The ornamental design for a bloodanalysisinstrument, as shown and described.
FIG. 1 is a right side perspective view of a blood analysis instrument in accordance with the new design;
FIG. 2 is a right side elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a top elevation view thereof;
FIG. 5 is a bottom elevation view thereof;
FIG. 6 is a front elevation view thereof; and,
FIG. 7 is a rear elevation view thereof.
The broken line showing in FIGS. 1 and 6-7 is included for the purpose of illustrating portions of the instrument that form no part of the claimed design.