A 4-year-old child who weighs 41.8\text{ lb} is brought to the pediatric clinic with acute… — NCLEX-PN

A 4-year-old child who weighs $41.8\text{ lb}$ is brought to the pediatric clinic with acute otitis media. The healthcare provider prescribes cefdinir oral suspension $14\text{ mg/kg/day}$ to be given in two equally divided doses. The dispensed medication bottle indicates that adding $38\text{ mL}$ of distilled water will yield a final reconstituted concentration of $250\text{ mg}/5\text{ mL}$ . How many $\text{mL}$ will the nurse administer for a single dose? (Record answer to the nearest tenth. Do not include units in answer.)

Answer: 2.7 mL

Answer

2.7

To determine the correct volume to administer, first convert the client's weight to kilograms (

41.8\text{ lb} \div 2.2 = 19\text{ kg}

). Next, find the total daily dose by multiplying the weight by the prescribed rate (

19\text{ kg} \times 14\text{ mg/kg} = 266\text{ mg}

). Since this medication is given in two equally divided doses, divide by 2 to get the single dose amount (

266\text{ mg} \div 2 = 133\text{ mg}

). Finally, use the reconstituted concentration of

250\text{ mg}

5\text{ mL}

to find the volume to administer:

(133\text{ mg} \div 250\text{ mg}) \times 5\text{ mL} = 2.66\text{ mL}

. Rounding to the nearest tenth yields

2.7\text{ mL}

. Note that the

38\text{ mL}

of water mentioned is the diluent used to prepare the medication and is extraneous information designed to test critical reading skills.

Step-by-Step Solution

Convert weight to kilograms

19\text{ kg}

The medication dosage is prescribed based on the client's metric weight (mg/kg).

Determine total daily dose

266\text{ mg/day}

The prescription calls for 14 mg per kg per day.

Calculate the single dose

133\text{ mg/dose}

The total daily medication is to be divided into two equal doses.

Calculate the required volume based on concentration

2.66\text{ mL}

The final reconstituted medication concentration is 250 mg per 5 mL.

Round to nearest tenth

2.7

Clinical rounding rules and the question instructions require rounding to the nearest tenth.

Key Concept

Pediatric weight-based dosage calculation and identifying relevant reconstitution data.

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