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Comparison of monitors to avoid a pregnancy

A comparison of the fertility monitors Persona, Cyclotest and Lady-Comp which often used as natural alternative to hormonal contraception.

The Pearl Index is an important indicator of a contraceptive's reliability. It shows how many unplanned pregnancies occurred when 100 women used this method of contraception for 1 year. Methods with a Pearl Index score below 1 are regarded as reliable.

Comparison ofPersonaCyclotestLady-Comp
Pearl Index (1)6 (2)1 to 3 (2)0.7 (3)
Shows ovulationyesyesyes
Certified as a contraceptivenonoyes (4)
Suitable for pregnancy planningyesyesyes
What is analysed?urinetemperature + test (5)temperature
When is the measurement taken?morningmorning (6)morning (6)
Where is the measurement taken?on the toiletin bed + toiletin bed
How long does measuring take?5+ minutes1 min + test1 minute
When is fertility shown?after 5 minutesat onceat once
How often is the measurement taken?8x per cycledaily until after ovulationdaily if possible
Identifies days of high fertility1 to 2 daysyes5 days
Identifies non-fertile days at the beginning of the cyclefrom the first cycle onwardsfrom the sixth cycle onwardsfrom the first cycle onwards
Suitable for cycles of23 to 35 daysup to 46 days100+ days
Use after pill / pregnancyafter 3+ monthsfrom first menstruationat once
Shows previous cycles180 days99 days180 days
Cycle data saved6 months12 months20 years
Cycle predictioncurrent cycle (7)current cycle (7)the next 6 days
Integrated alarm clocknoyesyes
Period of measurement6 hours exactly (8) 4 hours exactly (8)6 hours (variable) (9)
Start usingat beginning of cycleat beginning of cycleat any time
Initial cost£ 80 (10)£ 195 (11)£425 (10)
Consumption per month8 test sticks5 ovulation testsnone
Cost per month (11) £10£12.50£0
Cost after 1 year£200 £345£425
Cost after 3 years£440 £645£425
Cost after 7 years£920 £1.095£425

Notes on the footnotes:
  1. The Pearl Index is the number of unplanned pregnancies if 100 women use a method correctly for one year.
  2. Manufacturer information
  3. Independent Clinical Studies
  4. Medical Product 2b according to the Medical Devices Directive 93/42 EEC
  5. In addition,the results of either a cervical mucus or urine analysis can be entered.
  6. Temperature is always taken by inserting the thermometer below the tongue following the longest period of uninterrupted sleep, undisturbed by e.g. fever, infections, alcohol consumed the previous evening, less than 5h sleep.
  7. The key data of a cycle such cycle length and day of ovulation.
  8. The measurement period is set by the time of the first reading of the cycle.
  9. The time the measurement is taken can be changed at any time.
  10. Recommended price of the manufacturer.
  11. Including software to save cycle data to a Windows computer. Not suitable for Mac.
  12. Current market price Amazon UK 20 September 2014.