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Mobile Units — Growth Trend
Every bar is one county, and its height and color show how far that county's mobile blood-collection volume has moved from where it started.
The map animates 65 rolling 12-month windows. A window labeled Jan 2020 – Dec 2020 is the total number of units collected in those twelve months, and the next window slides forward one month. Rolling totals are used so normal seasonal swings do not read as growth or decline.
Each county's first window is its own starting line. After that, a bar rises when that county is running above its own start and drops below the surface when it is running under it.
Green and tall means the county is running above its own start. Red and dropped below the surface means it is running under. Pale and flat means little change. Counties with no reported units in the selected channel stay flat and neutral — that is missing data, not zero.
Color reaches full strength at 50% change in either direction and holds there, so a typical county reads as a real green or red instead of a pale wash. Bar height keeps the full range, which is what separates the extremes — one county in this data has moved 5,772%. Hover any county, or click it, for the actual number.
Unit counts come from the Biomedical Services workbook (rolling 12-month collections, pulled by Troy for Ka Yee Lai, August 2026) — 65 rolling windows for every county that reports, on its own Mobile, Fixed Site, and Total tabs. Counties are joined on FIPS. Nothing here is modeled or estimated.
The workbook carries eleven windows past this timeline, but those are partial — the last one covers a single month — so volume falls off a cliff for reasons that have nothing to do with collections. This map stops at the last true 12-month window, May 2025 – Apr 2026.
Mobile + Fixed Site does not always equal Total. Some units were originally miscoded as fixed site and were removed from the mobile tab without being added back. The gap is 30,195 units out of 294.8 million, about 0.01%. Total is taken straight from the workbook's own Total tab.
The divisions are the BioMed divisions, not the humanitarian ones. The two do not draw the same lines: about twenty counties, including all of Delaware and coastal North Carolina, belong to a different division under each. If a county turns up somewhere you did not expect, that is why.
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