How to Document Uterine Contractions on Obstetric Examination
Document uterine contractions by recording their frequency (number per 10 minutes), duration (in seconds), and intensity (mild/moderate/strong by palpation), assessed over a 30-minute period.
Standard Documentation Format
When writing contractions in examination findings, use this structured approach:
- Frequency: Count contractions per 10-minute window, averaged over 30 minutes
- Duration: Time each contraction from start to finish (typically 45-90 seconds)
- Intensity: Assess by palpation as:
- Mild (uterus indents easily)
- Moderate (uterus indents with difficulty)
- Strong (uterus does not indent, feels firm)
- Relaxation time: Document the interval between contractions
Example Documentation
"Contractions: 4 in 10 minutes, lasting 60 seconds, moderate intensity, with 2-3 minute relaxation intervals"
or
"UC: 3-4/10 min, 50-70 sec duration, strong by palpation"
Assessment Methods
External palpation remains the most practical bedside method 1. While it provides reliable information about frequency and duration, it cannot accurately quantify contraction amplitude 2. The evidence shows that palpation is inexpensive and harmless but requires trained observation 1.
Alternative Methods (When Indicated)
- External tocodynamometry: Most widely used for continuous monitoring; provides accurate frequency and duration but not amplitude 1, 3
- Intrauterine pressure catheter (IUPC): Quantifies contractions in Montevideo Units (sum of contraction amplitudes in mmHg over 10 minutes; normal ≥200 units) 2. However, this invasive method has limited clinical utility in most situations 1
Clinical Context
Contraction assessment has limited value for determining labor phase 2. Contractions inconsistently increase in intensity, frequency, and duration throughout the first stage, with no abrupt change marking the active phase 2. The cervical dilatation pattern is more reliable for identifying labor progress 2.
Key Parameters to Monitor
The relaxation time is the most critical parameter for fetal well-being 4. Almost all abnormal contraction patterns involve shortened relaxation time and can lead to fetal compromise 4.
Normal upper limit: 4-5 contractions per 10 minutes averaged over 30 minutes. Recent evidence suggests 4 contractions per 10 minutes may be a safer threshold than the traditional 5, as it enables earlier detection of potentially compromised fetuses 5.
Common Pitfalls
- Obesity: External methods (palpation and tocodynamometry) may be unreliable; consider IUPC if critical decisions depend on contraction assessment 1
- Over-reliance on Montevideo Units: While objective, these measurements don't consistently improve outcomes and have broad variability in normal labor 2
- Ignoring relaxation time: Focus only on frequency/duration misses a critical parameter for fetal safety 4