Why I Look at Several Lines, Not One

Why I Look at Several Lines, Not One

Sometimes I spread three sheets of paper across my desk: the check-up results from two years ago, last year, and this year.

Something appears when the three lie side by side that no single sheet can show. Not one line has crossed its threshold, yet all three are edging in the same direction. The word "normal" printed on each sheet is entirely correct. It is only that the form was built to measure one line at a time, so it has no place to record that the lines moved together.

No single sheet is wrong. A reference line is drawn to separate disease from not-disease; it is not a mark showing where a healthy body sits. So every line can be inside the boundary while the body has already changed. The form measures one line at a time. The body moved several at once.

And change in the body does not happen in one place only. Fatigue arrives before the numbers. The scale reads differently morning and evening. Blood pressure, blood sugar and weight push one another along. Even the four lines of a lipid panel move in a sequence. Boundaries, too, are more often loosened a little across several layers than breached all at once.

Measured one at a time, everything is normal. That is the place I keep returning to.

So I do not spend long staring at what a single number is. I set several down together and look at where they are going. When not one of them is yet a disease, that direction is the only thing there is to read.

Laying three sheets side by side takes a few seconds. Those few seconds tell a different story than any one sheet does.