Yes.. please do not go ahead with transferring your last blastocyst without establishing the root cause for the past failures.
Its heart wrenching to go through cycle after cycle without knowing the exact reason for the failures.
After going through rough patches for my ttcing journey since 2010, i have learnt to take more control over my recent ivf cyles as I am no longer young. dr cheng is definitely open to discussions on your suggestions.
Dr Cheng also recommended me Dr Koh from Mt E Orchard too. I saw Dr Koh for my acute Rheumatism a few years ago but I had my reservations when I saw him this time round.
I had a friend with Lupus and she recommended me Dr Shiela Vasoo who got her pregnant. I subsequently went to Dr Shiela and introduced another friend of mine with Dr Cheng to Dr Shiela and she got pregnant with twins under the care of Dr Shiela too.
Below are the tests which I did with Dr Sheila :-
Thyriod - T4, TSH, Thyroid peroxidase Antibodies - (TPO), thyrotropin receptor antibodies (TRAbs) and thyroglobulin antibodies (TGAb).
Liver Profiles - AST/SGOT & ALT/SGPT
Special Protein Studies - C3 & C4
Serology - ANA Screen, Anti-ds DNA & Index
Lupus Screening & Pupus Anticoagulant
Anti-Cardiolipin 1GG & IGM screening
With my hyperthyroidism, my T4, TSH & TrAB were within Normal Range but my TGaB & one of the Anti-Cardiolipin indicator were slightly elevated. I wasn't in time to do my NK Cells tests but Dr Shiela mentioned that the prednisolone she prescribed me would be able to counter any minor NK cells within my body.
Given my T4, TSH results, any IVF dr will claim that I will have no issues with my thyroid antibodies and I am not at all surprise as IVF drs are reproductive endocrinologists and immunology is not their forte. Therefore I decide to follow on seeing Dr Sheila Vasoo who specializes in immunologic sub-fertility.
Yes I spoke to Dr Cheng on Endo scratch too and he gave the same reply too but with multiple implantation failures, try to suggest to him that you want to do the endo-scratch for the next round. I am sure he is pretty open with the endo-scratch or other FET protocols given your history.
Meanwhile stay positive... and press on ! ...