When the specimen is dropped into the cassette, capillary action carries the specimen and it migrates along the membrane. When LH in the specimen reaches the test zone region of the membrane, it will form a
coloured line. Absence of this coloured line suggests a negative result. To serve as a procedure control, a coloured line will appear at the control zone region, if the test has been performed properly. The test strip detects ovulation with a high degree of certainty. It is a valuable tool in helping to achieve pregnancy since it determines the period that the egg and the sperm cells will meet in the best conditions. Ovulation may be irregular because of circumstances, emotions and other factors in your life. You cannot presume that ovulation always occurs at the same time after menstruation; therefore you should test again after each menstrual cycle.