Use this tool to get an estimated statistical chance of miscarriage based on common factors. Please remember this is an estimate and not medical advice.
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function calculateMiscarriageChance() {
var maternalAge = parseFloat(document.getElementById("maternalAge").value);
var gestationalWeek = parseFloat(document.getElementById("gestationalWeek").value);
var previousMiscarriages = parseFloat(document.getElementById("previousMiscarriages").value);
var resultDiv = document.getElementById("miscarriageResult");
if (isNaN(maternalAge) || isNaN(gestationalWeek) || isNaN(previousMiscarriages) ||
maternalAge 50 ||
gestationalWeek 20 ||
previousMiscarriages 10) {
resultDiv.innerHTML = "Please enter valid numbers for all fields. Age should be between 15-50, Gestational Week between 4-20, and Previous Miscarriages 0-10.";
return;
}
var baseRisk = 15; // General baseline risk for clinically recognized pregnancies (e.g., 15-20%)
// Adjust by Gestational Week
if (gestationalWeek = 6 && gestationalWeek = 8 && gestationalWeek = 10 && gestationalWeek 12) {
baseRisk -= 10; // Significantly lower risk after first trimester
}
// Adjust by Maternal Age
if (maternalAge = 30 && maternalAge = 35 && maternalAge = 40 && maternalAge = 45) {
baseRisk += 15;
}
// Adjust by Number of Previous Miscarriages
if (previousMiscarriages === 1) {
baseRisk += 3;
} else if (previousMiscarriages === 2) {
baseRisk += 7;
} else if (previousMiscarriages >= 3) {
baseRisk += 12;
}
// Ensure risk is within a reasonable range (e.g., 1% to 90%)
var estimatedRisk = Math.max(1, Math.min(90, baseRisk));
var successfulPregnancyChance = 100 – estimatedRisk;
resultDiv.innerHTML =
"Based on your inputs:" +
"Estimated chance of miscarriage: " + estimatedRisk.toFixed(1) + "%" +
"Estimated chance of successful pregnancy: " + successfulPregnancyChance.toFixed(1) + "%" +
"This calculator provides an estimated statistical chance based on common factors and general population data. It is not a diagnostic tool and cannot predict individual outcomes. Always consult with a healthcare professional for personalized medical advice and concerns.";
}
Understanding Miscarriage Risk: Factors and Statistics
Miscarriage, the spontaneous loss of a pregnancy before the 20th week, is a more common experience than many realize. While often emotionally devastating, it's important to understand the factors that contribute to its occurrence and to remember that it is rarely the result of anything a person did or didn't do.
What is a Miscarriage?
A miscarriage is defined as the loss of a pregnancy before the 20th week of gestation. The vast majority of miscarriages (around 80%) occur within the first trimester (the first 12 weeks of pregnancy). After 20 weeks, pregnancy loss is typically referred to as a stillbirth.
Common Causes of Miscarriage
The most common cause of miscarriage, especially in the first trimester, is chromosomal abnormalities in the developing fetus. These are random errors that occur during cell division and are not usually inherited from the parents. Other factors can include:
Maternal Age: The risk of miscarriage increases significantly with age, particularly after 35.
Gestational Week: The risk is highest in the very early weeks of pregnancy and decreases substantially as the pregnancy progresses.
Previous Miscarriages: A history of recurrent miscarriages (two or more consecutive losses) can indicate a higher risk for future pregnancies.
Uterine or Cervical Problems: Structural issues with the uterus or a weakened cervix can contribute to miscarriage.
Chronic Medical Conditions: Uncontrolled diabetes, thyroid disorders, or certain autoimmune diseases can increase risk.
Infections: Some infections can lead to pregnancy loss.
Lifestyle Factors: Smoking, heavy alcohol consumption, and illicit drug use are known risk factors. High caffeine intake may also play a role.
Weight: Both being underweight and overweight can be associated with an increased risk.
How Our Miscarriage Risk Estimator Works
Our calculator provides an estimated statistical chance of miscarriage by considering three key factors:
Your Age (years): As discussed, maternal age is a significant predictor of miscarriage risk. The calculator adjusts the base risk upwards for older maternal ages.
Current Gestational Week: The stage of pregnancy is crucial. The risk is highest in the earliest weeks and declines sharply as the pregnancy advances into the second trimester. Our calculator reflects this decreasing risk over time.
Number of Previous Miscarriages: A history of prior miscarriages can indicate an elevated risk for future pregnancies. The calculator incorporates this factor by increasing the estimated risk based on the number of previous losses.
The calculator uses a baseline risk and then applies adjustments based on the values you provide for these three inputs. The final percentage represents an estimated statistical probability, not a definitive prediction for your individual pregnancy.
Important Disclaimer
It is crucial to understand that this Miscarriage Risk Estimator is a statistical tool based on general population data and common risk factors. It is designed to provide an educational estimate and is NOT a substitute for professional medical advice, diagnosis, or treatment. Every pregnancy is unique, and individual circumstances can vary greatly.
If you have concerns about your pregnancy, experience symptoms such as vaginal bleeding, abdominal pain, or have any questions about your risk factors, please consult with a qualified healthcare professional immediately. They can provide personalized guidance, perform necessary examinations, and offer the most accurate assessment of your situation.