Infusion Concentration and Dose Rate
Convert a dose-per-time prescription into a volume-per-time pump rate.
How to prepare for the NMC Midwifery CBT
Combine unit-safe calculation with newly qualified midwife judgement grounded in the Code, informed choice, continuity, physiology, timely escalation and collaborative care.
Core concepts
Concept 1
First establish the prepared concentration, then convert required dose rate to volume rate.
Exam cue: Separate dose rate from volume rate.
Concept 2
Maternal weight may affect the dose rate before concentration conversion.
Exam cue: Carry weight and time units explicitly.
Risk pitfalls and guardrails
Using total bag dose as a per-mL concentration.
Guardrail: Do not choose a familiar task if it ignores deterioration, consent, medicines risk, scope, communication or follow-up.
Omitting the time conversion.
Guardrail: Do not choose a familiar task if it ignores deterioration, consent, medicines risk, scope, communication or follow-up.
Memory anchors
What is prepared concentration?
Total drug amount ÷ total prepared volume.
How is volume rate found?
Required dose rate ÷ concentration.
When is weight used?
When the prescription is expressed per kilogram.
Why keep time units visible?
Per-minute and per-hour rates differ sixty-fold.
What closes the calculation?
Check concentration, pump rate and total delivered dose.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A bag contains 10 units in 500 mL. The prescription requests 2 units/hour. What volume rate delivers that dose?
An infusion is prepared with 4 g in 50 mL. The prescribed dose rate is 1 g/hour. What pump rate is required?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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