Saline lock (heplock) instead of continuous IV

IV access in place but not connected to a bag of fluids.

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What is it

A small IV catheter is placed in your hand or arm and capped off — ready for medication or fluids if needed, but without the pole and tubing. You can drink to thirst and move freely.

How your body works here

Being tethered to an IV pole discourages movement and position change (which shorten labor and help babies rotate). Continuous IV fluids also give the baby extra weight at birth, which then registers as bigger 'weight loss' in the first days — sometimes triggering unneeded supplementation. A saline lock keeps the medical access without those trade-offs.

Benefits (B)
Risks (R)
  • Not appropriate if you're actively receiving pitocin, magnesium, GBS antibiotics, or an epidural, all of which need continuous access.Review sources ↓
  • Some units default to continuous fluids by protocol; a written preference and a conversation with the nurse help.Review sources ↓
Alternatives (A)
Run BRAIN with Labor LensGet Benefits, Risks, Alternatives, Intuition, and Nothing/Wait for Saline lock (heplock) instead of continuous IV — plus questions for your care team.
Evidence summary

ACOG Committee Opinion 766 lists routine continuous IV fluids as an intervention that can be safely limited in uncomplicated labor. Restricting IV fluids does not worsen maternal or neonatal outcomes in the studies that have looked at it.

Sources
Questions to ask your provider
  • Can I have a saline lock instead of continuous fluids?
  • Under what circumstances would you want to switch to running fluids?
  • Can I drink and eat lightly as I feel like it?
Intuition & Nothing/Wait (the I and N in BRAIN)

What is your gut telling you? What happens if you do nothing or wait?

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After you talk it through

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