This is an HTML version of an attachment to the Official Information request 'Ct value of Covid-19 testing in New Zealand'.





 
 
133 Molesworth Street 
PO Box 5013 
Wellington 6140 
New Zealand 
T+64 4 496 2000 
 
Virginia Crawford 
 
 
By email: 
[FYI request #14341 email] 
Ref: 
 
H202009431 
 
 
Dear Virginia Crawford 
 
Response to your request for official information 
 
Thank you for your request under the Official Information Act 1982 (the Act) on 11 December 
2020 for: 
 
“I understand that the cycle threshold referred to in FYI 
https://scanmail.trustwave.com/?c=15517&d=mLDe39D1gIizcrOjA__T_T9odgk9_ppViW
JbuOyU6w&u=https%3a%2f%2ffyi%2eorg%2enz%2frequest%2f14173-amplification-
factor-being-used-when-determining-test-results-for-the-covid-19-test-kits 
 
  
is 40. Can you confirm that this value (40) is used in processing ALL tests done in New 
Zealand?  
  
Could you explain why such a high value is being used?”
 
 
I can confirm that PCR assays for all COVID-19 tests run for 40 cycles in IANZ accredited New 
Zealand laboratories. This is stipulated by the manufacturer instructions who have performed 
extensive validation and verification of their assays. 
 
I trust this information fulfils your request. Under section 28(3) of the Act you have the right to 
ask the Ombudsman to review any decisions made under this request. The Ombudsman may 
be contacted by email at: [email address] or by calling 0800 802 602. 
 
Please note that this response, with your personal details removed, may be published on the 
Ministry of Health website at: www.health.govt.nz/about-ministry/information-
releases/responses-official-information-act-requests. 
 
 
Yours sincerely 
 
 
 
Dr Kelvin Watson 
Group Manager COVID-19 Immunisation, Testing and Supply 
COVID-19 Health System Response Directorate 


 
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