Labour · Induction
Oxytocin Titration
Oxytocin titration for labour induction and augmentation. Low-dose and high-dose protocols per ACOG PB 107 and NICE NG207, with tachysystole management.
Last reviewed 26 May 2026
Oxytocin induction / augmentation
Low-dose vs high-dose titration
Protocol
Starting rate
1 mU/min
Increment
+1 every 30 min
Typical max
20 mU/min
absolute 30
Next-step suggestion
Start at 1 mU/min via infusion pump.
Tachysystole and reassuring vs non-reassuring
- Tachysystole = > 5 contractions in 10 min averaged over 30 min, OR contractions > 90 s.
- Reassuring trace + tachysystole: reduce by 1–2 mU/min, lateral position, IV bolus.
- Non-reassuring trace + tachysystole: STOP infusion, position change, IV fluid bolus, O2, consider terbutaline 250 mcg SC.
- Adequate activity = 3–5 contractions / 10 min, 40–60 s duration, ≥ 200 Montevideo units on IUPC.
Educational tool only — not medical advice. ACOG PB 107 (2009 reaffirmed 2023); NICE NG207. Local protocols vary considerably; this widget shows the common ranges. Decisions on starting, titrating, holding, or stopping oxytocin are made by your obstetric team with continuous CTG and clinical assessment.
What does this mean?
Oxytocin is the workhorse drug of labour induction and augmentation. It mimics the natural pituitary hormone that drives uterine contractions. The half-life is short (~3– 6 min) so steady-state is reached after about 30–40 minutes — which is why low-dose protocols increase at 30-min intervals. Low-dose (start 1–2 mU/min, increase 1–2 q30min) is the global default and has lower tachysystole rates. High-dose (start 4–6 mU/min, increase 4–6 q15min) shortens time to delivery by 1–2 hours on average but increases tachysystole and Cat-II/III tracings without changing long-term outcomes (Cochrane 2014). Most US units (Mayo, MFMU) use low-dose; some UK and Northern European centres use a faster ramp. The key safety principle: titrate to adequate activity (3–5 contractions/ 10 min, ≥ 200 Montevideo units), not maximum dose. Tachysystole + non-reassuring trace = STOP-position-fluids-tocolysis pathway.
Introduction
Oxytocin is the most-used drug in modern labour wards — given for induction in approximately 25 % of US deliveries and used to augment slow or stalled labour in many more. This calculator shows the low-dose and high-dose protocol parameters and supports a next-step titration suggestion against the current rate.
Protocol parameters
- Low-dose: start 1–2 mU/min, +1–2 mU q30min, typical max 20, absolute max 30 mU/min.
- High-dose: start 4–6 mU/min, +4–6 mU q15min, typical max 30, absolute max 40 mU/min.
Preparation
Standard: 30 IU oxytocin in 500 mL compatible IV fluid = 60 mU/mL. At this concentration, mL/h equals mU/min numerically.
Tachysystole management
- Reassuring FHR + tachysystole: reduce 1–2 mU/min, position, IV bolus.
- Non-reassuring FHR: STOP, position change, IV bolus, oxygen, terbutaline 250 mcg SC.
Limitations
- Educational tool only — not a prescribing aid.
- Local protocols vary; cross-check with your unit’s smart-pump library.
- Continuous CTG monitoring is mandatory throughout oxytocin infusion.
- VBAC patients need extra caution — lower starting dose, slower titration, maintain low threshold for surgical delivery if rupture suspected.
Sources
- ACOG Practice Bulletin 107. Induction of Labor. 2009 reaffirmed 2023.
- NICE NG207. Inducing Labour. 2021, updated 2023.
- Budden A, et al. High-dose versus low-dose oxytocin infusion regimens for induction of labour at term. Cochrane Database Syst Rev 2014.
- Crane JM. Factors predicting labor induction success: a critical analysis. Clin Obstet Gynecol 2006.
- ACOG / SMFM Obstetric Care Consensus #1. Safe Prevention of the Primary Cesarean Delivery. 2014.
Frequently asked questions
What is oxytocin used for in labour?
Two main uses: (1) INDUCTION — starting labour when delivery is medically advisable (post-term, PPROM, GDM, pre-eclampsia, FGR, etc.) and the cervix is reasonably ripe (Bishop ≥ 8 or post-cervical ripening). (2) AUGMENTATION — speeding up established labour that has slowed or arrested. Oxytocin mimics the natural pituitary hormone that drives uterine contractions, with a short half-life (3–6 min) allowing rapid titration.
What's the difference between low-dose and high-dose protocols?
LOW-DOSE: start 1–2 mU/min, increase by 1–2 mU/min every 30 min, typical max 20 mU/min, absolute max ~30. HIGH-DOSE: start 4–6 mU/min, increase by 4–6 every 15 min, typical max 30–40 mU/min. Cochrane 2014 meta-analyses showed high-dose shortens labour by ~1–2 hours but increases tachysystole and Category II/III FHR tracings, without improving CS rates or neonatal outcomes. Most US centres (MFMU) use low-dose; some UK and Scandinavian units favour high-dose.
How is the infusion prepared?
Standard preparation is 30 IU oxytocin in 500 mL of compatible IV fluid (Ringer's lactate or normal saline) = 60 mU/mL. At this concentration, mL/h equals mU/min (e.g. 8 mU/min = 8 mL/h). An older preparation of 10 IU in 1000 mL = 10 mU/mL requires 6 × the mL/h (e.g. 8 mU/min = 48 mL/h). Always verify against your unit's smart-pump library — wrong concentration is the most common dosing error.
What is 'adequate' uterine activity?
3–5 contractions in 10 minutes lasting 40–60 seconds each, palpably strong. Quantitatively, ≥ 200 Montevideo Units (MVU) measured by intrauterine pressure catheter (IUPC) over 10 minutes. Active-phase arrest is defined (ACOG-SMFM OCC #1 2014) as ≥ 6 cm dilation + ruptured membranes + 4–6 hours of adequate contractions with no cervical change.
What is tachysystole and how is it managed?
Tachysystole = > 5 contractions in 10 minutes averaged over 30 min, OR contractions lasting > 90 seconds. Management depends on the FHR tracing: REASSURING + tachysystole — reduce oxytocin by 1–2 mU/min, lateral position, IV fluid bolus. NON-REASSURING (Category II/III) + tachysystole — STOP oxytocin, position change, IV fluid bolus, supplemental O₂, consider terbutaline 250 mcg SC for uterine relaxation. Continuous CTG is the safety backstop.
When should oxytocin be stopped or paused?
(1) Category III FHR tracing. (2) Tachysystole with non-reassuring trace. (3) Adequate uterine activity achieved (turn down or hold). (4) Suspected uterine rupture (acute pain, loss of contractions, FHR deterioration — particularly in VBAC). (5) Water intoxication / hyponatraemia (oxytocin has ADH-like activity at high doses). (6) Maternal request after counselling about implications.
Are there contraindications to oxytocin induction?
Absolute: vasa previa, placenta previa, transverse lie, prior classical CS, active genital herpes, prior myomectomy entering cavity, fetal distress. Relative: prior low-transverse CS (TOLAC — discuss with team, lower starting dose, slower titration), grand multiparity (rupture risk), polyhydramnios with malpresentation, severe maternal cardiac disease. The decision is individualised.
How does this relate to other calculators on BumpBites?
BumpBites companion tools: /calculators/bishop-score for cervical favourability before induction; /calculators/friedman-labor for active-phase arrest definitions; /calculators/ctg-categorization for managing FHR changes; /calculators/vbac-success for the special considerations in TOLAC oxytocin use.