Miscarriage Risk Calculator

Miscarriage Risk Estimator

Estimate your statistical risk of miscarriage based on common factors. This tool is for informational purposes only and not a substitute for professional medical advice.

(Enter weeks from last menstrual period, typically 4-20 weeks)

Disclaimer: This calculator provides a statistical estimation based on general population data and common risk factors. It is NOT a diagnostic tool and cannot predict individual outcomes. Many factors influence pregnancy, and every pregnancy is unique. Always consult with a healthcare professional for personalized medical advice and concerns.

function calculateMiscarriageRisk() { 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"); // Input validation if (isNaN(maternalAge) || maternalAge 50) { resultDiv.style.display = "block"; resultDiv.style.backgroundColor = "#f8d7da"; resultDiv.style.borderColor = "#f5c6cb"; resultDiv.style.color = "#721c24"; resultDiv.innerHTML = "Please enter a valid age between 15 and 50 years."; return; } if (isNaN(gestationalWeek) || gestationalWeek 20) { resultDiv.style.display = "block"; resultDiv.style.backgroundColor = "#f8d7da"; resultDiv.style.borderColor = "#f5c6cb"; resultDiv.style.color = "#721c24"; resultDiv.innerHTML = "Please enter a valid gestational week between 4 and 20."; return; } if (isNaN(previousMiscarriages) || previousMiscarriages < 0) { resultDiv.style.display = "block"; resultDiv.style.backgroundColor = "#f8d7da"; resultDiv.style.borderColor = "#f5c6cb"; resultDiv.style.color = "#721c24"; resultDiv.innerHTML = "Please enter a valid number for previous miscarriages (0 or more)."; return; } var baseRiskPercentage = 0; var riskExplanation = ""; // 1. Base Risk based on Maternal Age if (maternalAge = 25 && maternalAge = 30 && maternalAge = 35 && maternalAge = 40 && maternalAge = 45 baseRiskPercentage = 50; riskExplanation += "Your age (" + maternalAge + " years) is a very significant factor, leading to a higher base risk. "; } // 2. Adjustment based on Gestational Week (multiplier) var weekMultiplier = 1; if (gestationalWeek = 6 && gestationalWeek = 8 && gestationalWeek = 12 && gestationalWeek = 14 weekMultiplier = 0.1; // Extremely low riskExplanation += "At " + gestationalWeek + " weeks, the risk of miscarriage is very low. "; } var currentRisk = baseRiskPercentage * weekMultiplier; // 3. Adjustment based on Previous Miscarriages (additive) var previousMiscarriageAdditive = 0; if (previousMiscarriages == 1) { previousMiscarriageAdditive = 3; riskExplanation += "Having 1 previous miscarriage slightly increases the overall risk. "; } else if (previousMiscarriages == 2) { previousMiscarriageAdditive = 7; riskExplanation += "Having 2 previous miscarriages moderately increases the overall risk. "; } else if (previousMiscarriages >= 3) { previousMiscarriageAdditive = 12; riskExplanation += "Having " + previousMiscarriages + " previous miscarriages significantly increases the overall risk. "; } currentRisk += previousMiscarriageAdditive; // Cap the risk between 0 and 100 currentRisk = Math.max(0, Math.min(100, currentRisk)); var riskCategory = ""; if (currentRisk < 5) { riskCategory = "Very Low"; } else if (currentRisk < 15) { riskCategory = "Low"; } else if (currentRisk < 25) { riskCategory = "Moderate"; } else if (currentRisk < 40) { riskCategory = "High"; } else { riskCategory = "Very High"; } resultDiv.style.display = "block"; resultDiv.style.backgroundColor = "#e9f7ef"; resultDiv.style.borderColor = "#d4edda"; resultDiv.style.color = "#155724"; resultDiv.innerHTML = "

Estimated Miscarriage Risk: " + currentRisk.toFixed(1) + "%

" + "Risk Category: " + riskCategory + "" + "" + riskExplanation + ""; }

Understanding Miscarriage Risk

Miscarriage, also known as spontaneous abortion, is the spontaneous loss of a pregnancy before the 20th week. It's a common occurrence, affecting a significant percentage of pregnancies, often before a woman even knows she's pregnant. While it can be a deeply distressing experience, it's important to understand that most miscarriages are not preventable and are often due to factors beyond anyone's control.

Common Factors Influencing Miscarriage Risk:

  1. Maternal Age: This is one of the most significant factors. The risk of miscarriage increases with age, particularly after 35. This is primarily due to a higher likelihood of chromosomal abnormalities in eggs as a woman ages.
    • Under 30: ~10-15%
    • 30-34: ~15-20%
    • 35-39: ~20-35%
    • 40-44: ~35-50%
    • 45+: ~50% or higher
  2. Gestational Week: The risk of miscarriage is highest in the very early weeks of pregnancy and decreases significantly as the pregnancy progresses. Once a heartbeat is detected (typically around 6-8 weeks), the risk drops considerably. After the first trimester (around 12-13 weeks), the risk becomes very low.
  3. Previous Miscarriages: While one miscarriage doesn't necessarily mean you'll have another, the risk does slightly increase with each subsequent miscarriage.
    • After 1 miscarriage: Risk is similar to someone with no history.
    • After 2 consecutive miscarriages: Risk increases slightly (e.g., to 20-25%).
    • After 3 or more consecutive miscarriages: Risk increases further (e.g., to 30-45%).
  4. Chromosomal Abnormalities: The most common cause of miscarriage (accounting for 50-70% of cases) is a problem with the baby's chromosomes. These are random errors that occur during cell division and are usually not inherited.
  5. Uterine or Cervical Problems: Structural issues with the uterus (e.g., fibroids, septum) or a weakened cervix can contribute to miscarriage.
  6. Chronic Medical Conditions: Uncontrolled diabetes, severe thyroid disease, certain autoimmune disorders (like lupus), and polycystic ovary syndrome (PCOS) can increase risk.
  7. Infections: Certain infections can lead to miscarriage.
  8. Lifestyle Factors: Smoking, heavy alcohol consumption, and illicit drug use are known to increase miscarriage risk. High caffeine intake might also play a role, though evidence is mixed.
  9. Weight: Both being significantly underweight or overweight can be associated with a higher risk.

What This Calculator Does and Doesn't Do:

This Miscarriage Risk Estimator provides a statistical approximation based on your age, current gestational week, and history of previous miscarriages. It uses general population data to give you an idea of the statistical likelihood. However, it cannot account for all individual health conditions, genetic factors, or lifestyle choices that may influence your personal risk. It is designed for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment.

When to Seek Medical Advice:

If you are pregnant and experience any concerning symptoms such as vaginal bleeding, severe abdominal pain, or loss of pregnancy symptoms, contact your healthcare provider immediately. They can provide an accurate diagnosis and appropriate care.

Examples of Miscarriage Risk Calculation:

Let's look at a few scenarios using the logic of this calculator:

  1. Scenario 1: Young, Early Pregnancy, No History
    • Age: 28 years
    • Gestational Week: 5 weeks
    • Previous Miscarriages: 0
    • Estimated Risk: Around 14-18%
    • Explanation: While age is low, the very early gestational week significantly increases the initial risk.
  2. Scenario 2: Older, Mid-First Trimester, No History
    • Age: 38 years
    • Gestational Week: 10 weeks
    • Previous Miscarriages: 0
    • Estimated Risk: Around 18-22%
    • Explanation: Higher age increases the base risk, but being further along in the first trimester (after a heartbeat is likely detected) helps to lower the overall percentage compared to earlier weeks.
  3. Scenario 3: Moderate Age, Late First Trimester, History of Miscarriages
    • Age: 32 years
    • Gestational Week: 12 weeks
    • Previous Miscarriages: 2
    • Estimated Risk: Around 11-15%
    • Explanation: While the previous miscarriages add to the risk, reaching the end of the first trimester significantly reduces the overall probability, bringing it into a moderate range.

Remember, these are statistical estimations. Every pregnancy is unique, and individual circumstances can vary widely. Always consult with your healthcare provider for personalized advice.

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