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CTG Interpretation Calculator (FIGO 2015)

Standardized Cardiotocography classification tool using FIGO 2015 criteria. Helps clinicians categorize fetal heart rates as Normal, Suspicious, or Pathological.

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Category Women\'s Health
Baseline Rate (bpm)
Baseline Variability
Decelerations
Accelerations
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About

Intrapartum fetal monitoring is crucial for detecting fetal hypoxia and acidosis. However, visual interpretation of Cardiotocography (CTG) traces is notoriously subjective, leading to high inter-observer variability. This decision support tool standardizes the assessment process by applying the 2015 Guidelines from the International Federation of Gynecology and Obstetrics (FIGO).

The classification system aggregates four key parameters-Baseline, Variability, Decelerations, and Accelerations-to categorize the trace as Normal, Suspicious, or Pathological. This objective structured approach aids in reducing unnecessary interventions while ensuring timely action for compromised fetuses.

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Formulas

The FIGO consensus guideline utilizes a tiered logic system. The final classification is determined by the "worst" feature present.

{
Pathological if Any Pathological featureSuspicious if Any Suspicious feature AND No PathologicalNormal if All features are Normal

Reference Data

ParameterNormalSuspicious (1 or more)Pathological (1 or more)
Baseline (bpm)110 - 160100-110
160-180		< 100
> 180 (Sinusoidal)
Variability (ms)5 - 25< 5 for < 50 min
> 25 for > 25 min		< 5 for > 50 min
Sinusoidal pattern
DecelerationsNone or EarlyRepetitive variable
Repetitive late (< 50% of contractions)		Repetitive late (> 30 min)
Prolonged (> 5 min)
OutcomeGREENYELLOWRED

Frequently Asked Questions

A suspicious trace lacks pathological features but falls outside the definition of normal. It requires correction of reversible causes (e.g., hypotension, hyperstimulation) and close monitoring.
A sinusoidal pattern (smooth, wave-like, 3-5 cycles/min, lasting >20 mins) is automatically flagged as Pathological, regardless of other parameters, as it indicates severe fetal anemia or hypoxia.
No. This calculator is a decision support system. Clinical context (e.g., meconium, temperature, stage of labor) must always influence the final management plan.
The absence of accelerations in labor is of uncertain significance and does not necessarily indicate hypoxia if variability is normal. However, their presence is a reassuring sign of non-acidosis.