The thermal method is considered fully effective when a laboratory test, the spermogram, confirms a sperm concentration of less than 1 million per milliliter. For added reassurance, if you wish, you can request a second spermogram 3 weeks later to confirm the result of the first.
It's important to note that, even if a spermogram shows less than 1 million sperm per milliliter, forgetting or interrupting ring wear for more than 24 hours may result in a temporary resumption of fertility. In such cases, it is advisable to wait at least one month after the omission before performing a new spermogram to ensure that contraception is still effective, and to use a second method during this period.
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