Beta-lactamase Milk Antibiotic Test

Interpretation of the Results

A color line always appears in the upper section of the test strip to indicate that the test strip is working properly. This line is the Control Line (C). Two lines in the lower section of the test strip indicate the test results for β-lactams and tetracyclines respectively. These two lines are the Test Lines. 
Negative Sample (-): The colour of test line (T1) is darker than or the same as control line (C) indicates the sample contains tetracyclines less than the limit of detection; The colour of test line (T2) is darker than or the same as control line (C) indicates the sample contains β-lactams less than the limit of detection. (Please see image above).
Positive Sample (+): The colour of test line (T1) is lighter than control line (C) or no colour appears in T1 line zone, this indicates the sample contains tetracyclines greater than or equal to the limit of detection; the colour of test line (T2) is lighter than control line (C) or no colour appears in T2 line zone, this indicates the sample contains β-lactams greater than or equal to the limit of detection 
Invalid results: 
If there is no line in control zone, the test is invalid and the sample should be re-tested by using a valid test strip.