A fluid analysis system, comprising: a fluidic die, wherein the fluidic die comprises: the fluid chamber configured to hold a volume of fluid to be analyzed; and an impedance sensor affixed within the fluid chamber; an electrical stimulus source configured to supply an electrical stimulus to the impedance sensor in the fluid chamber on the fluidic die, wherein the electrical stimulus source is configured to supply a first electrical stimulus to measure a real component of impedance and a second electrical stimulus to measure an imaginary component of impedance; the impedance sensor being configured to measure an impedance of the fluid in the fluid chamber based on the first and the second electrical stimulus; a sample and hold circuit configured to capture an output from the impedance sensor and to hold its value at a constant level for a specified period of time; wherein the stimulus source is configured to supply the first electrical stimulus to charge a capacitance of the impedance sensor and to reach a steady state of the output from the impedance sensor; and wherein the sample and hold circuit is configured to sample the output while the stimulus source applies the first electrical stimulus; wherein the stimulus source is configured to supply the second electrical stimulus for a predetermined period, and wherein the sample and hold circuit is configured to sample the output at the end of the predetermined period of time; an A/D converter configured to convert the sampled output from the sample and hold circuit to a digital output; and an evaluator device configured to: determine the real component of the impedance when the first electrical stimulus is applied such that the capacitance of the impedance sensor is charged and the output of the impedance sensor has reached a steady state; determine the imaginary component of the impedance from the output of the impedance sensor sampled at an end of the predetermined period of time of supply of the second stimulus; and determine, from a database, at least one property of the fluid based on the digital output of the A/D converter comprising the real component of the impedance and the imaginary component of the impedance, and on data describing the electrical stimulus. a fluidic die, wherein the fluidic die comprises: the fluid chamber configured to hold a volume of fluid to be analyzed; and an impedance sensor affixed within the fluid chamber; an electrical stimulus source configured to supply an electrical stimulus to the impedance sensor in the fluid chamber on the fluidic die, wherein the electrical stimulus source is configured to supply a first electrical stimulus to measure a real component of impedance and a second electrical stimulus to measure an imaginary component of impedance; the fluid chamber configured to hold a volume of fluid to be analyzed; and an impedance sensor affixed within the fluid chamber; an electrical stimulus source configured to supply an electrical stimulus to the impedance sensor in the fluid chamber on the fluidic die, wherein the electrical stimulus source is configured to supply a first electrical stimulus to measure a real component of impedance and a second electrical stimulus to measure an imaginary component of impedance; the impedance sensor being configured to measure an impedance of the fluid in the fluid chamber based on the first and the second electrical stimulus; a sample and hold circuit configured to capture an output from the impedance sensor and to hold its value at a constant level for a specified period of time; wherein the stimulus source is configured to supply the first electrical stimulus to charge a capacitance of the impedance sensor and to reach a steady state of the output from the impedance sensor; and wherein the sample and hold circuit is configured to sample the output while the stimulus source applies the first electrical stimulus; wherein the stimulus source is configured to supply the second electrical stimulus for a predetermined period, and wherein the sample and hold circuit is configured to sample the output at the end of the predetermined period of time; an A/D converter configured to convert the sampled output from the sample and hold circuit to a digital output; and an evaluator device configured to: determine the real component of the impedance when the first electrical stimulus is applied such that the capacitance of the impedance sensor is charged and the output of the impedance sensor has reached a steady state; determine the imaginary component of the impedance from the output of the impedance sensor sampled at an end of the predetermined period of time of supply of the second stimulus; and determine, from a database, at least one property of the fluid based on the digital output of the A/D converter comprising the real component of the impedance and the imaginary component of the impedance, and on data describing the electrical stimulus. determine the real component of the impedance when the first electrical stimulus is applied such that the capacitance of the impedance sensor is charged and the output of the impedance sensor has reached a steady state; determine the imaginary component of the impedance from the output of the impedance sensor sampled at an end of the predetermined period of time of supply of the second stimulus; and determine, from a database, at least one property of the fluid based on the digital output of the A/D converter comprising the real component of the impedance and the imaginary component of the impedance, and on data describing the electrical stimulus.