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Review Question - QID 103979

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QID 103979 (Type "103979" in App Search)
On morning labs, a patient's potassium comes back at 5.9 mEq/L. The attending thinks that this result is spurious, and asks the team to repeat the electrolytes. Inadvertently, the medical student, intern, and resident all repeat the electrolytes that same morning. The following values are reported: 4.3 mEq/L, 4.2 mEq/L, and 4.2 mEq/L. What is the median potassium value for that patient that day including the first value?

4.2 mEq/L

13%

17/132

4.25 mEq/L

72%

95/132

4.3 mEq/L

1%

1/132

4.65 mEq/L

7%

9/132

1.7 mEq/L

2%

2/132

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The median is value of the 50th percentile. If there are an even number of values considered (4 in this case), the median is the average of the values on either side of the 50th percentile (i.e., 4.2 and 4.3), in this case 4.25 mEq/L.

Statistical distributions can be described in terms of mean, median, mode, range, and standard deviation. The mean is the average of the recorded values ([sum of all observations]/[sample size]). The median is the value of the 50th percentile. For a sample size of n where n is odd, the median is the [(n+1)/2]th largest value. When n is even, the median is the average of the (n/2)th and ((n/2)+1)th largest values. The mode is the value that appears the most frequently. The range is the difference of the largest and smallest values. The standard deviation speaks to dispersion from the mean.

Incorrect Answers:
Answer 1: 4.2 mEq/L is the mode.

Answer 3: 4.3 mEq/L is not the median.

Answer 4: 4.65 mEq/L is the mean.

Answer 5: 1.7 mEq/L is the range.

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