The ornamental design for a bloodtestingchip, as shown and described.
FIG. 1 is a front view of a blood testing chip showing our new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a right side view thereof; and,
FIG. 6 is a left side view thereof.
The broken lines in FIGS. 1 and 4 are included for the purpose of illustrating portions of the blood testing chip that form no part of the claimed design.