NORCET 3 - 2022 (Shift-1)
Nursing Foundation
Medium
A doctor prescribe a medicine 20 mcg BID and available dose is 30 mcg/15 ml. Calculate the morning single dose?
Appeared in: NORCET 3 - 2022 (Shift-1)
Explanation
- The question requires calculating a single dose of medication from an available solution.
- The prescription is '20 mcg BID', where BID (bis in die) means twice a day. This confirms that 20 mcg is the amount for one single dose.
- The standard formula for dose calculation is: Volume = (Desired Dose / Available Dose) × Available Volume.
- Plugging in the values: Volume = (20 mcg / 30 mcg) × 15 ml.
- Solving the equation: (2/3) × 15 = 10 ml. Thus, 10 ml of the solution is needed to deliver the prescribed 20 mcg dose.
Why Other Options Were Wrong
- Option B: Administering 15 ml would deliver 30 mcg of the medication, which is the entire amount in the vial and exceeds the prescribed single dose of 20 mcg.
- Option C: Administering 25 ml would deliver 50 mcg of the medication. This is calculated as (30 mcg / 15 ml) × 25 ml = 50 mcg, which is significantly higher than the ordered dose.
- Option D: Administering 20 ml would deliver 40 mcg of the medication. This is calculated as (30 mcg / 15 ml) × 20 ml = 40 mcg, which is double the prescribed dose.
Related Visual
- Visual 1: Infographic - A clear visual breakdown of the drug calculation formula: (Desired Dose / Dose on Hand) x Quantity = Amount to Administer. This helps in memorizing and applying the formula correctly.
- Visual 2: Chart - A chart explaining common medical abbreviations for medication frequency, such as BID (twice a day), TID (three times a day), QID (four times a day), and OD (once a day).
Clinical Relevance
- Nursing practice connection: Knowing Medication Dose Calculation helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
- Accurate medication calculation is a fundamental nursing skill critical for patient safety. Errors can lead to underdosing (ineffective treatment) or overdosing (toxicity).
- This skill is a core component of the 'Five Rights of Medication Administration': Right Patient, Right Drug, Right Dose, Right Route, and Right Time.
- What if the prescription was '20 mcg daily' instead of BID? The calculation for a single dose would remain the same (10 ml), but it would only be administered once per day.
How to Approach the Question
- First, identify the key pieces of information provided: the desired dose, the available dose, and the available volume.
- Note the desired dose is '20 mcg'. The term 'BID' indicates the frequency (twice a day) but doesn't change the amount for a single dose.
- Identify the available concentration: '30 mcg/15 ml'. This is your 'Dose on Hand' (30 mcg) and 'Quantity' (15 ml).
- Apply the universal formula for drug calculation: (Desired / Have) × Quantity.
- Substitute the values: (20 mcg / 30 mcg) × 15 ml.
- Perform the mathematical calculation to find the correct volume in ml and compare your result with the given options.
Concept Tested & Keywords
- Concept Tested: Medication Dose Calculation
- Stem keywords: prescribe, medicine, 20 mcg, BID, available dose, 30 mcg/15 ml, calculate, morning single dose
- Lead-in keywords: Calculate
- Negative lead-in flag: false
Question ID
QJ_qRlLcr-p1r3umDe6bgQ
Practise the full NORCET 3 - 2022 (Shift-1)
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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