Dose, Strength and Quantity
Convert a prescribed dose and stock strength into the amount to administer.
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
Use required dose divided by stock dose, multiplied by the stock quantity, after aligning units.
Exam cue: Write the required and available doses first.
Concept 2
The final number must represent the amount administered rather than an intermediate conversion.
Exam cue: Name the requested output unit before calculating.
Risk pitfalls and guardrails
Reversing required and stock dose.
Guardrail: Do not choose a familiar task if it ignores deterioration, consent, medicines risk, scope, communication or follow-up.
Entering a mass when the question asks for tablets or volume.
Guardrail: Do not choose a familiar task if it ignores deterioration, consent, medicines risk, scope, communication or follow-up.
Memory anchors
What is the core dose formula?
Required dose ÷ stock dose × stock quantity.
What precedes the formula?
Convert required and stock doses to the same unit.
What is stock quantity?
The tablet count or volume containing the labelled stock dose.
What should the final unit describe?
The amount actually administered.
What is the final check?
Direction, unit, magnitude and clinical plausibility.
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 prescription requests 750 mg of a medicine. Each tablet contains 250 mg. How many tablets are required?
A liquid contains 200 mg in 5 mL. The prescribed dose is 600 mg. What volume 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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