Hi Himanshu,
I am not clear on the HLA testing being done on the donor?
Yes HLA typing is a DNA test done on donor and patient before BMT.
HLA is small set of genes on chromosome 6 which in layman's langauge desides whethere the body cells are own or foreign. So if we get exact matching HLA doner the engrafting of new marow is very fast. So in a way we cheat better to patients body if HLA match is perfect. The success rate of BMT in perfectly matching HLA is almost double than less matching HLA at fraction of cost.
I am also not clear on you doing 20 tests for HLA typing in Mumbai?
Unlike medicine doctors prescription is not mandatory for tests so i was searching for all the labs in india, lab from mumbai was the closest because they have outlet in pune which was my workplace.
Are you referring to random donor selection and then getting their HLA tests done to check if their HLA matches with patient?
No not random even rich peoples will lose fortune like that. If you check an earlier link from blood journal in this thread, that shows the probability of finding perfect HLA match donor family (family of father and family of mother). So i decided to chess that study, had saved 2 lac rupee from two yrs of my job.
First i did this test for three of us baby me and my wife and got to know exactly what is this test.
Since we married in small group of people (cast) around 10lac population which i believe increases the possibility of finding match in extended family. I probably wouldn't have done it if we would have married in cosmopolitan environment.
Then secondly i did this test on about 12 of our first-second cousins because they are of my age and need less explanation to get samples from them. Their i got to know that me and my cousins are matching but none for my baby; but it established my faith in the study. Then i decided to go deeper with more systematic scientific approach and find out that our child got the HLA gene from my grandmother and my wife's grandfather (not thalassemia he got it from my grandmother and my wife's grandmother) Simultaneously i got a hold on spit sample easy to use sample collecting test and carryout another 80 odd tests. We found multiple relatives matching each other but it looks our baby is unfortunate enough, with only one family left for testing we are already working on plan C.
So if you do not have a matching sibling then there is prity good probability of finding a matching cousin.