Highlights
Task:
Slope Intercept
Given the absorbance in the table below calculate the concentration of the patient and quality control rounded to three significant figures and show your workings of the calculation.
Sample Absorbance at 490 nm Concentration Units
Patient
0.78250
Quality Control
0.39250
839470119761000Your laboratory group tested a patient’s blood sample for creatinine concentration. When comparing the value you obtained for the patient’s creatinine value with other laboratory groups you find your value is much higher. Suggest three possible analytical errors that may have led to this happening.(6 marks)
Question 2.
Figure 1 demonstrates the points at which the reference range is set for a particular test as indicated by the solid black markers and the double headed arrow.
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Figure 1. Reference range set to +/- 2SD of the mean value for the analyteDiscuss the consequence of moving the upper reference limit from where it is in figure 1 to its new position in figure 2, for patients having this test.
(10 marks)
1913254177935
Figure 2. Reference range with the upper limit set at >3SD from the mean value
Now discuss the consequences of moving the upper reference limit from where it was in figure 1 to its new position in figure 3, for patients having this test.(10 marks)
1371600180003
Figure 3. Reference range with the upper limit now set at <3SD from the mean value found in the population with disease
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