Methods of measuring hematocrit in fluidic channels including conductivity sensor

A system for determining hematocrit level in a blood sample, the system comprising:

• a first portion, the first portion comprising:
• at least one fluid channel, wherein the fluid channel is a microfluidic channel;
• a fluid actuator;
• an analyte sensor disposed within the fluid channel;
• a conductivity sensor comprising at least two electrodes, the conductivity sensor disposed within the fluid channel upstream of the analyte sensor;
• and
• an introducer;
• and
• a second portion, the second portion comprising at least one well configured to hold at least one material;
• wherein at least one of the first and second portions is moveable with respect to the other;
• and
• wherein the introducer is configured to obtain at least a portion of the material from the at least one well and deliver it to the fluid channel, and wherein the fluid actuator is configured to move at least a portion of the material in the fluid channel to allow the hematocrit level of the blood sample to be determined.