Each week, I asked Mater Pathology to test and send out two tubes of my blood, as follows:

• Receive Sample A directly from SNP and analyse it for MMA
• Send the remainder of Sample A to QHPS
• Receive Sample B from QHPS and analyse it for MMA
• Send the remainder of Sample B to Westmead

Also each week, I asked QHPS to test and send out two tubes of my blood, as follows:

• Receive Sample B directly from SNP and analyse it for MMA
• Send the remainder of Sample B to Mater Pathology
• Receive Sample A from Mater Pathology and analyse it for MMA
• Send the remainder of Sample A to Westmead

I asked Westmead to do the following:

• Analyse all samples, in a single batch, for MMA
• Store the samples; later tested for homocysteine and sent out to PaLMS

The sample exchange process, for acquiring MMA results, is shown in the following diagram:

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