Tool Introduction
The Fetal Cerebroplacental Ratio (CPR) is an important indicator for assessing fetal health, especially with significant clinical value in monitoring fetal intrauterine hypoxia and growth restriction. This online tool aims to help users quickly calculate and interpret CPR values, assessing whether the fetal current state is “Normal” or “Attention Intrauterine Hypoxia” based on the input CPR value, and providing a reference “Normal Range” to offer convenient auxiliary information for pregnancy monitoring.
Cerebroplacental Ratio CPR Introduction
The Cerebroplacental Ratio (CPR) is a ratio calculated by detecting the Pulsatility Index (PI) of the fetal Middle Cerebral Artery (MCA) and the Pulsatility Index (PI) of the Umbilical Artery (UA) via ultrasound Doppler (CPR = MCA PI / UA PI). This indicator reflects the redistribution of fetal blood flow between the brain and the placenta. When the fetus is in a hypoxic state, to protect vital organs (such as the brain), blood flow is preferentially supplied to the brain, leading to reduced resistance in the middle cerebral artery (decreased PI value), while umbilical artery resistance may increase or remain unchanged, thereby lowering the CPR value. Therefore, CPR is considered one of the sensitive indicators for predicting fetal distress, adverse pregnancy outcomes, and fetal growth restriction.
Clinical Significance of CPR Calculation
CPR has important clinical significance in prenatal monitoring:
- Early Warning: A decrease in CPR often precedes manifestations such as fetal growth restriction, oligohydramnios, or abnormal fetal heart monitoring, serving as an early warning signal for fetal intrauterine hypoxia.
- Assessing Fetal Distress: Persistently low CPR suggests the fetus may have chronic hypoxia or acute distress, requiring closer monitoring and intervention.
- Guiding Clinical Decisions: By combining CPR values with other monitoring indicators, doctors can more accurately assess fetal safety and decide whether early delivery or enhanced monitoring is needed.
- Predicting Adverse Outcomes: Abnormal CPR is associated with an increased risk of neonatal complications (such as acidosis, NICU admission, perinatal death, etc.).
How to Use
- In the “CPR” input box, enter the Fetal Cerebroplacental Ratio (CPR) value obtained from your ultrasound examination. This value should be a pure number.
- Click the “Execute” button below the tool (if present; this configuration information does not explicitly provide a button, but calculation usually needs to be triggered).
- The tool will immediately display the calculation results, including “Fetal Status” and “Normal Range”.
Input Parameter Requirements:
- CPR: Required field, requires entering a pure number, for example:
1.2, 0.95.
Output Result Format:
Results will be presented in a list format, including the following two items:
- Fetal Status: Displays “Normal” or “Attention Intrauterine Hypoxia”, accompanied by corresponding color badges (green for normal, yellow for attention).
- Normal Range: Provides the reference normal range for CPR.
Frequently Asked Questions
- Q: What is the Fetal Cerebroplacental Ratio (CPR)?
- A: CPR is the ratio of the fetal Middle Cerebral Artery Pulsatility Index (MCA PI) to the Umbilical Artery Pulsatility Index (UA PI). It reflects the redistribution of fetal blood flow between the brain and the placenta and is an important indicator for assessing fetal intrauterine hypoxia and health status.
- Q: What are the requirements for entering the CPR value?
- A: The input value must be a pure number, representing the CPR value obtained through ultrasound Doppler detection. This tool does not have specific numerical range limits, but it is recommended to enter real medical measurement data.
- Q: How does the tool determine “Normal” or “Attention Intrauterine Hypoxia”?
- A: This tool makes judgments based on internal algorithms and clinical reference thresholds. Typically, when the CPR value is below a certain threshold (e.g., 1.08; the specific threshold may vary depending on gestational week and research), it will be determined by the system as “Attention Intrauterine Hypoxia”, requiring attention.
- Q: Can this calculator replace a doctor's diagnosis?
- A: No. This tool only provides auxiliary calculations and information reference. All medical diagnoses and treatment decisions must be made by professional medical personnel based on comprehensive clinical evaluations and examination results.
Important Notes
- The calculation results of this tool are for reference only and cannot be used as the sole basis for diagnosis or medical advice.
- The entered CPR value must be accurate; otherwise, it will affect the accuracy of the results. Please ensure that the input is a value measured by professional medical equipment.
- Fetal health is influenced by multiple factors, and the CPR value is only one important indicator. When interpreting the results, it is essential to combine them with other clinical manifestations, ultrasound examination results, and the doctor's professional judgment.
- If this tool displays “Attention Intrauterine Hypoxia”, please consult your obstetrician promptly for further examination and evaluation.
- This tool does not store any user input data.
