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1Formulas and methods
Nursing assistant (CNA) knowledge
Method
Check whether the resident is in danger right now (not breathing, choking, a fall, chest pain, stroke signs); if so, keep them safe and get the nurse at once.
Ask whether the task is within the nursing assistant’s scope and training; if not, decline politely and tell the nurse.
Respect the resident’s rights: privacy, choice, refusal of care, dignity and freedom from abuse and unneeded restraints.
Apply the basic rules: hand hygiene, body mechanics, bed low and call light within reach, weak side first when dressing.
Observe and report: compare with the resident’s usual state and report changes promptly and objectively.
Nursing math & unit conversions
Metric steps
1 kg = 1000 g, 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL
Weight and length
1 kg = 2.2 lb, 1 lb = 16 oz, 1 in = 2.54 cm, 1 ft = 12 in
Household measures
1 tsp = 5 mL, 1 tbsp = 15 mL, 1 fl oz = 30 mL, 1 cup = 8 fl oz = 240 mL
Write the given quantity with its unit and the unit you want.
Pick the equivalent: 1000 between kg, g, mg and mcg or L and mL; 1 kg = 2.2 lb; 1 tsp = 5 mL, 1 tbsp = 15 mL, 1 fl oz = 30 mL, 1 cup = 240 mL.
Write it as a fraction so that the unwanted unit cancels; for a rate, use one fraction per unit that changes.
Check the direction: a smaller unit gives a bigger number.
Round only the final answer, to the precision the question names.
2Practice problems
1.Nursing assistant (CNA) knowledgeMedium
A resident is on contact precautions for MRSA. How should the blood pressure cuff and stethoscope be handled?
AUse the hallway cuff on every resident in turn
BShare the cuff with the roommate without cleaning it
CUse equipment that stays in that resident's room
DWipe the cuff with plain water and take it to the next room
2.Nursing assistant (CNA) knowledgeHard
A resident has just walked back from physical therapy. The care plan asks for a resting blood pressure. What should the nursing assistant do?
AMeasure it on the leg so the arm can rest
BSkip the reading and copy yesterday's value
CMeasure it at once while the resident is still standing in the doorway
DLet the resident sit and rest for about 5 minutes before measuring
3.Nursing math & unit conversionsMedium
Practice exercise (made-up values, not clinical guidance). A patient’s temperature is 98.5 °F. Convert it to degrees Celsius T with °C = (°F − 32) × 5/9. Round to one decimal place.
98.5 °F
T = °C
4.Nursing math & unit conversionsHard
Practice exercise (made-up values, not clinical guidance). An infusion delivers 8 mg/h. Express this dose rate D in mcg/min. Round to one decimal place.
8 mg/h1 mg = 1000 mcg1 h = 60 min
D = mcg/min
3Solutions
1.Nursing assistant (CNA) knowledge
Answer: C · Use equipment that stays in that resident's room
Why this is the answer
In contact precautions, dedicated equipment stays in the resident's room. If an item must be shared, it is cleaned and disinfected before it is used for another resident.
Answer
C · Use equipment that stays in that resident's room
2.Nursing assistant (CNA) knowledge
Answer: D · Let the resident sit and rest for about 5 minutes before measuring
Why this is the answer
Activity raises blood pressure, so the resident rests quietly, seated with the arm supported, for about 5 minutes first. Copying an old value is falsification.
Answer
D · Let the resident sit and rest for about 5 minutes before measuring
3.Nursing math & unit conversions
Answer: T = 36.9 °C
Temperature: °C = (°F − 32) × 5/9 and °F = °C × 9/5 + 32. Subtract 32 before you multiply when going from °F, and add 32 after you multiply when going from °C. A quick check: 37 °C is 98.6 °F, and every 1 °C is 1.8 °F.
Subtract 32
98.5 − 32 = 66.5
Multiply by 5/9
T = 66.5·5/9 = 36.94 ≈ 36.9 °C
Answer
T = 36.9 °C
4.Nursing math & unit conversions
Answer: D = 133.3 mcg/min
Dimensional analysis: write the given quantity, then multiply by conversion factors written as fractions (for example 60 min/1 h or 1 mg/1000 mcg) so that each unwanted unit appears once on top and once underneath and cancels. When only the wanted unit is left, calculate. Use the equivalents the question gives and round only the final answer.
Set up the chain
D = 8 mg/h × (1000 mcg/1 mg) × (1 h/60 min)
Calculate
D = 8000/60 = 133.3 mcg/min
Answer
D = 133.3 mcg/min
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