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Practicality and value
You have probably studied various methods of increasing
your chances of conception. Perhaps you have tried many of them.
If so, here is what you've found:
Ultrasound: Nothing beats ultrasound for precisely
determining the time of release of the ovum. The problem is that
ultrasound cannot predict ovulation, only confirm it. Therefore,
unless you are being scanned several times a day, you are unlikely
to receive confirmation in time to do anything about it. While useful
in a medical context to establish whether you are indeed ovulating,
ultrasound is expensive and impractical for planning conception.
Blood serum LH: Measuring LH in the blood
is an excellent method for predicting ovulation in a medical context.
It can give several hours notice of ovulation, allowing a reasonable
amount of time for deposition of semen. However, the necessity of
frequent blood sampling makes it expensive and inappropriate for
home use.
Urine LH sticks: After LH has peaked in the
blood, it eventually makes its way into the urine and can be measured
by a urine LH stick. The problem is, that by the time LH makes it
to the urine, it is usually too late for sperm to be deposited in
time to reach the egg while it is still viable, even if intercourse
or AI occurs immediately. Not only does this method often provide
insufficient advance notice, but frequent urine samples are required
and stick color changes are not always easily interpreted. In addition,
in America's NIH Phase II study, using various urine LH tests, a positive
reading was not reached at all in 24% of the cycles we tested.
Temperature: You can't beat the price, but
measuring basal body temperature (BBT) is useful only for confirming
that ovulation has occurred. Again, it's too late. At best, you
can establish a pattern to your cycles and hope to guess correctly
next month.
Ferning microscopes: Makers of these tools
have picked up on the fact that salivary characteristics can indicate
the onset of ovulation. However, the accuracy of these products
is dependent on the user's ability to interpret the results. In
addition, extraneous factors such as stressand even the process
of collecting saliva itselfcan distort the results. For more
information, view our special summary on saliva fertility monitors.
| OvaCue
vs ClearPlan.
Simply speaking, OvaCue's Electrolyte Method
is more accurate, and therefore provides better guidance
for timing conception. According to the ClearPlan Physician's
Manual, its positive signal falls outside the fertile period
in over a quarter of the cycles tested.
In addition, many women find the daily handling
of urine samples to be undesirable. And then there
are those test sticks to buy. And buy. And buy... |
Fertility monitors comparison summary
| |
OvaCue/Cue
II
w / vaginal monitor |
Clearplan
Easy |
BBT |
Home
urine LH kit |
Serum
LH Assay |
Ultrasound |
| Predicts
ovulation |
Yes
5-7 days |
Yes
1-5 days 1 |
No |
Yes
0-24 hours |
Yes
36 hours |
No |
| Defines
complete window of fertility2 |
Yes |
? |
No |
No |
No |
No |
| Accuracy |
98% |
72%
1 |
? |
94%
3 |
~100% |
~100% |
| Confirms
Ovulation? |
Yes |
No |
Yes |
No |
No |
Yes |
| Home
use? |
Yes |
Yes |
Yes |
Yes |
No |
No |
| Monthly
cost4 |
$40
- OvaCue
$31 - Cue II |
$30-44
5 |
-- |
$25 |
~$75
per test |
$125-225
per test |
Notes.
1.
Source: Unipath ClearPlan Easy Physician's manual, page 23.
2.
Defined as a six-day period ending on the day of ovulation. Ref:
Timing of sexual intercourse in relation to ovulation. Wilcox AL
et al. N Engl J Med 1995; 333(23): 1517-1521.
3.
According to Unipath literature
4.
$US, Assuming 12 months of use
5.
Based on ClearPlan web site.
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