Effect of time and storage temperature on canine and feline erythrocyte sedimentation rate

We aimed to test the influence of storage temperature and time for canine and feline ESR. Forty dogs and 12 cats were included and randomly allocated in “room temperature” and “refrigerated” groups. Both groups had the T0 ESR measures few minutes after complete blood count. Afterwards, room temperature group had ESR measured at 2, 4, 6 and 8h after T0, whereas the “refrigerated” group had the blood sample stored at 4-6°C for 24 and then T24h ESR was measured. In each ESR measurement, [1] blood samples were put on a tube rocker waiting for ESR analysis; [2] before inserting the blood tube in the MINI-PET ESR instrument, samples were gently mixed again by complete inversion 10 times; (3) each mixed blood tube was inserted in the one of the four MINI-PET tubes position; (4) on the machine display, patient's species has to be chosen and the 14 minutes countdown started; (5) after the 14 minutes optical reading, the ESR result (mm/h) is displayed on the machine. ESR of canine samples at room temperature were significantly stable until T6, while feline samples remained stable at T8. After 24h at refrigerated temperature, both canine and feline samples were stable. • MINI-PET is an ESR automatic continuous-loading instrument that can analyze up to four EDTA blood samples simultaneously using an optical system that measures the erythrocytes sedimentation level • We aimed to test influence of storage temperature and time for canine and feline ESR • At room temperature, dogs’ samples were stable within 6 hours from collection, and cats’ samples were stable until 8h. At refrigerated temperature, there was no difference in T0-T24 ESR in both canine and feline samples