Count the interval from an ovulation date to the start of the following period.
| Input | What it means |
|---|---|
| Ovulation date | The calendar date for this event; the order of start and end dates affects the interval. |
| First day of period | The calendar date for this event; the order of start and end dates affects the interval. |
Ovulation on June 1 followed by a period on June 15 gives an elapsed interval of 14 days.
Use the calculation to make the method and its inputs easier to check with a healthcare professional. Its meaning depends on the clinical setting and on whether the underlying method is appropriate for that person.
No. It describes a calculation or score from the supplied information. A qualified clinician must check the measurements, the method’s applicability and the wider clinical picture.
Use the units specified in the form and select a conversion only where the page provides one. Different substances need different conversion factors; a mismatch can produce a plausible but incorrect result.
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