The blood pregnancy test calculator works out blood test date, urine test date and ovulation day from menstrual cycle length, urine test sensitivity, embryo’s age, your last period, urine test sensitivity and ivf transfer day. Enter what you have and the relationship is applied straight away, so you get the answer without working through the algebra yourself.
What Is the Blood Pregnancy Test Calculator?
The blood pregnancy test calculator gives you an estimate of blood test date, urine test date and ovulation day based on menstrual cycle length, urine test sensitivity, embryo's age, your last period, urine test sensitivity and ivf transfer day.
It is a quick reference figure rather than a diagnosis, and it is most useful for tracking how a number moves over time rather than for interpreting a single reading.
How the Blood Pregnancy Test Estimate Is Worked Out
The calculation follows published reference relationships, so it is a reasonable approximation when the inputs are accurate. It assumes an average adult and does not account for individual variation.
If you are comparing two people, or the same person over a period of weeks, keep the method and the inputs identical. A change in the method can easily look like a change in the person.
What This Calculator Does Not Do
It does not diagnose anything, and it does not replace advice from a clinician. If a figure comes out at an extreme, or if it differs sharply from what you expect, that is a reason to speak to a professional rather than to adjust the inputs.
Nothing you type here is stored or sent anywhere. The whole calculation happens in your browser.
A Worked Example
Working through an example, with menstrual cycle length set to 10, urine test sensitivity set to 3.000000000000000, embryo's age set to 0.000000000000000, the calculator returns urine test date of 12, and ovulation day of 1, and blood test date of 10. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out blood test date?
Enter menstrual cycle length, urine test sensitivity, embryo's age, your last period, urine test sensitivity and ivf transfer day. The calculator then works through the relationship and reports blood test date, urine test date and ovulation day.
What does the blood pregnancy test actually calculate?
It takes menstrual cycle length, urine test sensitivity, embryo's age, your last period, urine test sensitivity and ivf transfer day and converts them into blood test date, urine test date and ovulation day using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter menstrual cycle length?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Why does a small change in one value move the answer so much?
That happens when an output depends on a ratio, because dividing by a small number magnifies any change in it. Check the units first, then check whether the value you entered is in the range the relationship was designed for.
Is the answer exact?
It is as exact as the formula and the inputs allow. The method itself is the standard one for this problem, so the only sources of error are the figures you enter and the precision you ask for.