'Border' means borderline or gray zone. Section in which the parameters are not clearly defined—i.e., are neither ‘positive’ nor ‘negative’, is marked as a boundary. If the border is displayed, a test to identify malignant tumors is recommended with a monthly interval.
False-positive means the probability of malignancy is marked as 'high' or 'very high' even when there is no malignant tumor.
. To date, the test is not recommended for patients with pyometra since they tend to show high probability of false positive. Also, since pancreatitis and IMHA (immune mediated hemolytic anemia) show false-positive results in about 30% of patients, such possibility must be considered in interpretation.