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INRstar N3 Help

Patients by TTR Band Report - Patients Tested Elsewhere Report

This version of the TTR band report only shows treatments for patients not tested by your location, for whom you are the registered practice.

If you are logged in at a "View Only" site, i.e. you have view only access to all patients registered at your practice, than this report allows you to see TTR details for those patients only.

If you are logged in as a testing location, than this report will show you TTR details for patients whose anticoagulation you do not manage, but for whom you are the registered practice.

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.

We currently calculate TTR using the Rosendaal method (ie total days in range/total days on treatment) for individual patients and separately for the whole location.

We exclude any treatments which are flagged as ‘induction’ and we also exclude any treatments within the first 6 weeks of a patient’s start date in line with the latest NICE guidelines.

NICE AF guidelines recommend only including patients who have at least 6 months of results.


The ‘Warfarin Quality Metrics (NPSA Audit)’ report shows the TOTAL calculated TTR for all  patients at a location for the preceding 12 months. 

The ‘Patient TTR band’ report displays the frequency distribution of the TTR results of INDIVIDUAL patient TTRs at a location for the last 12 months

These graphs  are not directly comparable.

Category: Warfarin Control