An optical sensor device configured to differentiate between red blood cells and free hemoglobin in a biological fluid being present in a vessel comprising: a light source configured to emit a light including a plurality of wavelengths, including at least one wavelength in a range of 650 nm to 900 nm, wherein the light source is oriented to emit the light to the vessel such that at least a portion of the light is exposed to the biological fluid and is reflected at a first time and at a second time that is subsequent to the first time; a light detector configured to receive at least a portion of the reflected light, analyze at least a portion of the received light and differentiate the wavelengths contained within the light to produce an optical spectrum of said at least a portion of the received light, determine a main wavelength from the optical spectrum at the first time and at the second time, measure the intensity of a target wavelength of said at least a portion of the received light at the first time to determine a first intensity of said at least a portion of the received light at said target wavelength and measure the intensity of the target wavelength of at least a portion of the received light at the second time to determine a second intensity of said at least a portion of the received light at said target wavelength; and a controller configured to compare the first intensity to the second intensity, generate an output indicative of a presence of red blood cells in the biological fluid or generate an output indicative of a presence of free hemoglobin in the biological fluid based upon a determination of whether the main wavelength is greater at the first time or at the second time and upon said comparison of the first intensity and the second intensity. a light source configured to emit a light including a plurality of wavelengths, including at least one wavelength in a range of 650 nm to 900 nm, wherein the light source is oriented to emit the light to the vessel such that at least a portion of the light is exposed to the biological fluid and is reflected at a first time and at a second time that is subsequent to the first time; a light detector configured to receive at least a portion of the reflected light, analyze at least a portion of the received light and differentiate the wavelengths contained within the light to produce an optical spectrum of said at least a portion of the received light, determine a main wavelength from the optical spectrum at the first time and at the second time, measure the intensity of a target wavelength of said at least a portion of the received light at the first time to determine a first intensity of said at least a portion of the received light at said target wavelength and measure the intensity of the target wavelength of at least a portion of the received light at the second time to determine a second intensity of said at least a portion of the received light at said target wavelength; and receive at least a portion of the reflected light, analyze at least a portion of the received light and differentiate the wavelengths contained within the light to produce an optical spectrum of said at least a portion of the received light, determine a main wavelength from the optical spectrum at the first time and at the second time, measure the intensity of a target wavelength of said at least a portion of the received light at the first time to determine a first intensity of said at least a portion of the received light at said target wavelength and measure the intensity of the target wavelength of at least a portion of the received light at the second time to determine a second intensity of said at least a portion of the received light at said target wavelength; and a controller configured to compare the first intensity to the second intensity, generate an output indicative of a presence of red blood cells in the biological fluid or generate an output indicative of a presence of free hemoglobin in the biological fluid based upon a determination of whether the main wavelength is greater at the first time or at the second time and upon said comparison of the first intensity and the second intensity. compare the first intensity to the second intensity, generate an output indicative of a presence of red blood cells in the biological fluid or generate an output indicative of a presence of free hemoglobin in the biological fluid based upon a determination of whether the main wavelength is greater at the first time or at the second time and upon said comparison of the first intensity and the second intensity.