This topic contains a solution. Click here to go to the answer

Author Question: A clinical laboratory scientist performs 30 replicate hemoglobin determinations on a single blood ... (Read 91 times)

Anajune7

  • Hero Member
  • *****
  • Posts: 574
A clinical laboratory scientist performs 30 replicate hemoglobin determinations on a single blood sample. When statistics are used to determine the precision of the method, the mean is 13.8 g/dL and 1 SD is 0.1 g/dL.
 
  This means that 95.5 of the results on this specimen lie:
 
  a. Between 13.4 and 14.2 g/dL
  b. Between 13.6 and 14.0 g/dL
  c. Between 13.5 and 14.1 g/dL
  d. Between 13.7 and 13.9 g/dL

Question 2

The following hemoglobin results, reported in g/dL, are obtained on a hospitalized patient on 3 consecutive days:
 
  Day 1 Day 2 Day 3
   14.3 11.5 14.4
 
  The SD for this hemoglobin method was calculated in Question 18. A delta check was obtained on day 2. Controls were run as appropriate each day and were all within limits for this procedure.
 
  What is the most probable reason for the day 2 result when compared with those for days 1 and 3?
 
  a. It is within the 95.5 confidence levels for this test.
  b. It may represent an error in patient identification.
  c. The patient had a major blood loss between days 1 and 2.
  d. It is within the 99 confidence levels for this test.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

janeli1

  • Sr. Member
  • ****
  • Posts: 330
Answer to Question 1

ANS: B
Because 1 SD is 0.1 g/dL, 2 SD = 0.2 g/dL. Thus 95.5 of the results lie between 13.6 (2 SDs) and 14.0 (+2 SDs).

Answer to Question 2

ANS: B
The results for days 1 and 3 are statistically the same result (i.e., they are within the 95.5 confidence levels for this procedure and are therefore precise). The result for day 2 is clearly very significantly different, thus giving a delta check (the only possible explanation of those given here is that a patient identification error occurred and the specimen on day 2 is from a different patient). Delta checks are designed to help pick up this kind of critical error. If it had been within the 99 confidence limits, then it would have been within 3 SDs or no less than 14.0 g/dL. Because the results from day 1 and day 3 are the same, blood loss with a drop in hemoglobin cannot explain the day 2 results.




Anajune7

  • Member
  • Posts: 574
Reply 2 on: Jun 25, 2018
Thanks for the timely response, appreciate it


milbourne11

  • Member
  • Posts: 322
Reply 3 on: Yesterday
:D TYSM

 

Did you know?

In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.

Did you know?

The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.

Did you know?

Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Did you know?

The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

Did you know?

Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

For a complete list of videos, visit our video library