A cartridge for use with an analyzer console , the cartridge comprising: a blood sample receiver configured to receive a blood sample to be tested; blood processing and testing paths , each blood processing and testing path being configured to receive a portion of the blood sample and comprising: a measuring chamber in fluid communication with the blood sample receiver , the measuring chamber having a selected internal volume to contain the portion of the blood sample; a mixing chamber in fluid communication with the measuring chamber and containing a reagent, the mixing chamber being configured to receive the portion of the blood sample from the measuring chamber and to allow the portion of the blood sample to contact the reagent; a blood testing chamber configured to receive a mixture based on the portion of the blood sample and the reagent for a test to be performed on the mixture within the blood testing chamber ; and wherein mixing to produce the mixture occurs in the mixing chamber and in a channel downstream from the mixing chamber ; a vacuum application port and an air pressure vent ; wherein a negative pressure is applied via the vacuum application port , wherein the air pressure vent can be opened or closed by the analyzer console , and wherein the negative pressure at the vacuum application port and the air pressure vent closed controls flow of a portion of the blood sample into each measuring chamber . a blood sample receiver configured to receive a blood sample to be tested; blood processing and testing paths , each blood processing and testing path being configured to receive a portion of the blood sample and comprising: a measuring chamber in fluid communication with the blood sample receiver , the measuring chamber having a selected internal volume to contain the portion of the blood sample; a mixing chamber in fluid communication with the measuring chamber and containing a reagent, the mixing chamber being configured to receive the portion of the blood sample from the measuring chamber and to allow the portion of the blood sample to contact the reagent; a blood testing chamber configured to receive a mixture based on the portion of the blood sample and the reagent for a test to be performed on the mixture within the blood testing chamber ; and a measuring chamber in fluid communication with the blood sample receiver , the measuring chamber having a selected internal volume to contain the portion of the blood sample; a mixing chamber in fluid communication with the measuring chamber and containing a reagent, the mixing chamber being configured to receive the portion of the blood sample from the measuring chamber and to allow the portion of the blood sample to contact the reagent; a blood testing chamber configured to receive a mixture based on the portion of the blood sample and the reagent for a test to be performed on the mixture within the blood testing chamber ; and wherein mixing to produce the mixture occurs in the mixing chamber and in a channel downstream from the mixing chamber ; a vacuum application port and an air pressure vent ; wherein a negative pressure is applied via the vacuum application port , wherein the air pressure vent can be opened or closed by the analyzer console , and wherein the negative pressure at the vacuum application port and the air pressure vent closed controls flow of a portion of the blood sample into each measuring chamber . <EOS>