Changing injection day, and the interval that results
Changing injection day, and the interval that results
Blog Article
Moving a weekly dose from one day of the week to another creates exactly one irregular interval, and the size of that interval depends entirely on which direction you move.
Moving later is straightforward. Tuesday to Friday is three days added, so one interval of 10 days, then 7 thereafter. Tuesday to the following Monday is six days added, one interval of 13, then 7. The maximum is six, because seven days later is the same day again.
Moving earlier shortens an interval, and the arithmetic is the mirror image. Tuesday to the preceding Saturday is three days removed, so one interval of 4 days, then 7. Tuesday to Wednesday of the same week, if that Wednesday has already passed, is not available; you would take the following Wednesday and that is a lengthening of one day, interval 8.
In practice most people prefer lengthening because shortening compresses two doses closer together than the schedule intended. Moving from Tuesday to Saturday can be done as a 4 day interval this week or as an 11 day interval by waiting for the Saturday after next. Same destination, opposite perturbation, and the choice is worth making deliberately rather than by whichever Saturday comes to mind.
Multi step moves are worth avoiding. Shifting a day at a time over six weeks produces intervals of 8, 8, 8, 8, 8, 8, which is 48 days for six doses instead of 42, and the sixth dose lands six days later than the original grid would have put it. That is the same total displacement as one 13 day interval but spread thin, which some people prefer and which makes the interval column look uniformly wrong rather than obviously exceptional. Recording the intent in a peptide tracker keeps a gradual shift from reading as six errors.
Whichever route you take, the vial arithmetic changes by exactly the displacement. A six day lengthening pushes the run out date six days later and the reorder trigger with it. Six single day lengthenings do the same thing over a longer period. The milligrams are identical either way, which is the reassuring part: a day change costs nothing in material and only moves dates. Letting a calculator that keeps the vial figures recompute the run out from the actual dose dates means you do not have to remember to adjust it.
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