Thanks for the additional information.
I think I may have previously answered you in relation to claims and laws on limitation periods which governs when you can make a claim.
In any event, i am not sure whether your cause of action would be as against the lab or the doctors who made the referrals. The lab would just be testing for what they were told to test. it is likely therefore that your cause of action would be as against the GP and whether they tested for the incorrect thing.
You have a three year period from the alleged breach to bring a claim. The exception to this being when you became aware of the negligence. You would therefore have to calculate when you became aware that something went wrong with your treatment.
The amount you claim is not a figure that is picked from the air unfortunately. This is calculated based on a medical report stating what was wrong with you and this is then compared to other persons with a similar injury and how much was awarded by the court then. As such, I would not be able to say what you may claim via this online medium.
If it is that you feel strongly that there were medical negligence, you are strongly recommended to visit a Solicitor who specializes in this area of the law. Your concern may require very specialist assistance and it is also time sensitive.
Hope I clarified things for you. Kindly let me know if I may be of further assistance.
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All the best