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Gradient strip minimum inhibitory concentration (MIC)

Antibiotic Reference Laboratory

In this test, a preformed antimicrobial gradient from a gradient strip diffuses into the agar medium inoculated with the test organism. The MIC is read directly from the scale printed on the gradient strip at the point where the ellipse of the growth inhibition intercepts the strip. A gradient strip MIC value that falls between the conventional two-fold dilutions is rounded up to the next two-fold dilution value before interpretation.



Health Science

Lab name

Antibiotic Reference Laboratory

Lab location

Kenepuru Science Centre, Porirua

Test name

Gradient strip minimum inhibitory concentration (MIC)


Aerobic or facultative bacteria

Requested for surveillance


Notice required


Routine turnaround time

4 working days for reference specimens

Sample requirements

Pure culture

Media requirements

A slope of any medium that supports the growth of the organism

Pre-transport requirements

Ambient temperature

Transport requirements

Ambient temperature

Unacceptable sample types

Clinical specimens will not be accepted.

How results reported

MIC (mg/L) and interpretation according to EUCAST interpretive standards.

Referral link