Chronic kidney disease (CKD) is diagnosed when there has been an abnormal test for at least three months. If these tests were done days apart, then CKD cannot be diagnosed. This may have been an episode of acute kidney injury related to your diarrhea episode. I suggest that you allow some time to pass and then see your physician for further testing to include a serum creatinine, a calculated estimated glomerular filtration rate (eGFR) and urine testing for blood, protein and infection. If the test remains abnormal, then further testing for CKD may be in order.