Baart et al developed a model for predicting a low hemoglobin concentration in a prospective donor. The authors are from Sanquin Blood Bank in Nijmegen and the University Center Utrecht in The Netherlands.
Parameters:
(1) gender
(2) hemoglobin at last previous visit in g/dL
(3) hemoglobin at the visit prior to the last previous
(4) deferral status and reason
(5) season of current donation attempt
(6) number of months since previous visit in months
(7) number of whole blood donations in the past 2 years
delta hemoglobin =
= (hemoglobin at last previous visit) - (hemoglobin at visit prior to last previous)
|
Gender |
Hemoglobin Last Visit |
Previous Deferral |
Points |
|---|---|---|---|
|
male |
6 |
none |
0 |
|
male |
6 |
low hemoglobin |
13 |
|
male |
6 |
other |
0 |
|
male |
7 |
none |
0 |
|
male |
7 |
low hemoglobin |
11 |
|
male |
7 |
other |
0 |
|
male |
8 |
none |
14 |
|
male |
8 |
low hemoglobin |
9 |
|
male |
8 |
other |
1 |
|
male |
9 |
none |
11 |
|
male |
9 |
low hemoglobin |
0 |
|
male |
9 |
other |
0 |
|
male |
10 |
none |
8 |
|
male |
10 |
low hemoglobin |
0 |
|
male |
10 |
other |
-1 |
|
male |
11 |
none |
5 |
|
male |
11 |
low hemoglobin |
0 |
|
male |
11 |
other |
-2 |
|
male |
12 |
none |
2 |
|
male |
12 |
low hemoglobin |
0 |
|
male |
12 |
other |
-3 |
|
female |
6 |
none |
0 |
|
female |
6 |
low hemoglobin |
13 |
|
female |
6 |
other |
0 |
|
female |
7 |
none |
0 |
|
female |
7 |
low hemoglobin |
11 |
|
female |
7 |
other |
0 |
|
female |
8 |
none |
15 |
|
female |
8 |
low hemoglobin |
9 |
|
female |
8 |
other |
1 |
|
female |
9 |
none |
12 |
|
female |
9 |
low hemoglobin |
0 |
|
female |
9 |
other |
0 |
|
female |
10 |
none |
9 |
|
female |
10 |
low hemoglobin |
0 |
|
female |
10 |
other |
-1 |
|
female |
11 |
none |
6 |
|
female |
11 |
low hemoglobin |
0 |
|
female |
11 |
other |
-2 |
|
female |
12 |
none |
3 |
|
female |
12 |
low hemoglobin |
0 |
|
female |
12 |
other |
-2 |
|
Parameter |
Finding |
Points |
|---|---|---|
|
delta hemoglobin |
-2.5 |
0 |
|
|
-1.5 |
1 |
|
|
-0.5 |
2 |
|
|
0.5 |
3 |
|
|
1.5 |
4 |
|
|
2.5 |
5 |
|
season of the year |
winter |
0 |
|
|
other |
1 |
|
time since last donor visit |
< 8 months |
3 |
|
|
8 to 21 months |
2 |
|
|
22 to 35 months |
1 |
|
|
> 35 months |
0 |
|
gender AND number of whole blood donations in the past 2 years |
male |
0 |
|
|
female and 1 |
3 |
|
|
female and 3 |
2 |
|
|
female and 5 |
1 |
|
|
female and 7 |
0 |
where:
• The delta hemoglobin has gaps in its point assignment. In the implementation the points were assigned as: points = (delta) + 2.5
• Female and 2, 4, or 6 donations in the past 2 years is not assigned points. In the implementation assigned points between the ones shown.
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: -3
• maximum score: 26
• The higher the score the more
|
Total Score |
Risk of Low Hemoglobin |
|---|---|
|
< 20 |
1% |
|
20 |
1% |
|
20.5 |
2% |
|
21 |
3% |
|
21.5 |
4% |
|
22 |
7% |
|
22.5 |
10% |
|
23 |
16% |
|
23.5 |
24% |
|
24 |
34% |
Specialty: Clinical Laboratory
