therapeutic Range (TTR) percentage, calculated by looking at the most recent 12 months worth of treatments for each patient, up to the last day of last month.

You can change and manually select the band percentages (see how it works below).

Use this report to:

  • help identify which patients are candidates for an alternative anti-coagulant, or who are potential self-testers

Please Note: This report contains changes made to INRstar from the previous day and not from the day the report is run.

Please look under 'Additional files' on the right-hand side of this page to view or download an example report


You may adjust the TTR ranges that patients are grouped into, by changing the TTR Band Upper Limit parameters at the top of the page, this enables you to report on any banding structure you prefer, so long as there are 7 bands.


The Upper Limit for one band, becomes the Lower Limit for the next band up.  For example, by default bands 1, 2 and 3 are:


1)      0 – 40% TTR

2)      40 – 50% TTR

3)      50 – 60% TTR


40% is the Upper Limit of band 1, and hence also the Lower Limit of band 2.  If you change the TTR Band 1 Upper Limit to 30%, then the Lower Limit of band 2 will automatically drop to 30%, and the bands will change like this:


1)      0 – 30%  TTR

2)      30 – 50% TTR

3)      50 – 60% TTR


Note that a patient with a TTR of exactly 50.00% would be shown in the 30-50% TTR band, and a patient with a TTR of 50.01% for example, would be shown in the 50 – 60% band. 


However TTR percentages are rounded to 1 decimal place, so whilst both those patients would show a TTR of 50% on the report, they are correctly grouped into different bands. 


This is why if you look at patients in their bands, you may see some patients showing 50% TTR grouped into band 2, and some patients showing 50% TTR grouped into band 3. Really their TTRs might be something like 49.96% and 50.03% for example, but the report display rounds them to 50%.


The report shows sub-totals of active patients for each band, and a grand total at the bottom.


You may further filter the list of patients by:


·         Selecting their Testing Location (if you have permission to report on more than one)

·         Selecting specific diagnoses, rather than the default of All Diagnoses

·         Selecting patients identified by the group: Complex, Home Visit, INR Self-Testing or requiring Transport, or leaving it at the default of (unfiltered) to list patients of all groups.

Yes – INRstar complies with the 2014 NICE guidance on TTR calculations:

"use a validated method of measurement such as the Rosendaal method for computer-assisted dosing or proportion of tests in range for manual dosing"  - INRstar uses the Rosendaal method

"exclude measurements taken during the first 6 weeks of treatment" - INRstar excludes the first 6 weeks of tests and tests flagged as initiation tests.

"calculate TTR over a maintenance period of at least 6 months" – INRstar alerts you with a warning triangle if less than 6 months of tests are available.  

Category: Warfarin Control
 TTR ,  Admin Reports