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per #1401 set highest sensitivity on low TT and halfBasal #1403

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Dec 18, 2021
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per #1401 set highest sensitivity on low TT and halfBasal #1403

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10 changes: 9 additions & 1 deletion lib/determine-basal/determine-basal.js
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Original file line number Diff line number Diff line change
Expand Up @@ -206,7 +206,15 @@ var determine_basal = function determine_basal(glucose_status, currenttemp, iob_
// e.g.: Sensitivity ratio set to 0.8 based on temp target of 120; Adjusting basal from 1.65 to 1.35; ISF from 58.9 to 73.6
//sensitivityRatio = 2/(2+(target_bg-normalTarget)/40);
var c = halfBasalTarget - normalTarget;
sensitivityRatio = c/(c+target_bg-normalTarget);
// getting multiplication less or equal to 0 means that we have a really low target with a really low halfBasalTarget
// with low TT and lowTTlowersSensitivity we need autosens_max as a value
// we use multiplication instead of the division to avoid "division by zero error"
if (c * (c + target_bg-normalTarget) <= 0.0) {
sensitivityRatio = profile.autosens_max;
}
else {
sensitivityRatio = c/(c+target_bg-normalTarget);
}
// limit sensitivityRatio to profile.autosens_max (1.2x by default)
sensitivityRatio = Math.min(sensitivityRatio, profile.autosens_max);
sensitivityRatio = round(sensitivityRatio,2);
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