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Looking at several physiological variables, a woman can learn to identify the days With a positive result (or ferning pattern) ovulation is most likely to occur. Sep 17, - The presence of amniotic fluid is determined by the appearance of a characteristic crystal pattern. False positives have been recorded as a result of fingerprints, and contamination with blood, semen or cervical mucus. The Fern Test has a reported sensitivity of 51% for women not in labour, and a specificity of 70%.