One ml is equivalent to macro drops

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2023

Explanation

Intravenous (IV) administration sets are categorized by their drop factor, which is the number of drops (gtt) it takes to deliver 1 mL of fluid.
Macrodrip tubing is designed for delivering large volumes of fluid rapidly.
Standard macrodrip sets are manufactured with drop factors of 10, 15, or 20 gtt/mL.
Among the given choices, 15 is a standard and common drop factor for macrodrip tubing.

Option B: 25 gtt/mL is not a standard drop factor for either macrodrip or microdrip IV administration sets.
Option C: 35 gtt/mL is not a standard calibration for any commercially available IV tubing.
Option D: 55 gtt/mL is not a standard drop factor. The only standard factor close to this number is 60 gtt/mL, which is for microdrip, not macrodrip, tubing.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain IV Administration Drop Factors as background academic context rather than a clinical decision trigger.
A nurse must always verify the drop factor on the IV tubing package before calculating the drip rate. Assuming a drop factor can lead to significant medication errors and adverse patient outcomes.
Using the wrong tubing (e.g., a macrodrip set when a microdrip is needed for a potent medication) can result in rapid overdose, while using a microdrip for a fluid bolus can delay life-saving treatment.
What if? If a patient requires a rapid fluid bolus of 1 liter over 1 hour and the nurse mistakenly uses a microdrip (60 gtt/mL) set instead of a macrodrip (15 gtt/mL) set, the flow rate would be difficult to regulate by gravity and may not achieve the intended rapid infusion, potentially worsening a condition like hypovolemic shock.

How to Approach the Question

First, identify the key terms in the question: 'One ml' and 'macro drops'. This points to a question about IV drop factors.
Recall the standard values for different types of IV administration sets.
Remember that 'macro' means large, so macrodrip sets deliver larger drops and thus fewer drops per mL compared to microdrip sets.
Recall the standard macrodrip factors: 10, 15, and 20 gtt/mL.
Compare these standard values to the options provided (15, 25, 35, 55).
Select the option that matches a standard macrodrip factor. In this case, only 15 is a standard value.

Concept Tested & Keywords

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E6 Pharmacology Nurses Shanbhag 3e p. 54-56

E6 Nursing Fundamentals Taylor p. 799-801

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